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Hamate bone of the left hand. Hamulus shown in red. The hook of hamate (Latin: hamulus) is found at the proximal, ulnar side of the hamate bone. The hook is a curved, hook-like process that projects 1–2 mm distally and radially. [5] The ulnar nerve hooks around the hook of hamate as it crosses towards the medial side of hand.
The ulnar nerve is a nerve that runs near the ulna, one of the two long bones in the forearm. ... and lying on the hook of hamate bone. It then turns laterally, ...
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 .
Pisiform, hook of the hamate, base of the fifth metacarpal bone (volar aspect) Artery: Ulnar artery: Nerve: Muscular branches of ulnar nerve (from C8 and T1) Actions: Flexion and adduction of wrist: Antagonist: Extensor carpi radialis brevis muscle and extensor carpi radialis longus muscle: Identifiers; Latin: musculus flexor carpi ulnaris ...
The deep branch of the ulnar nerve is a terminal, ... it lies in a fibrous tunnel formed between the hook of the hamate and the pisiform (Guyon's canal). Function
It connects the pisiform to the hook of the hamate. It is a prolongation of the tendon of the flexor carpi ulnaris. It serves as part of the origin for the abductor digiti minimi. It also forms the floor of the ulnar canal, a canal that allows the ulnar nerve and ulnar artery into the hand.
The ulnar canal or ulnar tunnel (also known as Guyon's canal or tunnel) is a semi-rigid longitudinal canal in the wrist that allows passage of the ulnar artery and ulnar nerve into the hand. [1] These are named after the ulna , the long bone on the little finger side of the arm.)
Hypothenar hammer syndrome (HHS) is a vascular occlusion in humans in the region of the ulna.It is caused by repetitive trauma to the hand or wrist (such as that caused by the use of a hammer) [2] by the vulnerable portion of the ulnar artery as it passes over the hamate bone, which may result in thrombosis, irregularity or aneurysm formation.
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