42 



fPia mater, a vascular memlirane investing cord and continuous vith 



JliJMBEANES LINING J j^^^^ ^^^^^^^ jj^j^g ^^^^j ^^,^j^_ 



ivANAL A. -"S j^^i-achnoid superficial to pi.i mater and dura raater, and secreting arachnoid 



VESTING COHD 1^ fluid (blue). 



Fig. 5 and Uiag. 3. Ckahiai, Nerves, and their distribution — 



I. Olfactory (L. oleo, I smell) distributed to olfactory sac, as shown in Diag. 1. 

 II. Optic distributed to eye (Diag. 3). 



III. Oculo-motor (L. oculus, ej'e ; motor, mover) distributed to four muscles of eye (Diag. 3). 



IV. Pathetic distributed to superior oblique muscle (Diag. 3). 

 V. Trigeminal dilates into Gasserian ganglion giving off — 



\'\ Orbito-nasal or ophthalmic distributed chiefly to the nasal chamber. 

 V-. Superior maxillary distributed to upper jaw. 



V^ Inferior maxillary or mandibular distributed to lower jaw or mandible. 

 VI. Abducens (L. ahduco, I draw away) distributed to external rectus muscle (Diag. 3). 

 VII. Facial or portio dura (blue) dividing at Gasserian ganglion into — 

 yil". Or anterior distributed chiefly to the palate. 



VII^. Or posterior dividing into a branch to the hyoid and a branch to mandible by way 

 of tympanic cavity = chorda tympani (L. cord of the drum). 

 VIII. Auditory or portio mollis distributed to the auditory capsule (Diag. 1). 

 IX. Glossopharynge'al (Gr. glossa, the tongue; ^>7innma;, the throat) distributed to tongue and 

 pharynx (yellow). 

 X. Pneumogastric {Gr. imeumon, the lungs; gaster, the stomach) or Vagus (L. wandering) (red) — 

 X^ Cutaneous branch distributed to dorsal integument. 

 X-. Cardiac branch distributed to heart. 

 X^. Laryngeal branch distriliuted to larynx. 

 X*. Pulmonic branch distributed to lungs. 

 X^. Gastric branch distributed to guUet and stomach. 

 Fig. G. Xeuves of Hixd-Limb, bones displaced to show nerves of dorsal sm-face — 



Sciatic 



r 

 IP 



Perone'al (Gr. perone, the fibula) running beside peroneus muscle, 

 'osterior tibial running beside tibialis posticus muscle. 



XIuscuLAK System — 



Diag. 3. Muscles of Eye. 



Fig. 7. Superficial MusoLEb of Hind-Limb. Frog dissected when laid on back, with dorsal surface of 

 foot uppermost. 



Name. 

 Adductores— brevis, magnus, and 



longus. 

 vSartorius. 



TuiGH 



Leg 



Rectus interuus major. 

 Rectus internus minor. 

 Vastus internus. 



I Gastriicnemius, the bulk of the calf of the leg 

 (Gr. (/aster, the belly; kneme, the leg). 

 Tibialis posticus (L. posterior tibial). 

 Peronc'us. 

 Tibialis anticus (L. anterior tibial). 



Extensor cruris brevis (L. short extender of 



the leg). 

 Flexor tarsi anterior (L. anterior bender of 

 I the tarsus). 



