Pisiform is a sesamoid bone in the tendon of – Anatomy MCQ

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 UlnarisFlexor 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.

Pisiform bonePisiform bone

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.

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