FRONT OP THE FOREARM. 141 



the radial and ulnar ; these pass down the arm between the 

 muscles to the wrist, where they become comparatively 

 superficial, and then enter the hand. The median nerve lies 

 upon the inner side of the artery, at the hollow of the elbow, 

 and afterward passes down the middle line of the limb in 

 its course to the hand ; the ulnar nerve will be found on the 

 outside of the ulnar artery in its lower two-thirds; the 

 radial nerve also accompanies the radial artery till within 

 three inches of the wrist, where it becomes cutaneous, and 

 divides into two branches, distributed respectively to the 

 back of the thumb and dorsum of the hand. 



The PRONATOR RADII TERES is the, first muscle next the 

 tendon of the biceps on its inner side; it arises by two 

 heads, one from the inner condyle, and from the common 

 tendon above mentioned, the other, deeper, and not to be 

 seen in the present stage of the dissection, from the coro- 

 noid process of the ulna; the condyloid attachment some- 

 times receives additional fibres from the intermuscular 

 septum above the coiuiyle; this peculiarity is usually 

 associated with the existence of a supra-condyloid process 

 (p. 106). The muscle passes obliquely outward, to terminate 

 in a flat tendon which winds round the radius, and is 

 inserted into a rough surface on its outer side; this inser- 

 tion cannot be seen until the superficial muscles are 

 removed. The median nerve passes between its two heads. 

 The FLEXOR CARPI RADIALIS, arising next the pronator 

 radii teres, from the inner condyle and the common tendon, 

 becomes tendinous near its middle, and passing through 

 a distinct sheath, outside the arch of the annular ligament, 

 is inserted into the base of the metacarpal bone of the 

 index finger. The insertion cannot be seen till the hand is 

 dissected. The radial artery passes along the outer border 

 of the lower part of its tendon. 



The PALMARIS LONGUS MUSCLE lies on the inner side of 

 the flexor carpi radialis ; it has a small belly and a long 

 tendon, and is very often wanting; it arises from the internal 

 condyle and common tendon, and continuing down the cen- 

 tre of the forearm and over the annular ligament, is inserted 

 into the palmar fascia, with which it is continuous. 



The FLEXOR CARPI ULNARIS passes along the ulnar 

 border of the forearm, arising from the internal condyle 

 and common tendon, and also from the inner edge of the 

 olecranon, by a strong but thin apoiieurosis, underneath 

 which pass the ulnar nerve, and the recurrent branch of the 



