Extensor carpi ulnaris

The extensor carpi ulnarisExtensor / Adductor Back of forearm; straightens and adducts wrist. (ECU) muscle is a crucial component of the forearm. It controlsVariables that remain constant to ensure a fair test. the movementA fundamental property of life involving motion of the body or its parts. of the wrist and hand. 

Origin

The extensor carpi ulnaris originates from two main sites. One is the lateralAway from the midline of the body. epicondyle of the humerusLong bone of the upper arm; articulates with scapula at shoulder and radius/ulna at elbow., which is a bony prominence on the outer side of the elbow. The other is the posterior border of the ulnaMedial forearm bone (pinky side); forms the elbow hinge with humerus., one of the forearm bones.

Insertion

The muscle inserts into the baseA substance that accepts hydrogen ions (H⁺) or releases hydroxide ions (OH⁻). of the fifth metacarpal bone. This is a bone in the hand connected to the little finger. It also has an attachment to the pisiformPea-shaped carpal sitting on top of triquetral; palpable bump on wrist’s medial side. bone, a small bone in the wrist.

Actions

Wrist Extension

Deviation of the Wrist

Assistance in Grip Strength