Pisiform bone
Pisiform Bone
The Pisiform bone (pronounced: pie-si-form bone) is a small, pea-shaped bone found in the human wrist. It is considered a sesamoid bone, meaning it is embedded within a tendon or muscle, specifically the flexor carpi ulnaris.
Etymology
The term "Pisiform" is derived from the Latin word "pisum," which means "pea," and the suffix "-form," which is derived from the Latin word "forma," meaning "shape." Thus, the term "Pisiform" literally translates to "pea-shaped."
Anatomy
The Pisiform bone is located on the ulnar side of the wrist and articulates with the anterior surface of the triquetral bone. It is unique among the carpal bones as it is not directly involved in the wrist joint and only makes contact with a single other bone.
Function
The primary function of the Pisiform bone is to provide a bony support for the tendon of the flexor carpi ulnaris muscle. It also serves as a site for the attachment of several ligaments, including the pisohamate and pisometacarpal ligaments.
Related Terms
- Sesamoid bone: A type of bone that is embedded within a tendon or muscle.
- Flexor carpi ulnaris: A muscle of the human forearm that acts to flex and adduct the wrist.
- Triquetral bone: One of the eight small carpal bones in the wrist.
- Pisohamate ligament: A ligament in the wrist that connects the pisiform bone to the hamate bone.
- Pisometacarpal ligament: A ligament in the wrist that connects the pisiform bone to the metacarpal bones.
External links
- Medical encyclopedia article on Pisiform bone
- Wikipedia's article - Pisiform bone
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