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Ulnar Nerve
From WikiMSK
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| Ulnar Nerve | |
|---|---|
| Nerve Type | Mixed nerve |
| Major Branches | Dorsal sensory branch of the ulnar nerve (5-6cm proximal to ulnar styloid) |
| Sensory innervation | Palmar and dorsal sides of medial half of the fourth finger, entire fifth finger, and ulnar border of the hand. |
Clinical Relevance
Importantly, the ulnar nerve doesn't provide sensation to the medial forearm. That is innervated by the Medial Antebrachial Cutaneous Nerve. Therefore, an ulnar lesion at the elbow results in anaesthesia of the ulnar hand and fingers, but not the forearm.
Nerve compression in the Guyon canal results in anaesthesia of the ventral palm and fifth finger. Dorsal sensation is supplied by the dorsal sensory branch of the ulnar nerve.
