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Intrinsic muscles of the hand innervated by MEDIAN Nerve
-Abductor pollicis brevis (palmar Abduction)-Opponens pollicis (opposition)-Flexor pollicis brevis (thumb MCP flexion)-Lumbricals radial side IF & MF (MCP flexion, IP extension)
Median nerve damage at the wrist will cause difficulty with:
Abduction, opposition & MCP flexion of the thumbMCP flexion & IP extension of index & middle fingers
*Pinch, 3 jaw chuck
Extrinsic flexor hand muscles innervated by the median nerve
-(FDS) Flexor digitorum superficialis (PIP flexion)-(FDP) flexor digitorum profundus (DIP flexion)-FPL (flexor pollicis longus) (thumb IP flexion)
Median Nerve damage at the elbow will cause difficulty with:
Finger PIP and DIP flexion, thumb IP flexion
*Hook Grasp
*Fine motor precision
*Gross grasp
Intrinsic hand muscles innervated by ulnar nerve
* Abductor digiti minimi (little finger ABduction)
* Opponens digiti minimi (Little finger opposition)
* Flexor digiti minimi (Little finger MCP flexion, opposition)
* Adductor (adducts thumb CMC)
* Lumbricals - Ulnar side(LF and RF MCP flexion & IP extension
* Palmar interossei (Digits 2-5 adduction, MCP flexion, IP extension
*Dorsal Interossei (Digits 2-5 ABduction, MCP flexion, IP extension)
Extrinsic hand flexors innervated by Ulnar nerve
* FDP Flexor digitorum profundus (LF and RF DIP flexion)
Extrinsic hand extensors innervated by Radial nerve
* EDC Extensor digitorum communis (Extension of MCPs, helps with extension of IPs)
* EDM Extensor digiti minimi (LF MCP extension, helps with IP extension
* EIP Extensor indicis proprius (IF MCP & IP extension)
* EPL Extensor pollicis longus (Thumb IP extension)
* EPB Extensor pollicis brevis (thumb MCP, CMC extension)
* APL ABductor pollicis longus (Thumb CMC abduction & extension)
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