. Cunningham's Text-book of anatomy. Anatomy. 918 THE VASCULAE SYSTEM. indicated on the surface, when the arm is abducted, by a line drawn from the middle of the clavicle to the centre of the bend of the elbow. Relations—Posterior.—It lies, successively, anterior to the long head of the triceps, the radial ( musculo-spiral) nerve and the profunda vessels intervening; the medial head of the triceps; the insertion of the coraco- brachialis ; and the brachialis. Anterior.—It is overlapped anteriorly by the medial border of the biceps, is crossed at the middle of the arm by the median nerve, a
. Cunningham's Text-book of anatomy. Anatomy. 918 THE VASCULAE SYSTEM. indicated on the surface, when the arm is abducted, by a line drawn from the middle of the clavicle to the centre of the bend of the elbow. Relations—Posterior.—It lies, successively, anterior to the long head of the triceps, the radial ( musculo-spiral) nerve and the profunda vessels intervening; the medial head of the triceps; the insertion of the coraco- brachialis ; and the brachialis. Anterior.—It is overlapped anteriorly by the medial border of the biceps, is crossed at the middle of the arm by the median nerve, and, in addition, it is covered by deep and superficial fascia and by skin. In the cubital fossa a thickened portion of the deep fascia, the lacertus fibrosus ( semilunar or bicipital fascia), separates it from the median basilic vein and the volar branch of the medial cutaneous nerve of the forearm, both of which lie in the superficial fascia. Lateral.— To the lateral side it is in relation proximally with the median nerve, and distally with the biceps. Medial.—To the medial side it is in relation, in the proximal part of its extent, with the basilic vein, the medial cutaneous nerve of the forearm, the medial cutaneous nerve of the arm, and the ulnar nerve, and in the distal part with the median nerve. Two vense comites, a medial and a lateral, accompany the artery, and com- munications between these pass across the vessel. Beanches of the Beachial Brachii. — The arm ( superior (1) Arteria Profunda profunda artery of the profunda) is a large branch which arises from the postero-medial aspect of the brachial soon after its commencement. It runs distally and laterally, with the radial ( musculo-spiral) nerve, in the radial sulcus ( musculo-spiral groove), and divides, at the back of the humerus, into two terminal branches, anterior andposterior. Not infrequently this division takes place at a higher level, and the artery appears double. The an
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