On an axial section through the wrist at the level of the hook of hamate, a structure is identified in the fibro-osseous canal formed by the pisiform and hamate, deep to the palmar carpal ligament but outside the carpal tunnel proper. This structure is the:

• A Median nerve
• B Ulnar nerve ✓
• C Flexor pollicis longus tendon
• D Radial artery

Explanation

Guyon's canal, bounded by the pisiform and hook of hamate with the palmar carpal ligament roof, transmits the ulnar nerve and artery into the hand; it lies superficial to the flexor retinaculum and outside the carpal tunnel. The median nerve lies within the carpal tunnel beneath the flexor retinaculum, the flexor pollicis longus tendon is also inside the tunnel, and the radial artery travels laterally through the anatomical snuffbox region.

Reference: Gray's Anatomy for Students, 4th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.