THE CRANIAL NERVES. 



383 



II. The optic or second cranial nerve will be considered in 

 the section dealing with the development of the eye, p. 387. 



xnv 



FIG. 154. The brain of an adult Rabbit from the ventral surface. The 

 greater part of the left temporal lobe has been sliced off' horizontally. 

 The planes of the three semicircular canals of the left side are indicated 

 by the thick lines surrounding the floccular lobe of the cerebellum. 

 (From Marshall and Hurst.) x 2. 



CC, crus cerebri. CG, corpus genieulatum. D, descending coriui of left lateral 

 ventricle. H, hippocampus major. LF, floccular lobe of cerebellum. LL, lateral lobe 

 of cerebellum. OC, optic chiasina. OT, optic tract. P, pituitary body. PV, pons 

 Varolii. SA. anterior vertical semicircular canal. STT. horizontal semicircular canal. 

 SP, posterior vertical semicircular canal. T, temporal lobe of cerebral hemisphere. 



I, olfactory lobe, with roots of olfactory nerves. II, optic nerve. Ill, third nerve or 

 motor oculi. "IV, fourth nerve. V, trigeminal nerve. VI, sixtli nerve or abducens. 

 VII. facial nerve. VIII, auditory nerve. IX, glosso-pharyngeal nerve. X, pnemno- 

 gastric nerve. XI, spinal accessory nerve. XII, hypoglossal nerve. 



Ill, IV, and VI. The third, fourth, and sixth cranial nerves. 

 There are no exact observations recorded 011 the development of 



