首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 187 毫秒
1.
卵巢大小及发育状况与牛腔前卵泡采集数量的关系   总被引：3，自引：1，他引：2  
用简单机械分离法处理了 12 7枚成年牛卵巢。结果显示 ,在外观正常的卵巢中 ,腔前卵泡的采集数量与卵巢的大小成正相关关系 ,而有无黄体与腔前卵泡的采集数量无明显关系 ;卵巢上不同大小的可见卵泡的数量和分布与腔前卵泡的采集量有关。卵巢上可见卵泡分布均衡 ,大、中、小卵泡均有分布 ,小卵泡不过多以及无大卵泡 ,但中、小卵泡较多的 ,无论是否有黄体存在 ,均可获得较多腔前卵泡。而卵巢表面脂肪化、卵巢充血、有弥散性片状黄体及幼稚卵巢的 ,则腔前卵泡分离很少或几乎分离不到  相似文献   

2.
The size of the ovary varies substantially among cattle. This variation may influence the potential of the ovary to produce follicles. In the present study, we examined whether a relationship exists between the weight of the ovary and the number of antral follicles >or=1 mm. Paired ovaries were obtained from Holstein x Japanese Black F1 heifers. Follicles were classified into three size categories (small: 1.0-<5.0 mm, medium: 5.0-<8.5 mm and large: >or=8.5 mm), and the number of follicles in each category was recorded. Large variations in the weight of ovaries and the number of follicles were observed among animals. Significant positive correlations (r>or=0.4, P<0.001) were found between the weight of intact ovaries and the number of follicles in all three categories for the ovary contralateral to CL (OCC) and in the small follicles for the ovary ipsilateral to CL (OIC). Significant positive correlations (r>0.4, P<0.0001) were also observed between the weight of ovaries devoid of CL and follicles and the number of small and medium follicles in both OIC and OCC, indicating that the correlation is not due to the increase in ovarian weight associated with the increase in follicular number. Paired ovaries contained a similar number of small and medium follicles, and significant positive correlations were observed between them (r>0.6, P<0.0001). There were significant positive correlations between the weight of OCC and the number of small and medium follicles in paired ovaries (r>0.4, P<0.0001). These results suggest that 1) the weight of an ovary reflects the potential of the ovary to produce antral follicles, and 2) a rough estimation of follicular population might be possible by using the weight of the ovary contralateral to CL in heifers.  相似文献   

3.
This study describes the morphological and morphometrical changes associated with prepubertal ovarian development in the Antarctic minke whale (Balaenoptera bonaerensis). Ovaries were harvested from 94 immature minke whales caught in the Antarctic Ocean during the summer feeding season (December-March). Notable differences in ovarian size and morphology were found among animals. Up to 10 folds difference in ovarian weight was found among prepubertal whales of similar body size. During the prepubertal period, ovaries grew slowly and approximately doubled their weight. The morphologies of right and left ovaries were almost identical while the growth of the ovary appears to occur preferentially on the right side. The most striking morphological feature was numerous small antral follicles less than 5 mm in diameter found in ovaries of younger immature whales. The occurrence of these ovaries was highest in whales less than 6 m long and gradually decreased as body length increased. In larger whales, the occurrence of ovaries with a smaller number of follicles up to 10 mm and thick tunica albuginea increased. Thus, the ovary of the Antarctic minke whale experiences bursts of small follicular development during the early prepubertal period before becoming a more developed ovary with fewer but larger follicles, and thick tunica albuginea.  相似文献   

4.
Vascular endothelial growth factor (VEGF) is an important angiogenic factor in the ovary, but the localization of VEGF in the ovary of neonatal animals is poorly understood. A clear understanding of the relationship between the formation of the thecal layer and the cell‐specific expression of the VEGF system during follicular development in the neonatal ovary is still lacking. Immature female Wistar‐Imamichi rats used in this study were killed by decapitation 5, 7, 9 and 11 days after birth, and their ovaries were removed and subjected to histological and immunohistochemical observation. The number of primordial follicles had decreased in the ovaries at day 11 compared with that at day 5. The number of secondary follicles significantly increased with age. In the morphological observation of secondary follicles, we found that the theca layer (70 µm in diameter of follicles) began to form at day 9 and was completely formed at day 11. An endothelial cell marker, CD31, VEGF and Flk‐1 were located in the stromal tissues in the ovaries on each day examined after birth. In particular, in the ovaries at day 9 and day 11, when the secondary follicles appeared, CD31, VEGF and Flk‐1 were expressed in the theca layer. Flt‐1 was expressed in the oocytes of the ovaries at day 5 and day 7, and the sites of its expression changed to stromal and thecal tissues at day 9 and day 11. In conclusion, we provide the first evidence that the theca layer of secondary follicles begin to form at day 9 after birth and that VEGF and Flk‐1 may be able to stimulate the differentiation of stromal‐interstitial cells into thecal cells and the formation of the thecal vasculature in the neonatal rat ovaries, suggesting that the VEGF system may be involved in the formation of the thecal layer and vasculature during folliculogenesis in the neonatal rat.  相似文献   

