8o 



THE UPPER EXTREMITY 



tensor carpi radialis longus. Its deep surface is closely 

 connected to the anterior part of the capsule of the elbow- 

 joint, its chief nerve of supply, from the musculo-cutaneous, 



Lateral end of clavicle 

 ^^-Margin of acromion process 



Pectoralis major 

 ,, Cephalic vein 



L Deltoid 



Cutaneous branches of Axillary 

 nevve piercing deltoid 



Lateral hrachial cutaneous branch 

 of axillary (O. T. circumflex) nerve 



Biceps brachii 



Lateral head of triceps 



Brachialis 



Upper branch of dorsal cutaneous 

 nerve of forearm 



Cephalic vein 



Lower branch of dorsal cutaneous 

 nerve of forearm 



Brachioradialis 

 Tendon of triceps 



Olecranon 

 Extensor carpi radialis longus 



FIG. 34. The Deltoid Muscle and the lateral aspect of the Arm. 



has already been secured, but it also receives one or two 

 small twigs from the radial (tnusculo-spirat) nerve which are 

 given off under cover of the brachioradialis. 



Dissection. Separate the brachioradialis from the brachialis muscle, 



