Upper limb

5x puncte

categorie: Medicina

nota: 9.82

nivel: Facultate

The musculocutaneous nerve pierces through the coracobrachialis muscle, and it goes below the brachialis muscle. At the distal end, it becomes the lateral antebrachial cutaneous nerve that comes out from below the biceps at the lateral side of the tendon (running together with the cephalic vein).The Median nerve arises from the medial and lateral cords (having the appearance of a V-shaped nerve),[...]
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The musculocutaneous nerve pierces through the coracobrachialis muscle, and it goes below the brachialis muscle. At the distal end, it becomes the lateral antebrachial cutaneous nerve that comes out from below the biceps at the lateral side of the tendon (running together with the cephalic vein).The Median nerve arises from the medial and lateral cords (having the appearance of a V-shaped nerve), and it runs through the medial bicipital groove on the arm together with the ulnar nerve, the medial brachial cutaneous and medial antebrachial cutaneous nerves, and the brachial artery.

Then, it goes to the cubital fossa (at the middle), and it is the most medial structure of the cubital fossa. The middle structure is the brachial artery, and the lateral structure is the tendon of the biceps muscle. The median nerve (after the cubital fossa) goes to the forearm between the flexor digitorum superficialis (in its fascia) and the flexor digitorum profundus in the midline of the forearm (that's why it's called the median nerve). Then, it goes through the carpal canal. In the palmar region, it is covered by the palAZmaris longus tendon. If this muscle is missing, the nerve runs between the flexor carpi radialis tendon and the flexor digitorum tendons.

In the palm, it divides into superficial and the deep branches. The deep branch innervates the thenar muscles (except the adductor) and the 1st and 2nd lumbricals. The superficial branch innervates the skin of the palm and the lateral 3Aoe fingers by seven digital branches.The Ulnar nerve arises from the medial cord of the brachial plexus and runs though the medial bicipital groove on the arm, but leaves the groove and pierces through the medial intermuscular septum and goes to the sulcus nervi ulnaris.

Then, it reaches the forearm between the two heads of the flexor carpi ulnaris muscle. In the inferior 1/3 of the forearm, we can find the ulnar nerve covered by the flexor digitorum profundus together with the ulnar artery. The ulnar artery, in the superior 1/3 of the forearm, is between the deep and the superficial muscles, and afterward it joins the ulnar nerve.
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