5.
We investigated the effects of twice-weekly follicular punctures of ovaries with or without corpus luteum (CL) on follicular and luteal dynamics. A cross-over design was used, with each cow (seven Japanese Black beef cows) being assigned to one of the three groups at 2-month intervals. Follicular punctures were performed twice weekly for three consecutive weeks until day 20 (oestrus = day 0). All visible follicles (diameter >3 mm) in the ovaries bearing CL (ipsilateral group) or those in the contralateral ovaries (contralateral group) were aspirated. As a control, all visible follicles in both ovaries were aspirated (bilateral group). Follicular development, CL formation and progesterone concentrations in each cow were monitored from days 0 to 30. Follicular growth profiles in the punctured ovaries during/after puncture treatment were similar, irrespective of the presence of follicles in the unpunctured ovary and the CL in the punctured or unpunctured ovaries. After puncture, two cows (28.6%) each in the ipsilateral and bilateral groups did not exhibit behavioural oestrus until day 30, whereas all cows in the contralateral group exhibited oestrus. CL growth and increase in progesterone concentrations after the last follicular puncture in the bilateral group were delayed when compared with those in the ipsilateral group. Our results indicate that the presence of follicles in the unpunctured ovary and the CL in the punctured or unpunctured ovaries does not significantly influence follicular growth in punctured ovaries during/after puncture treatment. However, follicular puncture in ovaries bearing CL may disturb or delay oestrus occurrence after treatment.  相似文献   

6.
We hypothesized that the number of microscopic follicles present in the ovaries of cattle selected for twin births (Twinner) would be greater than in the ovaries of contemporary Controls. Ovaries were collected from seven Control and seven Twinner cows at slaughter. The number of Small (1 to 3.9 mm), Medium (4 to 7.9), and Large (> 8 mm) surface follicles was counted and one ovary was fixed for histological evaluation. Fifty to sixty consecutive 6-microm slices were taken from a piece of cortical tissue, approximately 1 cm x 1 cm in area, located between the surface follicles. Microscopic follicles were classified as primordial (oocyte surrounded by a single layer of squamous pregranulosa cells), primary (oocyte surrounded by a single layer of one or more cuboidal granulosa cells), secondary (oocyte surrounded by two or more layers of granulosa cells), or tertiary (oocyte surrounded by multiple layers of granulosa cells with initiation of antrum formation to < or = 1 mm in diameter). The total number of follicles was counted in 200 fields (2 mm x 2 mm) per ovary. A field containing no follicles was classified as empty. There were significantly more secondary follicles in Twinner compared with Control ovaries (12.9 vs 6.3; P < .05). Twinners also tended to have more small surface follicles (35.4 vs 49.0; P < 0.1). We conclude that ovaries of Control and Twinner cows do not differ in the number of primordial follicles or in the number of follicles activated into the growing pool; however, Twinner cows are able to maintain more growing follicles at the secondary and subsequent stages of development.  相似文献   

