The humerus is a long bone in the arm that runs from the shoulder to the elbow.

It connects the scapula and the radius

Body of humerus - cylindrical in its upper portion, and more prismatic below.

Lower extremity of humerus - consisting of a faceted condyle that articulates with the radius.

Upper extremity of humerus - consisting of a rounded head, a narrow neck, and two short processes, or "tuberosities". Distally, the capitulum of the humerus articulates with the head of the radius, and the trochlea of the humerus articulates with the olecranon process of the ulna.

Above the back of the trochlea is a deep triangular depression, the olecranon fossa, in which the summit of the olecranon is received in extension of the forearm.

The grooved surface at the lower end articulating with the trochlear notch of the ulna.

A bony prominence of the outer aspect is the lateral epicondyle that provides origin for the muscles which dorsiflex the wrist. Inflammation at this site is known as tennis elbow. medial epicondyle is larger and more prominent than the lateral epicondyle that gives attachment to the ulnar collateral ligament of the elbow-joint and ulnar nerve runs in a groove on the back of this epicondyle.

Above the front part of the trochlea is a small depression, the coronoid fossa, which receives the coronoid process of the ulna during flexion of the forearm.

The radius is the bone of the forearm that extends from the lateral side of the elbow to the thumb side of the wrist. The radius is situated on the lateral side of the ulna, It is a long bone, prism-shaped and slightly curved. The radius articulates with the capitulum of the humerus.Radius connects the elbow to the forearm.

Head of Radius, disk shaped prominence at proximal end of bone, forms articulating surface with capitulum of humerus.Radial tuberosity is a round projection that serves as an attachment point for Biceps Brachii muscle.Ulnar notch of Radius, slide depression that articulates with Ulna.Styloid process of Radius is the lateral projection at distal end of bone that forms lateral portion of wrist joint.

The ulna is a long bone, prismatic in form, placed at the medial side of the forearm, parallel with the radius. It is divisible into a body and two extremities, it forms a large part of the elbow-joint; the bone diminishes in size from above downward.

Ulnar Tuberosity round distal end of coronoid process, serves as an attachment point for Brachialis muscle.Styloid process of ulna is small, medial projection from head region, forms medial portion of wrist joint. The radial notch of the ulna is a narrow, oblong, articular depression on the lateral side of the coronoid process; it receives the circumferential articular surface of the head of the radius

Olecranon process of Ulna large, fan shaped projection from proximal end of trochlear notch, forms elbow.Trochlear notch of Ulna large depression at proximal end of bone, area of articulation with trochlea of humerus.Coronoid process of Ulna – anterior projection from trochlear notch.

There are 15 bones that form connections from the end of the forearm to the hand. The wrist itself contains eight small bones, called carpal bones. These bones are grouped in two rows across the wrist.

The proximal row is where the wrist creases when you bend it. Beginning with the thumb-side of the wrist, the proximal row of carpal bones is made up of the scaphoid, lunate, and triquetrum.

The second row of carpal bones, called the distal row, meets the proximal row a little further toward the fingers. The distal row is made up of the trapezium, trapezoid, capitate, hamate, and pisiform bones.

The wrist is so complicated because every small carpal bone forms a joint with the bone next to it. The wrist joint is actually made up of many small joints.

The proximal row of carpal bones connects the two bones of the forearm, the radius and the ulna, to the bones of the hand.

The bones of the hand are called the metacarpal bones. These are the long bones that lie within the palm of the hand. The metacarpals attach to the phalanges, which are the bones in the fingers and thumb.