Nerve Trunk

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.

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