. The anatomy of the domestic animals. Veterinary anatomy. THE SPINAL ACCESSORY NERVE 809 The medullary part arises from the lateral aspect of the medulla by several rootlets which are behind and in series wth those of the vagus (Fig. 629). The Spinal part arises from the cervical part of the spinal cord by a series of fasciculi which emerge between the dorsal and ventral roots. The bundles unite to form a trunk which is very small at its origin at the fifth segment of the cord, but increases in size when traced toward the brain, since it continually receives accessions of fibers. It passes th
. The anatomy of the domestic animals. Veterinary anatomy. THE SPINAL ACCESSORY NERVE 809 The medullary part arises from the lateral aspect of the medulla by several rootlets which are behind and in series wth those of the vagus (Fig. 629). The Spinal part arises from the cervical part of the spinal cord by a series of fasciculi which emerge between the dorsal and ventral roots. The bundles unite to form a trunk which is very small at its origin at the fifth segment of the cord, but increases in size when traced toward the brain, since it continually receives accessions of fibers. It passes through the foramen magnum and joins the medullary omo-hyoide Fig. 650.—Neck of Hobse, After Removal of Part of CuTANEns and Tbapezius. chiocephalicus: b, anterior superficial pectoral muscle; r, cervical eutaneus: d, sterno-cephaIi( /, sterno-thyro-hyoideus; g, trachea; h, h', h'\ tendoas of s , brachiocephalicus, and longissin : I, anterior deep pectoral muscle; m, rhomboideus cervicalis borders of which are indicated by dotted lines; p, parotid gland , spine of scapula; I, external maxillary vein; 2, S, jugular vein ?rvical artery; 6, cephalic vein; 7-11. ventral branches of second to ond cervical nerve; /.3, cervical branch of facial nerve: 74. terminal branches of dorsal divisions of cervical nerves; 15, dorsal branch of spinal accessory nerve. (After Ellenberger-Baum, Top. Anat. d. Pferdes.) atlantis; i, trapezius cervicalis; k, supraspinati n, serratus cervicis; o, splenius, upper and lowe g, parotido-auricularis muscle; r, wing of atlas; 4, carotid artery: 3, descending branch of inferior seventh cervical nerves; 13, cutaneous branch of si The trunk thus formed sends its medullary fibers to the vagus and glosso-pharyngeal nerves and emerges through the foramen lacerum posterius. It then runs backward and downward with the vagus in a fold of the guttural pouch, separates from that nerve, crosses the deep face of the mandibular gland and the occipital artery, and d
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