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Ulnar tunnel syndrome, also known as Guyon's canal syndrome or Handlebar palsy, is ulnar neuropathy at the wrist where it passes through the ulnar tunnel (Guyon's canal). [1] The most common presentation is a palsy of the deep motor branch of the ulnar nerve causing weakness of the interosseous muscles .
This commonly results from weakness of some of the ulnar nerve innervated intrinsic hand muscles-in particular the palmar interosseous muscle to the little finger- caused by damage to their nerve supply (denervation). There may be different causes for this denervation and muscle imbalance including:
The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest in the human body unprotected by muscle or bone, so injury is common. [ 1 ] This nerve is directly connected to the little finger , and the adjacent half of the ring finger , innervating the palmar aspect of these fingers, including both ...
Ulnar neuropathy is a disorder involving the ulnar nerve. Ulnar neuropathy may be caused by entrapment of the ulnar nerve with resultant numbness and tingling. [3] It may also cause weakness or paralysis of the muscles supplied by the nerve. Ulnar neuropathy may affect the elbow as cubital tunnel syndrome.
Ulnar neuropathy at the cubital tunnel is diagnosed based on characteristic symptoms and signs. Intermittent or static numbness in the small finger and ulnar half of the ring finger, weakness or atrophy of the first dorsal interosseous, positive Tinel sign over the ulnar nerve proximal to the cubital tunnel, and positive elbow flexion test (elicitation of paresthesia in the small and ring ...
The dorsal branch of the ulnar nerve divides into two dorsal digital branches; one supplies the ulnar side of the little finger; the other, the adjacent sides of the little and ring fingers. It also sends a twig to join that given by the superficial branch of the radial nerve for the adjoining sides of the middle and ring fingers, and assists ...
The common palmar digital nerves of the ulnar nerve are nerves of the hand. The nerve branches off the superficial branch of the ulnar nerve and runs toward the cleft between the ring and little fingers.
The superficial head is usually innervated by the recurrent branch of the median nerve. [5] The deep part is often innervated by the deep branch of ulnar nerve (C8 and T1 roots). [6] [7] There are normal variations. In a Cannieu-Riche anastomosis, fibers from the deep branch of ulnar nerve innervate the opponens pollicis and/or abductor ...