7.
The weight, length, width and volume of ovaries were determined as well as the number of follicles visible on the surface in relation to the presence of corpus luteum on the ovary in autumn period after Cloprostenol application. The ovaries of 43 sheep of the Tsigai breed were examined at the age of 2--4 years. The animals were divided into five groups. First group (I) was the control (n = 6). In the luteal phase of sexual cycle the animals of groups II to V were applied i. m. 125 micrograms of cloprostenol in Oestrophan inf. Spofa preparation. According to groups II (n = 8), III (n = 10), IV (n = 9), V (n = 10) the animals were killed at intervals of 24, 48, 72 and 120 hours (h) from the preparation application. The removed ovaries were fixed in 10% neutral formalin; after a 48-hour fixation they were weighed and their length and width were measured. Tertiary follicles visible on the surface were counted and measured. In group I we demonstrated the significantly higher weight of ovaries with corpus luteum (CL) as compared with ovaries without CL (P less than 0.001). The weight of ovaries with CL dropped significantly within 48 hours after cloprostenol application as compared with control (P less than 0.001) and the difference in the ovary weight according to CL incidence disappeared almost completely. In comparison with groups III and IV, the weight of ovaries in ewes of group V increased statistically significantly (P less than 0.01) on 5th day from the cloprostenol application. This finding is a result of development of new CL after a passed ovulation. The alterations in length, width and volume of ovaries were not so significant as those in weight. The number of surface follicles was very variable and the changes were not significant. The changes in the average size of follicles larger than 1 mm and of the largest follicles have shown that both parameters achieved significantly higher values in ovaries of the control group with present CL in comparison with ovaries without CL. The reduction of surface follicles after cloprostenol application seems to be connected with a possible operation on contractile structures of the external theca folliculi.  相似文献   

8.
Epidermal growth factor (EGF) is one of the important regulatory factors of EGF family. EGF has been indicated to effectively inhibit the apoptosis of follicular cells, to promote the proliferation of granulosa cells and the maturation of oocytes, and to induce ovulation process via binding to epidermal growth factor receptor (EGFR). However, little is known about the distribution and expression of EGF and EGFR in cattle ovary especially during oestrous cycle. In this study, the localization and expression rule of EGF and EGFR in cattle ovaries of follicular phase and luteal phase at different time points in oestrous cycle were investigated by using IHC and real-time qPCR. The results showed that EGF and EGFR in cattle ovary were mainly expressed in granulosa cells, cumulus cells, oocytes, zona pellucida, follicular fluid and theca folliculi externa of follicles. The protein and mRNA expression of EGF/EGFR in follicles changed regularly with the follicular growth wave both in follicular and in luteal phase ovaries. In follicular phase ovaries, the protein expression of EGF and EGFR was higher in antral follicles than that of those in other follicles during follicular growth stage, and the mRNA expression of EGFR was also increased in stage of dominant follicle selection. However, in luteal phase ovaries, the growth of follicles was impeded during corpus luteum development under the action of progesterone secreted by granular lutein cell. The mRNA and protein expressions of EGF and EGFR in ovarian follicles during oestrous cycle indicate that they play a role in promoting follicular development in follicular growth waves and mediating the selection process of dominant follicles.  相似文献   

9.
Ultrasonography has become indispensable in the control of equine reproduction. Mare ovary layers are inverted with respect to other species, with the follicles and corpus luteum found inside the ovary; only large follicles protrude from the organ's surface. This renders the making of diagnoses via rectal palpation of the ovaries very difficult. Ultrasound imaging, however, provides another avenue of examination. Since its first use in 1980, the diagnostic potential of ultrasonography has greatly improved. Colour Doppler ultrasonography can even asses blood flow, allowing for much better monitoring of ovarian activity. This study discusses the use of ultrasound, and in particular colour Doppler ultrasonography, in the monitoring of mare ovarian function and disease.  相似文献   

10.
A three-dimensional internal structure microscopy (3D-ISM) can clarify the anatomical arrangement of internal structures of equine ovaries. In this study, morphological changes of the equine ovary over the first 12 months of life were investigated by 3D-ISM in 59 fillies and by histological analysis in 2 fillies. The weight and volume of the paired ovaries initially decreased from 0 to 1 months to 2 to 3 months of age and then significantly increased at 8 to 12 months of age. The ovulation fossa was first observed around the 3rd month and became evident after the 6th month. The number of follicles with a diameter of ≥10 mm and the diameter of the largest follicle increased gradually after 6 months of age. On a volume basis, the medulla accounted for nearly 90% of the whole ovary at 0 to 1 months of age, but significantly decreased from 2 to 3 months of age. The volume of the cortex increased progressively after birth and reached approximately 60% of the total volume at 8 to 12 months of age. This significant development of the cortex coincided with the increased number and size of large follicles observed from 6 months of age. These results suggest that the development of the cortex plays a role in the maturation of the follicles and the equine ovary undergoes substantial morphological changes postnatally until puberty.  相似文献   

