DISSECTING MANUAL. 



is large and fusiform. It communicates with the superior cer- 

 vical ganglion, hypoglossal, loop between the first and second 

 cervical, and spinal accessory (accessory part). Branches: 

 The pharyngeal descends between carotids to the side of the 

 pharynx, and there joins pharyngeal branches of the glosso- 

 pharyngeal and superior cervical ganglion of the sympathetic 

 in a plexus (pharyngeal plexus) ; this supplies the muscles of the 

 pharynx and soft "palate, except the Stylo-pharyngeus and 

 Tensor palati, and sends a (lingual) branch to the hypo- 

 glossal. The superior laryngeal descends behind the carotids 

 and divides into two branches, viz.: external laryngeal, de- 

 scending upon the Inferior constrictor and supplying it and 

 the Crico- thyroid ; and internal lary/igeal, running between 

 the Middle and Inferior constrictor, and through the thyro- 

 hyoid membrane to supply the laryngeal mucosa and commu- 

 nicate with the inferior laryngeal. [692] 



Spinal Accessory. This consists of tw r o essentially separate 

 parts, spinal and accessory, of different origin and different 

 distribution; they unite at the foramen magnum and tra- 

 verse the jugular foramen in the same dural compartment as 

 the vagus. In the foramen the accessory portion sends a small 

 branch to the root ganglion of the vagus, and then partially 

 joins the trunk ganglion of the vagus, and partially the vagus 

 itself beyond the ganglion. The spinal portion emerges from 

 the jugular foramen and descends between the internal carot- 

 id and internal jugular; then passing over the vein and under 

 the Sterno-mastoid, it pierces and supplies the latter and runs 

 across the posterior triangle to enter the under surface of the 

 Trapezius. It communicates with the Sterno-mastoid branch 

 of the second cervical in or under that muscle; with the third 

 and fourth cervical in the posterior triangle; and with the 

 branches of the third and fourth cervical to the Trapezius 

 under that muscle. [695] 



Hypoglossal. Emerging from the anterior condyloid fora- 

 men, this descends on the outer side of the internal carotid, 



[76] 



