190 HUMAN ANATOMY. 



the condyles of the humerus, where it terminates by dividing into 

 the radial and ulnar artery. 



Relations. It is covered in front by the skin, superficial, and deep 

 fascia, and is crossed by the median nerve; behind it rests upon the 

 triceps, brachialis anticus, and coraco-brachialis muscles; 



And is in relation with the musculo-spiral nerve and the superior 

 profunda artery; to the outer side above it is in relation with the 

 biceps and coraco-brachialis muscles and the median nerve; and on 

 the inner side with the internal cutaneous and ulnar nerve, and the 

 basilic vein and median nerve below. 



At the bend of the elbow it is crossed by the bicipital fascia. 

 Its branches are : 



Superior profunda, accompanies the musculo-spiral nerve to 

 supply the triceps, deltoid, and coraco-brachialis muscles; 



Nutrient artery, supplies the shaft of the humerus; 



Inferior profunda, accompanies the ulnar nerve to supply 

 the triceps muscle and structures about the internal condyle ; 



Anastomotica magna, forms an anastomosis on the lower 

 posterior aspect of the arm, with branches from the inferior 

 profunda and recurrent ulnar vessels. It supplies the triceps; 



Muscular, supply the muscles on the anterior aspect of the 

 arm. 



THE RADIAL ARTERY 



descends from the bifurcation of the brachial below the bend 

 of the elbow to the wrist, where it winds around the carpus 

 beneath the extensor tendons of the thumb, passes between the 

 two heads of the first dorsal interosseous muscle and into the 

 palm of the hand, where it forms the deep palmar arch, anasto- 

 mosing with the deep branch of the ulnar artery. Its branches 

 are, in the forearm : 



Radial recurrent, supplies the brachialis anticus and supinator 

 longus and brevis; 



Muscular, supply the radial muscles; 



Superficialis volae, supplies the muscles of the thumb and anasto- 

 moses with the ulnar to form the superficial palmar arch; 



Anterior carpal, supplies the wrist-joint. 



In the wrist: 



Posterior carpal, supplies the wrist-joint, forms the posterior 

 carpal arch, and gives off the dorsal interosseous arteries; 



Metacarpal, is called the first dorsal interosseous; it supplies the 

 index and middle finger; 



Dorsales pollicis, supply the back of the thumb; 



Dorsalis indicis, supplies the outer and dorsal side of the index 

 finger. 



