Neuromuscular junction (labels) - histology illustration

Muscular fibers of Lacerta viridis with the terminations of nerves. a. Seen in profile. P, P. The nerve end-plates. S, S. The base of the plate, consisting of a granular mass with nuclei. b. The same as seen in looking at a perfectly fresh fiber, the nervous ends being probably still excitable. (The forms of the variously divided plate can hardly be represented in a woodcut by sufficiently delicate and pale contours to reproduce correctly what is seen in nature.) c. The same as seen two hours after death from poisoning by curare.

Histology illustration courtesy of Gray's Anatomy.