We prepare to perform a dissection of the forearm and hand. This is an anterior view of the right upper extremity. We've removed the skin and superficial fascia. We indicate the radial or lateral border and the ulnar or medial border. This is a posterior view of the right upper extremity. We indicate the lateral or radial border and the medial or ulnar border. We return to an anterior view of the right upper extremity. For orientation again, we show the radial or lateral border and the ulnar or medial border. To facilitate our exposure of structures in the antecubital fossa, we divide the bicipital aponeurosis. From lateral to medial, we identify the biceps tendon, the brachial artery and vein, and the median nerve. We remove the deep fascia in order to identify individual muscles. We've removed the deep fascia in order to reveal underlying muscles, vessels, and nerves. We direct our attention to the elbow. We identify the lateral epicondyle, which is the origin of the brachioradialis. We identify again the tendon of the biceps, and the brachial artery and vein, which divide into radial and ulnar branches. We identify the median nerve and we showed the medial epicondyle. We direct our attention to the medial epicondyle, which is the origin of several muscles. We indicate the pronator teres, flexor carpi radialis, palmaris longus, the flexor carpi ulnaris, and the flexor digitorum superficialis. We note that the median nerve passes between the humoral and on our heads of the pronator teres. We prepare to examine the posterior arm in this upper right extremity. For orientation, we show the ulnar, or medial border, the radial or lateral border and we identify the lateral epicondyle and the olecranon. We incise the deep fascia to expose underlying muscles. We examine the superficial muscles of the dorsal forearm. We indicate the extensor carpi ulnaris, extensor digiti minimi, and the tendons of the extensor digitorum. With a view of the radial forearm, we identify the radius itself, the extensor carpi radialis brevis, and the extensor carpi radialis longus. We identify the superficial branch of the radial nerve and the brachioradialis. This is a view of the distal ulnar forearm. We identify the flexor carpi ulnaris, the ulnar itself, and the extensor carpi ulnaris. With a higher power view, we examine muscles having a deep origin in the forearm. Beginning on the ulnar side, we identify the extensor indicis, the extensor pollicis longus, the extensor pollicis brevis, and the abductor pollicis longus. Under dorsal forearm, we see an extensor retinaculum running between the radius and the ulnar. We divide the extensor retinaculum in order to follow the tendons distantly. We have exercised the extensor retinaculum and we follow the extensor tendons onto the hand. We identify the tendon of the extensor digiti minimi, and we see it crossed via a sensory branch of the ulnar nerve. We identify the tendons of the extensor digitorum and of the extensor indicis. This is a high power radial view at the base of the thumb. We examine the anatomical snuffbox. The anatomical snuff box is bounded by the tendon of the extensor pollicis longus on one side, and the tendons of the extensor pollicis brevis and abductor pollicis longus on the other side. We identify the superficial branch of the radial nerve. We show its branch to the base of the thumb and to the dorsum of the hand. Within the anatomic snuffbox, we identify the radial artery, which contributes to the deep palmar arterial arch. The floor of the anatomic snuffbox is formed primarily by the scaphoid bone. Point tenderness here may indicate fracture of the scaphoid. We remove the fascia on the floor of the anatomical snuffbox to reveal the scaphoid bone.
