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Each nerve trunk is composed of a variable number of different sized bundle (funiculi) of nerve fibers which have a special sheath (perineurium) The funiculi are enclosed in a firm fibrous sheath (epineurium); this sheath also send in processes of connective tissue which connect the bundles together. In the funiculi between the fibers is a delicate supporting tissue ( the endoneurium). Shown is a transverse section of the sciatic nerve of a cat. It consists of bundles (Funiculi) of nerve fibers ensheathed in a fibrous supporting capsule, epineurium, A; each bundle has a special sheath ( not sufficiently marked out from the epineurium in the figure) or perineurium B; the nerve fibers N f are separated from one another by endoneurium; L, lymph spaces; Ar, artery; V, vein; F, fat.

Nerve Trunk

Each nerve trunk is composed of a variable number of different sized bundle (funiculi) of nerve fibers…

Development of the spinal nerves. A, Formation of nerve roots. B, Formation of nerve trunk (N).C, Formation of nerves. D, E, Formation of subordinate branches. F, Formation of nerve trunks in relation to the limb: dorsal and ventral trunks corresponding to lateral and anterior trunks in D and E. Labels: D.R., dorsal root; A1.C., alimentary canal; V.R., ventral root; Ao, aorta; N.T., neural tube; V., cardinal vein; No., notochord, M.P., muscle plate; D.G., dorsal ganglion; Sy., sympathetic cord; W.D., wolffian duct; Co., coelom; So., somatic division; V1, visceral branch; P, posterior primary division; Lat, lateral branches; Ant., anterior branches.

Development of the Spinal Nerve

Development of the spinal nerves. A, Formation of nerve roots. B, Formation of nerve trunk (N).C, Formation…