Ligament · Hand

Pisohamate ligament

Ligamentum pisohamatum

A short strong band from the pisiform — the pea-sized bone you can feel at the heel of the palm on the little-finger side — to the hook of the hamate just beyond it. It is best read as a continuation of the flexor carpi ulnaris tendon: that muscle ends on the pisiform, and this ligament carries its pull onward to the hamate, which is why the pisiform behaves like a sesamoid bone inside a tendon rather than like a free carpal bone. It also contributes to the floor of Guyon's canal, the short passage the ulnar nerve and artery travel through to enter the hand — the floor is shared with the flexor retinaculum and the pisometacarpal ligament, and the ulnar wall is the pisiform itself. That still puts the band directly beneath the nerve.