PRACTICAL ANATOMY. 



tlietic nerve. In the communications, then, between the pneumogastric and the 

 glosso-pharyngeal nerve, we see the connecting link between a mechanism 

 pumping air, under the direction of the vagus, and a territory to be constantly 



he 8th Pair of Nerves 



comprising the 

 9 th or Glosso-pharyngeal 

 IdV or Pneumogastric, 



or Spinal Accessory. 



FnmTctUri 



FIG. 293. EIGHTH PAIR OF CRANIAL NERVES. 



I. Jugular ganglion of ninth nerve. 2. Petrous ganglion of ninth nerve. 3. Ganglion of the vagus root. 

 4. Ganglion of the vagus trunk. 5. Medullary part of eleventh nerve. 6. Spinal part of eleventh 

 nerve. 7. Superior cardiac branch joining cardiac of sympathetic. S. Subclavian artery, on right 

 side, arch of the aorta, on left side of the body. 9. Foramen magnum, receiving spinal part of the 

 spinal accessory. IO. Jugular foramen, transmitting all three nerves ; also called the foramen lacerum 

 posterius. II. Branches to hypoglossal, sympathetic, cervical nerves. 12. Olivary body (in broken 

 line). 



ventilated the middle ear and Eustachian tube, a territory whose delicate 

 structures might be irreparably damaged, were not the sensory sentinel, the 

 tympanic plexus, there to regulate the ingress and egress of air. And note, too, 



