Guyon's canal, also known as the ulnar canal, is a narrow passageway in the wrist that allows the ulnar nerve and artery to pass from the forearm into the hand. It plays a crucial role in the motor and sensory functions of the hand, particularly affecting the little finger and part of the ring finger.

Guyon's Canal

Ulnar canal

Narrow passageway in the wrist

The ulnar nerve is a critical nerve in the human body responsible for innervating the forearm and hand, particularly affecting the muscles and skin on the ulnar side. It is commonly associated with the 'funny bone' sensation when compressed and is susceptible to entrapment syndromes, such as cubital tunnel syndrome, leading to symptoms like numbness and tingling in the ring and little fingers.

Ulnar Nerve

The ulnar artery is a major blood vessel of the forearm that supplies oxygenated blood to the medial aspect of the forearm and hand, playing a crucial role in the circulatory system of the upper limb. It is commonly used in medical procedures such as arterial cannulation and is an important consideration in surgeries involving the arm and hand due to its proximity to other critical structures.

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