Upper limb
Radius
Radius
- Origin
- Lateral long bone of the forearm (thumb side); articulates with humerus, ulna, and proximal carpal bones (scaphoid and lunate)
- Insertion
- Insertion site for biceps brachii (radial tuberosity), brachioradialis, pronator teres, and supinator
- Function
- Rotates around the ulna to produce forearm pronation and supination; forms major part of radiocarpal wrist joint
- Innervation
- Radial, median, and musculocutaneous nerves
- Movement & chain
- Pronation, supination, wrist flexion, wrist extension, and radial deviation
- Palpation
- Radial head palpable below lateral epicondyle; radial styloid process palpable on lateral wrist
- Clinical
- Colles fracture (dinner-fork deformity in FOOSH falls); Smith fracture; radial head fracture; nursemaid's elbow (subluxation of radial head in young children)
- Segmental innervation
- C5–T1
- In clinical practice
- Radial pulse palpation site at the volar distal radius lateral to flexor carpi radialis tendon
- Region in the model
- Upper limb