The Carnial Muscles Of Vertebrates PDF Download

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ... innervating them, must be, in general, true for the terminal buds and the nerves that innervate them. The nerve hillocks, or sense organs of the lateral line, are said by Beard (No. 10, p. 209) and Wilson (No. 131, p. 244) to arise separately and independently along lines of sensory epithelium that either differentiate in one or more directions from certain central points, or grow directly from such points by cell division. From the deeper layers of this sensory epithelium the nerve supplying the organs of the line arises. Terminal buds and the nerves innervating them should therefore arise in this same way. The only nerves in Amia from which I have been able to trace branches definitely to terminal buds are the ophthalmicus superficialis trigemini and the maxillaris inferior trigemini. The former of these two nerves in 14 mm. specimens derives the larger part, if not all, of its fibres from the median part of the trigemino-facial ganglion, that is, from that part of the ganglion that is formed on, or in connection with, the fasciculus communis root. From this same part of the ganglion a large bundle of fibres is sent to the truncus maxillaris trigemini; from it arises also the ramus palatinus facialis, which is distributed in Amia to a region covered with terminal buds, and which in Rana innervates such buds (No. 121, pp. 121 and 123); and from it also a bundle of fibres is possibly sent to the truncus hyoideo-mandibularis facialis, as is said to be the case in Rana and Amblystoma, in which animals it gives origin, according to Strong, to the ramus mandibularis internus facialis, which nerve in Rana innervates terminal buds (No. 121, pp. 130, 132, and 195). I was unable to definitely trace this bundle of fibres in Amia into the truncus...