Be careful when retracting the conjoint tendon during anterior shoulder sugery (avoid injury to the musculocutaneous nerve). pectoralis minor (N188, N189, N428, TG2-12, TG4-07) serratus anterior (N188, TG4-07) ribs 3-5 ribs 1-8 or 9 coracoid process of the scapula medial border. The lateral antebrachial cutaneous nerve could be injured during distal biceps repair. When the musculocutaneous nerve is injured, we may not be able to measure the deficit except for the decreased sensation on the area supplied by the lateral antebrachial cutaneous nerve, which is a terminal branch that will give sensation to the forearm. The nerve runs between the biceps and the brachialis muscles on the anterior shoulder especially with retreaction of the conjoint tenson of the coracobrachialis and short head of the biceps. ![]() Some studies show that the nerve may be 1-5 cm from the coracoid. scapular fractures with the most common mechanism of injury for coracoid process fractures being a direct blow or a forceful muscular contraction causing an. The musculocutaneous nerve pierces the coracobrachialis about 3-8 cm distal to the coracoid where it then gives a branch to the coracobrachialis muscle. The coracobrachialis muscle originates from the coracoid, and the musculocutaneous nerve is close to the muscle. The coracobrachialis muscle flexes and adducts the arm at the shoulder joint. These tendons and muscles of the shoulder provide. It is the primary nerve supply of the muscles of the anterior compartment of the upper arm, and it supplies sensation to the lateral half of the forearm. Other supporting tendons include the pectoralis minor, coracobrachialis and the short head of the biceps. The musculocutaneous nerve will also give the lateral antebrachial nerve with its anterior and posterior divisions. The medial part of the muscle innervation is from the musculocutaneous nerve and the lateral part of the muscle gets innervation from the radial nerve. The innervation of the coracobrachialis, biceps brachaii, and brachialis muscle comes from the musculocutaneous nerve. The coracobrachialis muscle inserts into the middle third of the medial border of the humeral shaft. They take an important part in forming the coraco-humeral arch. The conoid ligament is medial and the trapezoid ligament is lateral. They are deep structures and the site for attachment of three muscles and two major ligaments. Close to the origin of the coracobrachialis is the origin of the coracoclavicular ligaments. The coracobrachialis lies lateral to the pectoralis minor muscle. ![]() The coracobrachialis muscle arises from the tip of the coracoid process.
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