11.
Growth differentiation factor-9 (GDF-9) and bone morphogenetic proteins (BMPs), comprise the largest subgroups of ligands in the TGF-β superfamily, and have been shown to be involved in follicle development in mammals. However, whether these factors are involved in folliculogenesis in pigs is still unknown. The present study was performed to determine the relationships between early folliculogenesis and the expression of GDF-9 and BMP (BMP-4, -5 and -6) mRNAs in neonatal pigs. Ovaries were removed at 5, 16, 28 and 39 days after birth to examine the follicular population (the right ovary of each animal) and to detect mRNA expression (the left ovary of each animal). Primordial follicles accounted for >80% of the ovarian follicles from 5 days until 39 days after birth. A marked increase in primary follicles and the appearance of secondary follicles were observed in the ovaries at 28 days after birth. BMP-4, -5, and -6 and GDF-9 mRNAs were expressed by ovaries at 5-, 16-, 28- and 39-day-old pigs. The peak expression of BMP-4, -5, and -6 and GDF-9 mRNAs was observed in the ovaries at 5, 39, 28 and 16 days, respectively, after birth. These data demonstrate that folliculogenesis in piglets might be controlled by the interaction with these factors. We conclude that BMPs and GDF-9 may have distinct functions in several stages of follicle development in neonatal pig ovaries.  相似文献   

12.
The purpose of the present study was to investigate the development of follicles and incidence of apoptosis in vitrified neonatal mouse ovaries cultured in vitro in the presence of leukemia inhibitory factor (LIF). The vitrified and non-vitrified ovaries of 1-week-old mouse were cultured in the presence or absence of LIF for 7 days. At the beginning and at the end of culture period in each ovary of all groups of study the mean area and the development of ovarian follicles were analyzed; moreover, the incidence of apoptosis was assessed by transmission electron microscopy, terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end-labeling (TUNEL) method, DNA laddering and caspase-3/7 activity technique. The hormonal assay was done on the conditioned media collected during culture period. The proportion of preantral follicles and the levels of hormones increased in all cultured groups and it was significantly higher in LIF treated groups than in their control (P < 0.001). The ultrastructural characteristics of cell death, DNA fragmentation and TUNEL positive signals were prominent in vitrified cultured ovaries. The level of caspase-3/7 activity was higher in vitrified cultured ovaries.  相似文献   

13.
研究休情期银黑狐卵巢形态和卵泡的显微结构,以揭示银黑狐卵巢发育的一般规律。本试验于2012年12月份采集5只健康一岁龄银黑狐卵巢10枚,用游标卡尺测量其长、宽、厚,用电子天平测量其重量,并对其表面可见卵泡数量进行统计,然后利用光学显微镜对各级卵泡分别观察1~3个,共计原始卵泡30个,初级卵泡20个,次级卵泡15个,三级卵泡12个,成熟卵泡10个,并进行拍照。结果表明:随银黑狐卵巢体积不断增大,其中80%的卵巢重量也随之增大;可见卵泡数量与卵巢体积及重量没有相关性;卵巢由被膜、皮质和髓质构成,髓质位于卵巢内层,分布着较多血管,皮质位于卵巢外层,内有不同发育阶段的卵泡;原始卵泡由卵母细胞和颗粒细胞构成,初级卵泡开始出现透明带物质,到次级卵泡阶段发育完整,三级卵泡出现卵泡腔,卵泡及卵母细胞直径在有腔卵泡阶段比腔前卵泡阶段增长速度快,成熟卵泡的直径及透明带厚度达到最大,各级卵泡均有闭锁现象。  相似文献   

14.
This study was designed to reveal the FSHR mRNA and protein expression in the neonatal porcine ovary and to determine whether maternal administration of antiandrogen flutamide may affect FSHR expression in the ovary of newborn piglets using real‐time PCR, immunohistochemistry and Western blot analysis. Pregnant sows were injected with flutamide at a dose of 50 mg/kg body weight, given five times, every second day, starting at day 20 post‐coitum (p.c.) or day 80 p.c., and ovaries were obtained from neonatal pigs. The FSHR mRNA expression was significantly decreased after flutamide administration. Furthermore, higher down‐regulation was observed following exposure to antiandrogen at day 20 than at day 80 p.c. Immunohistochemistry showed the positive immunostaining for FSHR in the oocytes, granulosa cells of primary follicles and the surface epithelium of the ovaries from both control and flutamide‐treated pigs. However, oocytes and granulosa cells of primary follicles in the ovaries exposed in utero to flutamide were weakly immunostained when compared to those in the control ones. The presence of FSHR protein in all investigated ovaries was confirmed by Western blot analysis. Based on our findings, we suggest that FSHR may be involved in the early follicle formation in pigs, which begins during prenatal life. Furthermore, the regulation of FSHR mRNA and protein expression in neonatal porcine ovaries after maternal exposure to flutamide confirms that androgens play a crucial role in porcine folliculogenesis at the early stages.  相似文献   

