| Abstract: | This is a study of the origin, formation, course, distribution, the fascicular number, their area and arrangement, total fibre count, density and diameterspectra of the accessory nerve in the Indian buffalo. The radices spinales are located from the level of C1 to midlevel of C6cord segments. The radices craniales arise in series from the medulla oblongata caudal to those of the vagus nerve. The accessory nerve contains 7931 myelinated fibres arranged in 31 fascicles. Of these 41 % have an external diameter of 10–12 μm. The greatest density of fibres viz. 1781/mm2 is obtained in the anastomosing ramus from the second cervical spinal nerve. The least value (377/mm2) is found in its ventral ramus. However, the dorsal ramus appears to have a larger cross-sectional area. |
