BRANCHES OF THE SUBCLAVIAN AND AXILLARY. 279 



From the Aorta till the Artery passes over the first rib, it is called, 



1. The Subdavian Artery. When this artery is injected, and tolerably full, it 

 makes two pretty acute turns, in the form of an italic S, before it escapes 

 under the clavicle. Its larger curve is just where it comes through the 

 anterior and middle Scaleni muscles. It then descends directly across the 

 first rib. It next comes out under the clavicle, three fingers' breadth from 

 the inner extremity of the clavicle. Just at this point, viz. where it 

 passes over the bulging of the rib, it may be compressed in the living body. 

 Its branches are, 



2. The Internal Mammary Artery.* 



3. The Vertebral Artery. 



4. The Thyroid Artery. 



5. The Ascending Thyroid Artery, a branch of the last. The Trans- 

 versalis Colli, or Cervicalis Posterior, is also generally a branch of 

 the Thyroid, very irregular in its origin. Sometimes it comes from 

 the Thyroid, and then receives the name of Transversalis Humeri; 

 sometimes it comes from the place of the Cervicalis Superficialis , or 

 even from the Subscapularis ; sometimes from the Subclavian itself. 



The Deep and Superficial Cervical Arteries. 



6. The Supra Scapular Artery. 

 The Axilla. 



7. The Trunk now assumes the name of Axillary Artery. Its branches 

 are three or four to the chest ; three to the scapula and shoulder. 



8. The Lesser Superior Intercostal Artery, or Superior Thoracic Artery. 



9. The Greater or Longer Thoracic Artery, or External Mammary 

 Artery. 



10. The Thoracica Acromialis, or Humeraria. 



The Thoracica Axillaris is not seen in this subject. 



1 1 . The Subscapular Artery ; it is seen to divide upon the edge of the 

 Scapula, into a deeper and a more superficial branch. 



12. The Posterior Circumflex Artery of the arm. 



13. The Anterior Circumflex Artery of the arm. 

 In the Arm. 



14. The Trunk now assumes the name of Humeral Artery ; it gives off 

 These branches : 



15. The Superior, or Greater Profunda. 



16. The Lesser Profunda. 



* Branches of the Internal Mammary Artery. 1. To the Thymus Gland. 2. 

 Accompanying the Phrenic Nerve. 3. To the Pericardium. 4. To the 

 Mediastinum. 5. Several branches to the Pectoral Muscle and Mamma. 6. 

 To the Diaphragm. 7. To the Abdominal Muscles, inosculating with the Epi- 

 gastric Artery. If a thrust be made with a small sword in any part (below 

 the second rib) in a line parallel with the Sternum, and three-fourths of an inch 

 from its edge, it will wound the Internal Mammary Artery. 



