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File information Description Ulnar tunnel syndrome, or Guyon's canal syndrome, can cause pain and paraesthesia in the distribution of the ulnar nerve.
The proper palmar digital nerves of the ulnar nerve are nerves of the hand.. The superficial branch of the ulnar nerve divides into a proper palmar digital nerve, which supplies the medial side of the fifth digit and a common palmar digital nerve which divides into two proper palmar digital nerves that supply the adjacent sides of the fourth and fifth digits.
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. [1]
The palmar branch represents the continuation of the ulnar nerve as it crosses the flexor retinaculum of the hand on the lateral side of the pisiform bone, medial to and a little behind the ulnar artery. Some sources state that it ends by dividing into a superficial and a deep branch. [1]
It supplies the palmaris brevis and the skin on the ulnar side of the hand. [2] [3] It also divides into a common palmar digital nerve and a proper palmar digital nerve. [2] The proper digital branches are distributed to the fingers in the same manner as those of the median nerve.
The ulnar nerve can suffer injury anywhere between its proximal origin of the brachial plexus all the way to its distal branches in the hand. It is the most commonly injured nerve around the elbow. [ 9 ] [ 10 ] Although it can be damaged under various circumstances, it is commonly injured by local trauma or physical impingement ("pinched nerve").
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 .
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 ...