Surgical therapeutics and operative technique . Fig. 289.—Exposure and Section of Mastoid Branches of the Spinal Nerve:View of Field of Operation. Dissection of the posterior aspect of the sterno-cleido-mastoid muscle, the posteriorborder of which is raised, together with the skin, by the forceps. The branchof the spinal accessory nerve is held in the jaws of the forceps. Second Stage.—-Dissection of the posterior border of the muscle, which isfirmly drawn forwards with one or two forceps. This artifice places themastoid branches of the spinal accessory nerve on the stretch. Third Stage.—The p
Surgical therapeutics and operative technique . Fig. 289.—Exposure and Section of Mastoid Branches of the Spinal Nerve:View of Field of Operation. Dissection of the posterior aspect of the sterno-cleido-mastoid muscle, the posteriorborder of which is raised, together with the skin, by the forceps. The branchof the spinal accessory nerve is held in the jaws of the forceps. Second Stage.—-Dissection of the posterior border of the muscle, which isfirmly drawn forwards with one or two forceps. This artifice places themastoid branches of the spinal accessory nerve on the stretch. Third Stage.—The posterior surface of the muscle is laid bare in passingupwards towards the origin of the spinal accessory nerve, the external OPERATIONS ON THE NECK 173 branches of which are divided in succession, from below upwards, at theirentrance into the substance of the sterno-mastoid muscle. We can thendissect the trunk of the nerve very high up in the neck, and remove a certainportion of its length with the mastoid branches. Fourth Stage.—Toile
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