364 PRACTICAL ANATOMY. 



is a branch of the brachial artery, being given off from this vessel in the cubital 

 fossa. The groove is limited on the ulnar side by the flexor carpi ulnaris, this 

 muscle being the guide to the artery in the lower two-thirds of its forearm course ; 

 on the radial side by the flexor sublimis digitorum ; behind by the brachialis 

 anticus, the flexor profundus digitorum, and the pronator quadratus. The ulnar 

 artery is covered in the lower two-thirds by the skin and fasciae. In its course 

 from the cubital fossa to the ulnar groove proper, the artery passes behind all the 

 muscles that originate from the inner condyle of the humerus, except the flexor 

 carpi ulnaris. On entering the groove proper the artery is joined by the ulnar 

 nerve. 



1 1. Give boundaries of the cubital fossa, and tell what you found in t/iis fossa. 



Externally, is the supinator longus muscle ; internally, the pronator radii teres ; 

 above, an imaginary line passing through the humeral condyles. The roof is 

 formed by the skin and fasciae. The floor is formed by the brachialis anticus and 

 supinator brevis, containing between its superficial layers the posterior inter- 

 osseous nerve. The fossa contains the tendon of the biceps and bicipital tuber - 

 osity ; the median nerve ; the brachial artery, dividing into the radial and ulnar 

 arteries ; the musculo-spiral nerve, dividing into the radial and posterior inter- 

 osseous nerves ; the cutaneous branch of the musculo-cutaneous nerve ; the 

 median cephalic and median basilic veins. 



The student should now review the scheme of the brachial plexus on page 

 77, et seq. 



