446 SKIN AND CUTANEOUS SENSE ORGANS OP AMIURUS. 



PLATE I.— (Continued). 



Fig. 13. — Dorsal aspect of adult brain. 

 Fig. 14. — Ventral aspect of adult brain. 

 CH. — Cerebral hemispheres. 



LO. — Optic lobes. 



CB. — Cerebellum 



TA. — Tuberculum acusticum. 



LT. — Lobus trigemini. 



LV. — Lobus vagi. 



LI. — Lobus inferior. 



1, 2, 3, &c, indicate the planes of the sections of the brain num- 

 bered 1, 2, 3, &c. on Plate V. 



Olf. Tr.— Olfactory tract. 



N. II. . III. , IV., (be. — Optic, third, fourth nerves, &c. 



N. VIII. ant. and post. — R. ant. and post, of auditory nerves. 



N. sp. I. — 1st spinal nerve. 



R. lat. V. — Ramus lateralis trigemini. 



R. ot. — Ramus oticus. 



R. op. s. — Ramus ophthalmicus superiicialis. 



R. op. p. — Ramus ophthalmicus profundus. 



R. c. — Ramus ciliaris. 



R. max-mand. and fac. — R. maxillo-mandibularis and facial. 

 Fig. 15. — Lateral aspect of brain to show origin of nerves. Additional letter- 



ing: 



R. b. — Ramus buccalis. 



SL. — Supero-lateral strand of trigeminal complex. 



IM. — Infero-medial strand of trigeminal complex. 



G. IX.. G. X. — Ganglia of the glossopharyngeus and vagus re- 

 spectively. 

 Fig. 16. — Lateral aspect after removal of the Gasserian ganglion to show points 



of emergence of the roots of the fifth. 



Vag. I, — Anterior root of the vagus group. 

 Fig. 17.— Medial aspect of the Gasserian ganglion with its branches in situ. 



6 — Smaller dorsal branches of the trigeminal complex. 



