Muscles of the Upper Extremity. 



175 



230. The Muscles at the 



Anterior Eegion of the 



Hum ems. 



231. The Muscles at 



the Anterior Region 



of the Humerus. 



M. biceps brachii arises by two heads: The short head, Caput breve, in 

 common with the M. coraco-brachialis from the coracoid process ; the long head, 

 Caput longum, from the upper margin of the glenoid cavity of the scapula. It is 

 inserted into the -tuberosity of the radius. From the tendon of insertion an 

 aponeurotic band, Lacertus fibrosus (semilunar fascia), runs to the fascia of the 

 humerus. (Supinates the pronated radius and flexes the forearm.) 



M. coraco-brachialis arises from the coracoid pi-ocess and is inserted into 

 the end of the Spina tuberculi minoris in the middle of the humerus. It is per- 

 forated by the musculo-rcutaneous nerve. (Draws the humerus forwards and inwards.) 



