DISTRIBUTION OF THE ARTERIFS. 



Fig. 7. 



at 



ax 



through the medium of 

 a single trunk, called the 

 aotlu, (Fig. 7.)* 



25. This great artery 

 first mounts upwards to- 

 wards the base of the 

 neck, then bends down- 

 wards, forming a sort of 

 crook, passes behind the 

 heart and descends ver- 

 tically, in front of the 

 spine, to the lower part 

 of the belly. In its 

 course, the aorta gives 

 off a great number of 

 branches, the principal of 

 which are : 



26. 1st. Thetwocflro- 

 tid arteries mount along 

 the sides of the neck, and 

 supply the head with 

 blood ; (fig. 7, ac.) 



27. 2d. The two arte- 

 ries of the upper extremi- 

 ties, successively obtain 

 the names of subc/acian, 

 axillary, and brnchial 

 arteries, as they pass 

 under the clavicle, or 

 cross the armpit, or de- 

 scend along the arm to 

 the elbow, where they 

 divide into two branches, 

 called the radial and 

 v/nar, or cubital arteries : 



Explanation of Fig. 7. The aorta and branches which arise from it to 

 cnvey the blood to all parts of the body, a, the aorta. c, arch of the 

 aorta, ac, carotid arteries, at, temporal arteries, r, sc, subclavian ar- 

 tery, r/.i, axillary artery, br, brachial artery, ra, radial artery, cu, 

 cubital or ulnar artery, i,i, intercostal arteries, cte, coeliac artery, re, 

 renal arteries, me, and mei, superior and inferior mesenteric arteries, 17, 

 iliac arteries,/, femoral arteries, t, tibial artery, p, the peroneal artery. 



25. Describe the course of the aorta? 



SJ6. What is the course and distribution of the carotid arteries? 



27. What arteries supply the upper extremities? 



