

UPPER EXTREMITY AND THORAX, ANTERIOR. 295 



the inner margin of the coronoid process of the ulna. (3) 

 From the oblique ridge on the front of the upper part of 

 the radius. 



See note, page 290. 



Insertion. By four tendons which perforate the tendons 

 of the long flexor muscle (as described in the dissection of 

 the hand, see page 311), and are attached to the sides of the 

 the second set of phalanges of the four fingers. 



Nerve Supply. The median (seventh and eighth cervical 

 and first thoracic nerves). 



Action. Beginning from below, the muscle will flex the 

 second, then the first set of phalanges, then the hand, and 

 perhaps slightly the forearm. 



DISSECTION. 



Remove the flexor sublimis digitorum from its radial attachment and turn it 

 inward, cleaning the median nerve, interosseous arteries, and nerve. Finish 

 the ulnar artery ; clean the last layer of muscles. 



The Ulnar Artery. Fig. 67. 



This is the other branch of brachial bifurcation just below 

 the elbow. It passes inward and downward under all the 

 superficial layer of muscles, and also between the flexor 

 sublimis and profundus digitorum. At the middle and 

 upper thirds of the forearm it bends directly downward and 

 enters the wrist over the annular ligament at the outer side 

 of the pisiform bone. 



The course of the lower two-thirds of the artery is indi- 

 cated by a line from the internal condyle to the outer side 

 of the pisiform bone. The guide to the artery is the inter- 

 muscular septum between the flexor sublimis digitorum and 

 the flexor carpi ulnaris. The artery has two accompanying 

 veins. 



Relations. In front : Pronator radii teres, flexor carpi 



