Capitulum of the humerus

Anterior view of the humerus

The capitulum of the humerus is a rounded eminence on the lateral portion of the distal articular surface of the humerus. It articulates with the head of the radius and is an important component of the elbow joint.

Anatomy

The capitulum is located on the distal end of the humerus, lateral to the trochlea of the humerus. It is a smooth, rounded structure that forms part of the articular surface for the elbow joint. The capitulum is covered with articular cartilage, which facilitates smooth movement between the humerus and the radius.

File:Capitulumhumeri.PNG

Capitulum of the humerus

The capitulum is best visualized from an anterior view of the humerus, where it appears as a small, rounded knob. It is positioned laterally, adjacent to the lateral epicondyle of the humerus.

Function

The primary function of the capitulum is to articulate with the head of the radius, allowing for the flexion and extension of the forearm at the elbow joint. It also permits a degree of rotation, which is essential for the pronation and supination of the forearm.

Clinical Significance

Injuries to the capitulum, such as fractures, can significantly impair elbow function. These injuries are often the result of trauma, such as falls or direct impacts to the elbow. Treatment may involve immobilization, physical therapy, or surgical intervention, depending on the severity of the injury.

Capitulum of the humerus

Related Structures

• Trochlea of the humerus
• Lateral epicondyle of the humerus
• Medial epicondyle of the humerus
• Head of the radius
• Elbow joint

Related Pages

• Humerus
• Radius (bone)
• Elbow joint
• Articular cartilage

Deep dissection of the elbow joint, anterior view

Additional Images

Capitulum of the humerus

See Also

• Anatomy of the upper limb
• Skeletal system
• Orthopedic surgery