. The anatomy of the human body. Human anatomy; Anatomy. THE TRICEPS EXTENSOR CUBITI. 247 anatomists with the short head of the biceps, with which, indeed, it is intimately united at its upper part. Attachments.—It arises from the apex of the coracoid process, and is inserted towards the middle of the internal surface and border of the humerus. It arises from between two tendinous layers, the most superficial of which is common to it and the short head of the biceps, and also from the septum between these two muscles. From this origin the fleshy fibres proceed, forming an elongated, thin, and
. The anatomy of the human body. Human anatomy; Anatomy. THE TRICEPS EXTENSOR CUBITI. 247 anatomists with the short head of the biceps, with which, indeed, it is intimately united at its upper part. Attachments.—It arises from the apex of the coracoid process, and is inserted towards the middle of the internal surface and border of the humerus. It arises from between two tendinous layers, the most superficial of which is common to it and the short head of the biceps, and also from the septum between these two muscles. From this origin the fleshy fibres proceed, forming an elongated, thin, and flat bundle, the size of which is always in an inverse ratio to that of the short head of the biceps ; this bundle passes downward, backward, and a little outward, to be inserted into the humerus, between the brachialis anticus and the triceps. Its insertion is effected by means of a flat tendon, which receives the fleshy fibres successively upon its edges and external surface, and is accompanied by them even to its attachment to the bone. The precise situation of the attachment varies like that of the deltoid, and hence the different statements of authors regarding this point. According to Winslow, the coraco-brachialis is inserted at the up- per part of the middle third of the humerus ; according to M. Boyer, in the middle of the bone ; and according to Bichat, a little above its middle. I have found it inserted at the junction of the lower with the two upper thirds. Relatione.—It is covered by the deltoid, the pectoralis major, and the biceps, and it covers the sub-scapularis, the latissimus dorsi, and the teres major. Its relations to the axillary and brachial arteries, and the median and musculo-cutaneous nerves, are the most important. Above, it covers these parts, and then it is in relation with the outer side of the brachial artery and median nerve, so that its tendon alone separates the ves- sel from the bone. The musculo-cutaneous nerve passes through it; hence th
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