The blood supply of the thoracic limb originates from the axillary artery, which gives rise to the external thoracic, suprascapular, and subscapular arteries. The subscapular artery divides into four branches including the caudal circumflex humeral artery. The brachial artery further divides into the deep brachial, bicipital, collateral ulnar, transverse capital, and common interosseous arteries. The median artery then branches into the deep antebrachial, proximal radial, and medial palmer arteries which extend into the digits.

1. Blood supply of the thoracic limb
1:-Axillary artery:
A-External thoracic artery.
B-Suprascapular artery.
(supraspinatous&supscapularis)
C-Subscapular artery:- it is divided into 4 branches.
1/caudal circumflex humral artery.
2/circumflex humeral artery. (scapula)
3/Thoraco dorsal artery. (latissimus dorsi muscle)
4/cranial circumflex humeral artery.
(coraco brachial)
2:-Brachial artery:-
A-Deeb brachial artery. (Tricips)
B-Bicipital artery. (Bicips)
C-collateral ulnar artery. (ulna)
D-transverse capital artery. (Extensor m.of the digit)
E-common interosseous artery. (cupitallymphonode)

2. 3:-Median artery:-
A-Deep antebrachial artery.
B-proximal radial artery.
C-Medial palmer (Lateral palmer&medial palmer)
1/Medial palmer proper digital artery.
2/lateral palmer proper digital artery.
*Medial palmer extend to the end of the leg*