94 THE MUSCLES. 



1. The tldnl finger has two^ one to the radial side (Fig-. 79 i'-^, 

 one to the ulnar side. 



2. H\\Q, fourth finger has three, the third (Fig. 79 i'4) arises from 

 the eai-puSj and perhaps ought rather to be regarded as an extensor. 



3. ^heffth finger has two. 



IV. MUSCLES OF THE HINDER LIMB. 



I. Muscles of the Thigh. 



General arrangement (Figs. 80, 81). 



a. The in. triceps femoris forms the outer border of the thigh, and 

 extends on to both the dorsal and ventral surfaces. The outer 

 border therefore corresponds with the anterior surface of the thigh 

 of man^ in consequence of the thigh in the frog being normally 

 rotated outwards. 



b. The m. vastus intermis (v. i.) and a portion of the adductor longus 

 {ad'), the sartorius {s), a portion of the adductor magmis {ad"'), and 

 the rectus intermis major {r. i') are found on the imier surface of the 

 thigh. 



c. The rectus intermis minor {r.i") forms the imier border. 



d. On the dorsal surface are to be seen, nearest the trunk^ the 

 glutaeus {gl), on the outer border the vastus externus {v. e.), the j)?/ri- 

 formis and bicej)s {p and b), then the sonimemlranosus {sin), and lastly 



the rectus intermis minor {ri"). 



e. By reflecting th,e rectus internus major (compare Fig. 83) there 

 are exposed to view : the semitendinostis {st), the whole length of 

 the adductor longus, magnus {ad' and ad"'), and hrevis {ad"). By re- 

 flecting the triceps, one sees (Figs. 84, 85) the ilio psoas [iji), and 

 beneath the semimembranosus, the quadratus {qf), and capsularis 

 femoris {og). 



Description of tlie separate Muscles. 

 (A.) Muscles of the dorsal surface. 

 109. M. glutaeus (Fig. 80 gl). 



Dugès, ex-ilio-trochantérien. — Zenker, ghitaens maior. 



The tendinous origin of this muscle is found on the outer surface 



and upper border of the two hinder thirds of the iliac bone. Thence 



it runs outwards and backwards between the head of the m. vastus 



externus {ve) on the one side, and the ilio-psoas and rectus anticus {ra) 



