Pisiform is considered as a sesamoid bone in the tendon of?
A. Flexor digitorum superficialis
B. Flexor digitorum profundus
C. Abductor digiti minimi
D. Flexor carpi ulnaris
Correct answer : D. Flexor carpi ulnaris
- Flexor carpi ulnaris is primarily inserted into the pisiform bone.
- But the muscle action is transmitted through ligaments into the hamate bone (via pisohamate ligament) and the 5th metacarpal bone (via pisometacarpal ligament).
- Hence, pisiform is considered as a sesamoid bone located in the tendon of flexor carpi ulnaris.
Other structures attached to pisiform:
- Flexor retinaculum
- Abductor digiti minimi
- Extensor retinaculum
Ref: B.D. Chaurasia’s Human Anatomy, 4th Edition, Vol 1, p27, 34, 102.
Image credits (pisiform bone) – Author: BodyParts3D by DBCLS; licensed under the Creative Commons Attribution-Share Alike 2.1 Japan license via http://en.wikipedia.org/wiki/File:Pisiform_bone_(left_hand)_01_palmar_view.png.