It is inserted by means of a flat tendon into an impression at the middle of the medial surface and border of the body of the humerus ( shaft of the humerus ) between the origins of the triceps brachii and brachialis.
32.
It ascends between the branches of the radial nerve, lying on the supinator muscle and then between the brachioradialis muscle and the brachialis muscle, supplying these muscles and the elbow-joint, and anastomosing with the terminal part of the profunda brachii.
33.
At the junction of this surface with the front of the body is a rough eminence, the tuberosity of the ulna, which gives insertion to a part of the brachialis; to the lateral border of this tuberosity the oblique cord is attached.
34.
The biceps brachii, brachialis, and brachioradialis ( which attaches distally ) act to flex the elbow . ( The biceps do not attach to the humerus . ) The triceps brachii and anconeus extend the elbow, and attach to the posterior side of the humerus.
35.
It extends from the lower part of the crest of the lesser tubercle of the humerus below the teres major, and passes along the medial supracondylar ridge to the medial epicondyle; it is blended with the tendon of the coracobrachialis, and gives attachment to the triceps brachii behind and the brachialis in front.
36.
The signs of Erb's Palsy include loss of sensation in the arm and paralysis and atrophy of the deltoid, biceps, and brachialis muscles . " The position of the limb, under such conditions, is characteristic : the arm hangs by the side and is rotated medially; the forearm is extended and pronated.
37.
The humerus is wide on the distal end, while the shaft is broken off and missing above the " fossa m . brachialis " but enough bone is present to show that the shaft is curved . " A . bullockensis " was smaller in size then " A . audax ", " A . chrysaetos " and larger than " A . fasciata ".
