SURGICAL ANATOMY OF 



ally visible. Again, the various movements of the arm 

 and of the clavicle cause considerable modifications of 



FIG. 15. 



IV 13 



Diagrammatic section through the centre of the right clavicle, showing the 

 relation of the subclavian vessels in their antero-posterior direction. 1. Subola- 

 vian artery. 2 Suholavian vein. 3. Anterior scalenus muscle. 4. First rib. 5. Pec- 

 toralis major. 6. Subclavius muscle. 7. Clavicle. 8. Cords of brachial plexus. 

 9. Scalenus medius. 10. Transversalis colli artery. 11. Trapezius. 12. Levator 

 anguli scapulae. 13. Rhomboid. 14. Cavity of thorax. 



its form, and the relations of its contents a circum- 

 stance of great importance to the surgeon. 



Compression of the subclavian artery is generally neces- 

 sary in amputations about the upper arm, and very 

 slight pressure is requisite. The thumb or finger is to be 

 slipped just behind the posterior border of the sterno- 

 mastoid, where it is attached to the clavicle, and on slight 

 pressure being made in a vertical direction to the axis of 

 the body, the pulsation of the vessel is felt ; a little fur- 

 ther pressure at the pulsating point compresses it against 

 the first rib, and does not interfere with the circulation 

 in the subclavian vein. The circulation may be con- 



