Where does the ulnar nerve pass through the wrist?

Where does the ulnar nerve pass through the wrist?

• A. Distal forearm
• B. Through carpal tunnel
• C. Through the radial groove
• D. Where ulnar nerve passes through the wrist

Answer: (D)

At the wrist, the ulnar nerve travels through a dedicated passage on the ulnar side called Guyon's canal (ulnar canal). It does not pass through the carpal tunnel; that space is for the median nerve and flexor tendons. Instead, as the nerve reaches the wrist, it runs through this canal between the pisiform and the hook of the hamate, under the pisohamate ligament, and then divides into a superficial branch (primarily sensory to the medial one and a half fingers) and a deep branch (motor to many intrinsic hand muscles). The other options point to structures or routes that do not apply to the ulnar nerve at the wrist.

At the wrist, the ulnar nerve travels through a dedicated passage on the ulnar side called Guyon's canal (ulnar canal). It does not pass through the carpal tunnel; that space is for the median nerve and flexor tendons. Instead, as the nerve reaches the wrist, it runs through this canal between the pisiform and the hook of the hamate, under the pisohamate ligament, and then divides into a superficial branch (primarily sensory to the medial one and a half fingers) and a deep branch (motor to many intrinsic hand muscles). The other options point to structures or routes that do not apply to the ulnar nerve at the wrist.