Anatomy: Upper Limb - Forearm

Upper Limb - Forearm

Forearm Radius Is shorter than the ulna and is situated lateral to the ulna. Is characterized by displacement of the hand dorsally and radially when fractured at its distal end (Colles' fracture). Head (proximal end) Articulates with the capitulum of the humerus and the radial notch of the ulna and is surrounded by the annular ligament. Distal end Articulates with the proximal row of carpal bones , including the scaphoid, lunate, and triquetral bones but excluding the pisiform bone. Radial tuberosity Is an oblong prominence just distal to the neck and provides an attachment site for the biceps brachii tendon. Styloid process Is located on the distal end of the radius and is about 1 cm distal to that of the ulna and provides insertion of the brachioradialis muscle. Can be palpated in the proximal part of the anatomic snuffbox between the extensor pollicis longus and brevis tendons. Ulna  Olecranon Is the curved projection on the back of the elbow that provides an attachment site for the triceps tendon. Coronoid process Is located below the trochlear notch and provides an attachment site for the brachialis. Trochlear notch Receives the trochlea of the humerus. Ulnar tuberosity Is a roughened prominence distal to the coronoid process that provides an attachment site for the brachialis. Radial notch Accommodates the head of the radius. Head (distal end) Articulates with the articular disk of the distal radioulnar joint and has a styloid process.