15.
The purpose of this experiment was to determine the ovulation rate after treatment with human chorionic gonadotropin (hCG) in two groups of gilts characterized by different ovarian morphology: grape-type (GT; n = 11) and honeycomb-type (HT; n = 7). At 170 d of age (d 0), gilts were examined by laparoscopy and ovarian type was determined by the distribution of macroscopic follicles present on the ovarian surface. Five to ten minutes after surgery, each gilt received a single injection (i.m.) of 750 IU of hCG. At d 0, GT ovaries had a greater number of large follicles (greater than or equal to 6 mm) than HT ovaries (10.0 +/- .5 vs 2.6 +/- .3; P less than .05), whereas HT ovaries had more small follicles (1 to 3 mm; HT: 42.3 +/- .8 vs GT: 26.7 +/- .9; P less than .05) and total follicles (HT: 59.4 +/- 2.3 vs GT: 52.2 +/- 1.5; P less than .05), although numbers of medium follicles (4 to 5 mm) were similar (GT: 15.6 +/- .8 vs HT: 14.6 +/- 1.7; P greater than .10). Number of induced corpora lutea (CL) per ovary was greater (P less than .05) in gilts with GT ovaries (10.59 +/- 2.9 CL) than in gilts with HT ovaries (5.21 +/- .66 CL). Total weight of luteal tissue (LT) per ovary and serum progesterone concentrations 8 d after induction of ovulation were greater in GT gilts than in HT gilts (GT: 6.37 +/- 1.09 g vs HT: 3.31 +/- .49 g for LT, P less than .05; GT: 21.08 +/- 4.76 ng/ml vs HT: 13.40 +/- 2.05 ng/ml for progesterone, P less than .07).(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

16.
Changes in follicular development of the ovary at 105, 140 and 175 d of age were observed on 48 prepuberal Yorkshire and Hampshire gilts raised on two planes of nutrition. The follicles from the left ovary were counted and measured by histological techniques. Both the nonatretic and the atretic (more than four pyknotic bodies) antral follicles were classified into six categories according to size, and each category was expressed as percentage of the total number. The proportion of nonatretic follicles belonging to the first category (.19 to .36 mm in diameter) was higher in Hampshire than Yorkshire gilts at d 105 (65.4 vs 47.6%; P less than .05), but not at d 140 and 175. The proportion of atretic follicles to the total number observed was higher in Yorkshire at d 175 than at d 140 and 105 (38.6 vs 21.9 vs 11.6%, respectively; P less than .05), whereas in Hampshire, significant differences were observed only between d 140 and 105 (25.2 vs 3.9%, respectively). The low-plane regimen reduced the percentage of nonatretic follicles of the third (.63 to 1.12 mm) and fourth (1.13 to 2.00 mm) categories in Yorkshire gilts from 14.4 and 7.2% to 9.7 and 4.0%, respectively (P less than .05). According to grouping, size and number of antral follicles, three morphological types of ovaries could be distinguished: honey-comb, grape-like and an intermediate class. Reanalyzing the data accounting for types resulted in radical reduction in the residual variation, hence many significant differences between the two breeds could be identified. At 140 and 175 d of age, Hampshires with honey-comb- and grape-like ovaries had greater numbers of medium and large follicles than Yorkshires (P less than .001). It is concluded that the slower follicular development observed at 105 d of age in Hampshire, as compared with Yorkshire gilts, allows accumulation of greater numbers of antral follicles at 140 and 175 d for both morphological types of ovaries.  相似文献   

