DESCRIPTION OF FIGURES. 295 



r. VII. p. t. — ramus pre-trematicus facialis. 



r. V. 2. to r. V. ^. — the ventral rami of the second to fourth spinal 

 nerves. 



rx. b. — radix brevis of ciliary ganglion. 



rx. I. — radix longa of ciliary ganglion. 



s . c. — subcranial canal. 



sec. VIII. — secondary acoustic bundle, from tuberculum acusticum 

 to cerebellum of same side. 



sec. X. — secondary vagus bundle (Mayser), from lobus vagi to 

 cerebellum of same side. 



so. I. to so. 14. — branches of the supra-orbital trunk. 



sp. g. — spinal ganglion. 



sp. V. t. — spinal V tract. 



sp. F///.— spinal VIII tract. 



s. p. I. to s. p. 5. — pores of the supra-orbital canal. 



SQ. — squamosal (pterotic) bone. 



sy. — the sympathetic nervous system. 



sy. c. — the left commissural root of the n. splanchnicus. 



sy. oph. Slip. — sympathetic fibres for the r. ophthalmicus super- 

 ficialis. 



sy. rec. j. — sympathetic root for the third root of the r. lateralis 

 accessorius. 



sy. I. to sy. 7. — ganglia of the head part of the sympathetic chain. 



sy. I. I. — lateral lobe of the first sympathetic ganglion. 



sy. I. m. — median lobe of the first sympathetic ganglion. 



/. a. — tuberculum acusticum. 



i.f. I and t. f. 2. — first and second anastomosing nerves from the 

 trigeminus to the truncus hyomandibularis. 



t. hm. — truncus hyomandibularis. 



/. inf. — infra-orbital trunk, containing the r. mandibularis V and 

 the r. maxillaris and the r. buccalis, together with communis fibres. 



tr. b. t. — tractus bulbo-tectalis, carrying fibres from the lobus 

 vagi and tuberculum acusticum to the optic tectum of the opposite 

 side. 



/. so. — truncus supra-orbitalis. 



t. X. I. to /. X. 4. — the four trunci branchiales vagi. 



u. — utriculus. 



V. — the root of the trigeminus. 



V. b. — ventral root of the first spinal nerve b. 



V. c. — ventral root of the first spinal nerve c. 



VI. — the n. abducens. 



VIII — the n. acusticus. 



Vlll-d. I. — anastomosing root beteen the VIII and dorsal lateralis 

 VII roots. 



V. lat. VII. — ventral lateralis root of the facialis. 



V. L g. VII. — the ventral lateral line ganglion of the facialis. 



V. m, — post-zonal ventral musculature. 



