Pisiform aiculates with –
**Core Concept**
The pisiform bone is one of the eight carpal bones in the human wrist. It plays a crucial role in the formation of the carpal tunnel, a narrow passageway for the median nerve and tendons. The pisiform bone is a sesamoid bone embedded in the flexor carpi ulnaris tendon.
**Why the Correct Answer is Right**
The pisiform bone articulates with the triquetrum bone, a nearby carpal bone. This articulation is a synovial joint that allows for limited movement between the two bones. The pisiform bone is a distinctive landmark in the wrist, and its articulation with the triquetrum is essential for understanding the anatomy of the carpal tunnel.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as there is no known articulation between the pisiform and the scaphoid bones.
**Option B:** This option is incorrect as the pisiform bone does not articulate with the lunate bone.
**Option C:** This option is incorrect as the pisiform bone does not articulate with the capitate bone.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize the pisiform bone's articulation with the triquetrum bone to avoid confusion with other carpal bones and to accurately diagnose wrist injuries.
**Correct Answer: D. Triquetrum.**