17.
Ovarian morphology and follicular systems in yaks of different ages   总被引：5，自引：0，他引：5  
Forty-five female yaks of different ages with known reproductive histories were used to determine the morphology and follicular systems of their ovaries. The histological structure of the ovaries in each age group was found to be similar and resembled that of cattle and buffalo. The atresia of primordial follicles took one form (oocyte atresia); that of growing follicles could be divided into two stages (early and late); and that of Graafian follicular were classified as early, definite and late stage. The details of the several types of atresia are described herein. The average total numbers of primordial follicles per ovary pair in 1-month-old calves, 1-year-old heifers, 2-year-old heifers and 7-10-year-old cows were 53,500 +/- 6300, 32,870 +/- 4500, 22,850 +/- 2800 and 9500 +/- 1200, respectively; those of growing follicles were 210 +/- 76, 815 +/- 95, 895 +/- 142 and 445 +/- 88, respectively; and those of Graafian follicles were 36.5 +/- 14.2, 41.7 +/- 12.3, 37.8 +/- 9.8 and 42.5 +/- 14.5, respectively. The percentage of atretic primordial follicles per ovary pair in 1-month-old calves, 1-year-old heifers, 2-year-old heifers and 7 to 10 year-old cows were 51.6, 55.5, 56.7 and 47.4%, respectively. The average total numbers of atretic growing follicles per ovary pair were 119.5 +/- 21.5, 605.5 +/- 74.3, 721.6 +/- 78.5 and 275.8 +/- 66.3, respectively; those of atretic Graafian follicles were 22.1 +/- 5.6, 21.2 +/- 7.6, 21.5 +/- 4.7 and 25.3 +/- 6.7, respectively.  相似文献   

18.
A 21 year old thoroughbred mare with granulosa theca cell tumor (GTCT) in the right side and atrophic contralateral ovary was investigated in this study. After arrival at our laboratory on 10th December 1999, the clinical diagnosis of GTCT was examined by rectal palpation and ultrasonographic image of ovaries. Plasma from peripheral blood was collected in the breeding and non-breeding seasons for hormonal analysis. The results showed that the contralateral ovary regained normal activity without any treatment of the GTCT affected ovary and contained follicles showing different sizes 19 months later. However, the affected right ovary, which became smaller after 4 months, was totally inactive without any follicle. The observations clearly demonstrate that without any treatment of the GTCT affected ovary, a mare can return to her normal estrous cycle within a certain period in some GTCT cases.  相似文献   

19.
In order to investigate the possibility of predicting the recovery rate of oocytes for use in a sperm-zona pellucida binding assay, ovaries were obtained from 67 bitches of 37 different breeds, and cumulus-oocyte complexes (COCs) were recovered by mincing the ovaries with a scalpel. The mean number of COCs recovered was 37.2 +/- 34.1 (range 0-145) per ovary. Age significantly affected COC recovery rates. From bitches 1-6 years old, 54.2 +/- 35.1 COCs/ovary were recovered, compared to 26.4 +/- 29.0 from bitches 7-13 years old (P = 0.003). The morphology of the uterus or the presence or absence of ovarian structures had no significant effect on COC recovery rates, although there was a tendency for more COCs to be recovered from ovaries with only follicles visible on the surface. There were no significant correlations between body weight or ovarian weight and COC recovery rates. There was a high correlation in the COC recovery rate between the two ovaries of a bitch, enabling an approximate estimation of the COC recovery rate from the second ovary when the COCs from the first ovary have been recovered. The large variation in COC recovery rates between bitches stresses the need for storage of canine oocytes in order to secure a high enough number of oocytes for a homologous sperm-zona pellucida binding assay in the dog.  相似文献   

20.
研究采用大体解剖法、石蜡切片法、HE染色法等对20只产蛋期的皖西白鹅母鹅生殖系统的形态结构和组织结构进行了观察,结果如下:皖西白鹅母鹅的生殖系统包括卵巢和输卵管两部分,仅左侧发育正常,右侧早已退化,卵巢表面被覆生殖上皮,下方是白膜,其实质由皮质和髓质组成,皮质内含有不同发育阶段的卵泡和萎缩卵泡,大卵泡突出了卵巢表面,卵泡无卵泡腔,也无卵泡液,排卵后不形成黄体。输卵管分为漏斗部、蛋白分泌部、峡部、子宫部和阴道部5个部分,各段均由黏膜层、肌层和外膜构成,黏膜上皮有纤毛,固有层内有腺体和淋巴组织,无黏膜肌层,肌层由内环外纵两层平滑肌组成,外膜为浆膜。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号