Flexor carpi ulnaris
|Flexor carpi ulnaris|
|Function:||Flexes and adducts hand, fixes pisiform|
|Origin:|| Humeral head - common flexor origin|
Ulnar head - aponeurosis from medial olecranon and upper three quarters of the posterior border of the ulna
|Insertion:||Pisiform, hook of hamate and base of little metacarpal|
|Innervation:||Ulnar nerve (C6, C7)|
|Search for Flexor carpi ulnaris in Gray's.|
Flexor carpi ulnaris is a flexor and adductor of the hand. It contains the pisiform within its distal tendon.
Flexor carpi ulnaris arises from two heads - humeral and ulnar. The two heads are connected by a tendinous arch, beneath which pass the ulnar nerve and posterior ulnar recurrent artery. The fibres of the two heads join in a tendon about halfway down the muscle's length, which then lies medial to the ulnar artery and ulnar nerve. The tendon inserts into the palmar surface of pisiform and then continues distally as the so-called pisohamate and pisometacarpal ligaments (both of which are continuations of the tendon rather than distinct ligaments) to the hamate and little metacarpal. A few fibres connect the tendon to the transverse carpal ligament.
The ulnar head of flexor carpi ulnaris from an aponeurosis from the medial olecranon and upper two thirds of the posterior border of the ulna (in common with extensor carpi ulnaris and flexor digitorum profundus).
- Flexion of the hand
- Adduction of the hand
- Stabilises pisiform, particularly during action of the hypothenar muscles
- Aponeurosis from the medial olecranon and proximal two thirds of the posterior border of the ulna
- May have slips of origin from the coronoid of the ulna