An ulnar nerve is a major nerve in the upper limb that provides sensory and motor innervation to specific regions of the arm and hand. Originating from the brachial plexus in the neck, the ulnar nerve travels down the arm, passing through the medial aspect of the elbow and forearm. It plays a crucial role in the coordination and control of fine motor movements in the hand, particularly in the ring and little fingers. The ulnar nerve supplies sensory information to the skin on the ulnar side of the hand, including the little finger and half of the ring finger. Additionally, it innervates several muscles that are responsible for movements of the hand and fingers, such as those involved in gripping, pinching, and precise finger movements. Damage or compression of the ulnar nerve can lead to symptoms like numbness, tingling, weakness, and impaired dexterity in the affected hand and fingers.

英語での「ulnar nerve」の定義と意味

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