It is the lateral bone of the forearm. It is the shorter of the two bones in the forearm. It articulates proximally with the humerus and ulna and distally with the carpal bones and ulna. It has two epiphyses and a diaphysis.
- Head – It is cylindrical and articulates with the humeral capitulum
- Glenoid cavity – Articulates with the capitulum (humerus)
- Radius Neck – Rounded, smooth, strangled portion located below the head
- Radial tuberosity – medially located eminence into which the tendon of the biceps brachii attaches
- Ulnar Notch – Articular face to the ulna
- Carpal Notch – It is concave, smooth and articulates with the scaphoid and lunate bones
- Styloid Process - Conical Projection
It has three edges and three faces.
The Radius articulates with four bones: the Humerus, Ulna, Scaphoid and Semilunar.
| RADIO - ANTERIOR, BACK AND MEDIAL VIEWS|
|Source: SOBOTTA, Johannes. Atlas of Human Anatomy. 21 ed. Rio de Janeiro: Guanabara Koogan, 2000.|