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Head of radius

Recommended video: Radius and ulna [14:04]
Overview of the bones that define the forearm, the radius and ulna.

The proximal portion of the radius consists of the head, neck and radial tuberosity. The head of the radius is the disc shaped expanded portion of the proximal part of the radius.

It consists of two articular areas:

  • Articular circumference of head of radius
  • Articular facet of head of radius

The articular circumference of the head of the radius is the round perimeter of the cylindrical head of the radius. Its medial aspect articulates with the radial notch of the ulna, forming the proximal radioulnar joint. The lateral, anterior and posterior aspects of the articular circumference is surrounded by the annular ligament of the radius.

The articular facet of the head of the radius is the concave fovea located on its superior aspect. It articulates with the capitulum of the humerus forming the humeroradial joint.

The proximal radioulnar and humeroradial joints contribute to the formation of the elbow joint.

Terminology English: Head of radius
Latin: Caput radii
Definition Disc shaped, expanded portion of proximal part of radius
Function Contributes to formation of proximal radioulnar joint and humeroradial joint of elbow

Learn more about the bony landmarks of the radius in the study unit below.

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