Ulnar Nerve Function: Finger Flexion and Thumb Movement
The ulnar nerve innervates:
- Forearm flexors (flexor carpi ulnaris, medial half of flexor digitorum profundus) → wrist and finger flexion.
- Intrinsic hand muscles (interossei, lumbricals 3&4, thenar eminence deep head, adductor pollicis) → finger abduction/adduction, thumb adduction, fine motor control.
Ulnar nerve compression (cubital tunnel, Guyon's canal) causes weakness in these actions, claw hand deformity, and sensory loss in the medial hand and digits 4–5.
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