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Show 1887.] ANATOMY OF HYDROMYS. 59 off the greater portion of the anterior thoracic nerve. The 6th nerve divides into two portions, an upper and lower. The combined cord formed by the 7th cervical and 1st dorsal also divides into two M.S. ID Cervical and brachial nerves. (Diagrammatic.) 1-7. Cervical nerves; LP. 1st dorsal nerve; Sp.Sc. Suprascapular; Sb.Sc. Subscapular; Cflx. Circumflex; M.C. Musculo-cutaneous; Tr. Nerve to triceps; M.Sp. Musculo-spiral; U. Ulnar; M. Median; Cu. Internal cutaneous ; Phr. Phrenic ; Th. Anterior thoracic ; M.M. Muscular branches. portions, an anterior and a posterior. The upper part of the sixth, having received the branch from the circumflex, joins the anterior part of 7 + 1 , and the combined trunk becomes musculo-spiral, having previously given off branches to the triceps and other muscles. The lower division of 6 joins the posterior of 7 + 1 , having first given off a filament which joins the anterior thoracic. The large trunk thus formed, having given off some muscular brauches, splits up into ulnar, median, and internal cutaneous. Lumbosacral Nerves (fig. 2).-The 1st lumbar forms the iliohypogastric and the 2nd the ilio-inguinal. These nerves are connected with one another by a communicating branch, but have no junction with those below. The 3rd gives off genito-crural, a branch of communication with 4, and in conjunction with a branch from this last forms external cutaneous. The remaining portion of 4 with a branch from 5 forms a common trunk which divides into obturator and anterior crural. The great sciatic is formed by the |
