366 MUSCLES ON THE ANTERIOR PART OF THE FOREARM. 



of the olecranon, between which, and the origin from the 

 condyle, there is a space left, through which the ulnar nerve 

 passes to the forearm ; 'and a number of its fleshy fibres arise 

 from the tendinous membrane that covers the forearm. 



Fig. 95.* Inserted, by a short strong tendon, into 



the os pisiforme. At a little distance from 

 its insertion, a small ligament is sent off to 

 the metacarpal bone that sustains the little 

 finger. 



Use. To assist the former in bending the 

 arm. 



5. Flexor Sublimis Perforatus, 



Arises, tendinous and fleshy, from the 

 .internal condyle of the os humeri ; tendin- 

 ous from the coronoid process of the ulna, 

 near the edge of the cavity that receives the 

 head of the radius ; fleshy from the tubercle 

 of the radius ; and membranous and fleshy 

 from the middle of the forepart of the 

 radius, where the flexor pollicis longus 

 arises. Its fleshy belly sends off four round 

 tendons before it passes under the ligament 

 of the wrist. 



Inserted into the anterior and upper part 

 of the second bone of each finger, being near 

 the extremity of the first bone, and divided 

 for the passage of the perforans. 

 Use. To bend the second joint or phalanx of the fingers. 



6. Flexor Profundus Perforans, 

 Arises, fleshy, from the external side, and upper part of the 



* The deep layer of muscles on the forearm, i. The internal lateral liga- 

 ment of the elbow joint. 2. The anterior ligament. 3. The orbicular ligament 

 of the head of the radius. 4. The flexor profundus digitorum muscle. 5. The 

 flexor longus pollicis. 6. The pronator quadratus. 7. The adductor pollicis 

 muscle. 8. The dorsal interosseous muscle of the middle finger, and palmar 

 interosseous of the ring finger. 9. The dorsal interosseous muscle of the ring 

 linger and palmar interosseous of the little finger. 



