HEAD AND ANTERIOR CERVICAL STRUCTURES. 57 



The Peripheral Nervous System, 786. (7689) 



In the brain laboratory, with the base of a brain, models, diagrams, and prepared sec- 

 tions at hand, the student should study the general description of each cranial nerve ; 

 the branches and distribution will be demonstrated on the subject as the dissection pro- 

 ceeds.. 



First or olfactory nerves, 788-9. (770-1-2) 

 Olfactory tract. Olfactory bulb. 

 Cortex of the tract. 

 External root, middle, internal root. 

 Optic nerves, 790-1. (772-3) 



Optic chiasma, or commissure. 



Constitution of the optic chiasma. 

 Uncrossed fibres. 

 Crossed fibres. 

 Commissural fibres. 

 Optic tract. 



Internal root. 

 External root. 



Optic radiation. Gudden's Commissure. Meynert's Commissure. 

 Third or oculo-motor nerve, 7912. (774 5) 

 Fourth or trochlear nerve, 793. (775-6) 

 Fifth or trigeminal nerve, 794-5. (776-7) 

 Portio major, ascending root. 

 Portio minor, nucleus, descending root. 

 Ascending root : 



Accessory sensory nucleus. 



Cerebellar root. 



Descending root : 



Motor nucleus. 



Gasserian ganglion. 



Sixth or abducent nerve, 805-6. (787-8) 

 Seventh or facial nerve, 806. (788-9) 

 Genu nervi facialis. 

 Pars intermedia of Wrisberg. 

 Geniculate ganglion. 

 Auditory nerve, 811-12-13. (792-3-4) 

 Lateral root. 

 Mesial root. 



Small-celled or chief nucleus. 

 Large-celled or Deiter's nucleus. 

 Accessory nucleus. 



Tuberculum acusticum. Nucleus funiculi teretis. Superior olive. 

 Lateral root : 



Conductor sonorus. 

 Mesial root. 



Glosso-pharyngeal nerve, 813. (794-5) 

 Small-celled nucleus. 

 Large-celled nucleus. 

 Ascending root. 

 Jugular ganglion. 

 Petrous ganglion. 



Pneumogastric, or vagus nerve, 815-16-17. (796-7) 

 Spinal accessory nerve, 81920. (800-1) 

 Hypoglossal nerve, 820-1. (801-2) 



Landmarks of the Back, 1170-1180. (1146-1156) 

 Median furrow. 

 Vertebral spines. 

 Thoracic spines. 

 5 



