502 NEUROLOGY. 



diaphrS/gm, when the inferior branch terminates at the lesser 

 curvature of the stomach, in a plexus . which siends numerous, 

 branches to the right sac of that organ ; and the superior branch, 

 passing to the left of the cardiac orifice, becomes lost in the solar 

 •plexus. In passing it gives numerous twigs to the left sac of 

 the stomach, mingles its branches with those of the sympathetic 

 from the hepatic plexus, aad anastomoses with the terminal twigs 

 of the right nerve. 



ELEVENTH PAIR — SPINAL ACCESSORY. 



The eleventh is a nerve of motion, arising from the whole 

 extent of the cervical portion of the spinal cord, running along 

 between the roots of the spinal nerves, and after entering the 

 cranium by the foramen magnum, it receives additional filaments 

 from the medulla oblongata. It passes through the dura mater, 

 in company with the tenth pair, and leaves the cranium through 

 the foramen lacerum basis cranii. In the cranial cavity, it 

 receives twigs from the par vagum, and after emerging there- 

 from, is directed backwards under the superior extremity of the 

 submaxillary gland, and passing down the neck, gains the border 

 of the levator humeri muscle near the shoulder ; then mounting 

 slightly upwards, it crosses under the cervical trapezius, and is 

 lost in the dorsal trapezius and rhorciboideus brevis muscles. 



In its course it gives off numerous twigs to the superior 

 cervical ganglion, to the maxillary gland, and a large branch to 

 the stemo-maxillaris, levator humeri, and trapezius muscles, and 

 receives branches from the first, second, third, fourth, fifth, and 

 sometimes sixth cervical nerves. 



TWELFTH PAIR — HYPO-GLOSSAL. 

 This, a motor nerve, has its origin in numerous filaments 

 derived from the medulla oblongata. It makes its exit from the 

 cranium by the condyloid foramen of the occipital bone, descends 

 by the external face of the guttural pouch, and is distributed to 

 all the muscles of the tongue, after communicating with the first 

 ""^rvical nerve and superior cervical ganglion of the sympathetic. 



Spinal Nerves. 

 The nerves which emanate from the spinal cord, and make 

 their exit through the intervertebral foramina are collectively 



