Pisiform

Pisiform is a small bone in the human wrist that is part of the proximal row of carpal bones, and is situated where the ulna joins the carpus. It is also known as the pea-shaped bone due to its small, rounded shape.

Anatomy

The pisiform is a sesamoid bone, meaning it is embedded within a tendon. Specifically, it is located in the tendon of the flexor carpi ulnaris muscle. It is situated on the palmar side of the wrist and is palpable in this position. The pisiform articulates only with the triquetral bone, which is located medially to it.

Function

The pisiform serves as a support for the ulnar artery, helping to keep it in place. It also provides an attachment point for several ligaments, including the pisohamate ligament and the pisometacarpal ligament. These ligaments help to stabilize the wrist and hand.

Clinical significance

Injuries to the pisiform are relatively rare, but can occur as a result of trauma to the wrist. Fractures of the pisiform can cause pain and swelling in the wrist, and may require surgical intervention. The pisiform can also be affected by conditions such as arthritis and carpal tunnel syndrome.

See also

• Carpal bones
• Wrist
• Ulnar artery
• Flexor carpi ulnaris muscle

References

Pisiform Resources
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