THE CEANLLL NERVES. 



383 



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

 the section dealing with the development of the e}^e, p. 387. 



Xll 



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

 o-reater 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, ems ccrcbri. CG, corpus srenieulatum. D, descending conm of left lateral 

 ventricle. H, hippodampaa major. LF, floccular lobeof cerebellum. LL,lateral lobe 

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

 Varolii. SA. anterior vertical semicircular canal. SH, horizontal semicircular c;i mil. 

 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, sixth nerve or abducens. 

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

 uastrie 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 on the development of 



