Canine axillary a.: The brachiocephalic trunk (1) gives off left and right (2) common carotid aa. and continues as the right subclavian a. (3). Lateral to the first rib (asterisk) the subclavian is re-named axillary a. (4). Branches of the axillary a. are: external thoracic a. (5), lateral thoracic a. (6), subscapular a. (7), and cranial circumflex humeral a. (8). Thereafter the axillary is re-named brachial a. (9).
The four branches of the subclavian a. are: superficial cervical a. (10), internal thoracic a. (11), vertebral a. (12), and costocervical trunk (13). Notice that the right external jugular v. (14) joins the stump of the right subclavian v. (arrowhead) to form the right brachiocephalic v. (15). The two brachiocephalic vv. join to form the cranial vena cava (double asterisk).