. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SPINAL ACCESSORY NERVE. 749 dean region (la region hyoidienne superieure), where it terminates. The external branch passes downwards below the sterno-cleido- mastoid muscle to reach the trapezius, in which it is chiefly distributed.* Fig. From Sends, reduced one-half. A, part of cerebellum cut across; B, medulla ob- longata ; c, spinal chord; a, floor of fourth ventricule ; b, calamus scriptorius ; cc, posterior pyramidal bodies ; d, right restiforme body obliquely divided ; ff, lateral columns of spinal chord; h h
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SPINAL ACCESSORY NERVE. 749 dean region (la region hyoidienne superieure), where it terminates. The external branch passes downwards below the sterno-cleido- mastoid muscle to reach the trapezius, in which it is chiefly distributed.* Fig. From Sends, reduced one-half. A, part of cerebellum cut across; B, medulla ob- longata ; c, spinal chord; a, floor of fourth ventricule ; b, calamus scriptorius ; cc, posterior pyramidal bodies ; d, right restiforme body obliquely divided ; ff, lateral columns of spinal chord; h h, posterior columns of spinal chord; i, posterior longitudinal fissure ; k ft, posterior roots of spinal nerves; 3 3, roots of vagus nerve; 44, roots of glosso-pharyngeal; 555, roots of nervus accessorius; 6, ganglion of the root of the vagus or superior ganglion; 7, auricular branch of vagus; 8, right ganglion petrosum of glosso-pharyngeal; 9, ramus anastomicus of Jacob- son ; 10, communicating branch between the superior ganglion of the vagus and the ganglion petrosum; 11, roots of the accessory which form its internal branch; 12, roots of the accessory which form its external branch ; 13, glosso-pharyngeal nerve; 14, trunk of the vagus ; 15, pharyngeal branch of vagus ; 16, filaments of this branch that come from the vagus; 17, filaments of this branch that come from the internal branch of the accessory; 18, ganglion of the trunk of the vagus or inferior ganglion; 19, nervus laryngeus superior; 22 22, communicating branches between the ganglion of the trunk of the vagus and the superior ganglion of the sympathetic; 23, fibres of the internal branch of the accessoiy which do not enter into the for- mation of the ganglion of the trunk of the vagus ; 24, branch from these fibres which joins itself to the external branch of the superior lan'tigeal nerve. Physiology of the accessory.— The peculiar origin and course of this nerve, and particularly its intimate connection with t
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