GENERAL ACCOUNT OF THE GREAT VEIN OF THE ARM. 319 



ceeds before or below it to the axilla. In this situation, it mves 

 off branches to the contiguous parts, ^'^S' 1^9.* 



which correspond with those given off ^j 



by the artery. In this course it also n „i 7 



often gives off a large branch, called the 



CepAaZic, 



Which soon becomes superficial, and 

 proceeds downwards between the mar- 

 gins of the deltoid and pectoral muscles : 

 it continues superficial on the external 

 side of the biceps muscle, sending off 

 many cutaneous branches. Near the 

 external condyle of the os humeri, it 

 generally sends off a branch towards the 

 middle of the anterior part of the fore- 

 arm, which is called the Median Ce- 

 phalic, and also some other superficial 

 branches. It then continues over the 

 radius, and inclining to the back of the fore-arm, until it arrives 

 at the back of the hand, where it divides into branches, some of 

 which go to the thumb. 



In the axilla, the great vein, there called 



The Axillary Vein, 

 Generally divides into two or three branches. One, which is 

 commonly the largest, and appears like the continuation of the 

 main trunk, is called 



* The veins of the fore-arm and bend of the elbow. 1. The radial vein. 

 2. The cephalic vein. 3. The anterior ulnar vein. 4. The posterior ulnar vein. 

 5. The trunk formed by their union. 6. The basilic vein, piercing the deep 

 fascia at 7. 9. A communicating branch between the deep veins of the fore- 

 arm and the upper part of the median vein. 10. The median cephalic vein. 

 11. The median basilic. 12. A slight convexity of the deep fascia, formed by 

 the brachial artery. 13. The process of fascia, derived from the tendon of the 

 biceps, and separating the median basilic vein from the brachial artery. 14. 

 The external cutaneous nerve, piercing the deep fascia, and dividing into two 

 branches, which pass behind the median cephalic vein. 15. The internal cuta- 

 neous nerve, dividing into branches, which pass in front of the median basilic 

 vein. 16. The intercosto-humeral cutaneous nerve. 17. The spiral cutaneous 

 nerve, a branch of the musculo-spiral. 



