Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The extensor carpi ulnaris is a muscle located in the forearm that extends and adducts the wrist. It runs from the elbow to the hand, attaching to the ulna and the base of the fifth metacarpal bone.
Related terms
Flexor carpi ulnaris: This muscle acts opposite to the extensor carpi ulnaris, flexing and adducting the wrist.
A long bone in the forearm that serves as an attachment point for muscles including the extensor carpi ulnaris.
Metacarpal bones: The five long bones in the hand that connect to each digit; the extensor carpi ulnaris attaches to the base of the fifth metacarpal bone