Weakness in head-turning suggests injury to the contralateral spinal accessory nerve : a weak leftward turn is indicative of a weak right sternocleidomastoid muscle ( and thus right spinal accessory nerve injury ), while a weak rightward turn is indicative of a weak left sternocleidomastoid muscle ( and thus left spinal accessory nerve ).
42.
Weakness in head-turning suggests injury to the contralateral spinal accessory nerve : a weak leftward turn is indicative of a weak right sternocleidomastoid muscle ( and thus right spinal accessory nerve injury ), while a weak rightward turn is indicative of a weak left sternocleidomastoid muscle ( and thus left spinal accessory nerve ).
43.
On the lateral side of the vessels, the accessory nerve runs for a short distance before it pierces the Sternocleidomastoideus; and on the medial side of the external carotid, just below the hyoid bone, the internal branch of the superior laryngeal nerve may be seen; and, still more inferiorly, the external branch of the same nerve.
44.
The exact relation of the parts to one another in the jugular foramen is as follows : the inferior petrosal sinus lies medially and anteriorly with the meningeal branch of the ascending pharyngeal artery, and is directed obliquely downward and backward; the transverse sinus is situated at the lateral and back part of the foramen with a meningeal branch of the occipital artery, and between the two sinuses are the glossopharyngeal, vagus, and accessory nerves.
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