Muscle
Extensor carpi ulnaris
Extends and adducts the wrist
High-yield
Extends and adducts (ulnar deviates) the wrist; posterior interosseous nerve.
Overview
The most medial superficial extensor, extending and ulnarly deviating the wrist. Supplied by the posterior interosseous nerve.
Reference facts
- Origin
- Lateral epicondyle of the humerus and posterior border of the ulna
- Insertion
- Base of the 5th metacarpal
- Action
- Extends and adducts (ulnarly deviates) the wrist
- Innervation
- Posterior interosseous nerve (C7, C8)
- Blood supply
- Ulnar / posterior interosseous arteries
Frequently asked questions
What does the extensor carpi ulnaris do?
The extensor carpi ulnaris extends and adducts (ulnarly deviates) the wrist.
What nerve innervates the extensor carpi ulnaris?
The extensor carpi ulnaris is innervated by the posterior interosseous nerve (C7, C8).
Where does the extensor carpi ulnaris attach?
The extensor carpi ulnaris originates from the lateral epicondyle of the humerus and posterior border of the ulna and inserts on the base of the 5th metacarpal.
What is the blood supply of the extensor carpi ulnaris?
The extensor carpi ulnaris is supplied by the ulnar / posterior interosseous arteries.