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Muscles Affecting the Motion of the Hand
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George ElKoura -- July 3, 2002
Information gathered mostly from
e-hand.com
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Forearm Muscles (Extrinsic)
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| Muscle |
Affected Finger(s) |
Flexed Joints |
Extended Joints |
Abducted Joints |
Adducted Joints |
| Abductor Pollicis Longus |
Thumb |
|
|
Basal Joint |
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| Flexor Pollicis Longus |
Thumb |
IP, MCP (weakly) |
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| Extensor Pollicis Brevis |
Thumb |
|
MCP |
Basal Joint (weakly) |
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| Extensor Pollicis Longus |
Thumb |
|
IP |
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| Extensor Indicis |
Index |
|
MCP, PIP |
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| Extensor Digiti Minimi |
Pinky |
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MCP, PIP, CMC (when MCP and PIP are flexed) |
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| Extensor Digitorum |
Index, Middle, Ring, Pinky |
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MCP, PIP |
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| Flexor Digitorum Superficialis |
Index, Middle, Ring, Pinky |
PIP, MCP (after flexion initiated) |
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| Flexor Digitorum Profundus |
Index, Middle, Ring, Pinky |
DIP, PIP, MCP (after flexion initiated) |
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Hand Muscles (Intrinsic)
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| Muscle |
Affected Finger(s) |
Flexed Joints |
Extended Joints |
Abducted Joints |
Adducted Joints |
| Index Lumbrical |
Index |
MCP |
PIP, DIP |
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| Middle Lumbrical |
Middle |
MCP |
PIP, DIP |
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| Ring Lumbrical |
Ring |
MCP |
PIP, DIP |
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| Small Lumbrical |
Pinky |
MCP |
PIP, DIP |
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| First Dorsal Interosseous |
Index, Thumb |
Index MCP |
Index PIP, DIP (weakly) |
Index MCP |
Thumb Basal Joint |
| Second Dorsal Interosseous |
Middle |
MCP |
PIP, DIP |
MCP |
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| Third Dorsal Interosseous |
Middle |
MCP |
PIP, DIP |
MCP |
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| Fourth Dorsal Interosseous |
Ring |
MCP |
PIP, DIP |
MCP |
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| First Palmar Interosseous |
Index |
MCP |
PIP, DIP |
|
MCP |
| Second Palmar Interosseous |
Ring |
MCP |
PIP, DIP |
|
MCP |
| Third Palmar Interosseous |
Pinky |
MCP |
PIP, DIP |
|
MCP |
| Abductor Pollicis Brevis |
Thumb |
|
IP |
Basal Joint |
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| Adductor Pollicis |
Thumb |
|
IP |
|
Basal Joint |
| Abductor Digiti Minimi |
Pinky |
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MCP |
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| Opponens Digiti Minimi |
Pinky |
CMC |
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| Flexor Digiti Minimi |
Pinky |
CMC, MCP |
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| Flexor Pollicis Brevis |
Thumb |
MCP, Basal Joint |
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| Opponens Pollicis |
Thumb |
Basal Joint |
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