anatomy - back of forearm
Post on 23-Jan-2018
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There are two groups of muscles at
the back of forearm.
1. Superficial Muscle group
2. Deep Muscle group
There are seven muscles in the
superficial group.
1. Anconeus
2. Brachioradialis
3. Extensor carpi radialis longus
4. Extensor carpi radialis brevis
5. Extensor digitorum
6. Extensor digiti minimi
7. Extensor carpi ulnaris
Action:
1. Not a prime mover in any
joint action;
2. Assists in elbow extension
Nerve supply:
Radial nerve (C7, C8)
Origin:
Lateral epicondyle
of the humerus
Insertion:
Base of distal
phalanx of the second
through fifth fingers
Action:Extends all three joints of the
fingers (MCP, PIP, and DIP)
Nerve supply:Radial nerve (C6, C7, C8)
Action:Extends all three joints of fifth
finger (MCP, PIP, and DIP)
Nerve supply:Radial nerve (C6, C7, C8)
There are 5 muscles in the deep muscle
group.
1. Supinator
2. Abductor pollicis longus
3. Extensor pollicis brevis
4. Extensor pollicis longus
5. Extensor indicis
Origin:Lateral epicondyle of
humerus and adjacent ulna
Insertion:Anterior surface of the
proximal radius
Action:Extends all three joints of the
thumb (CMC, MCP, and IP)
Nerve supply:Radial nerve (C6, C7, C8)
Action:Extends all three joints of
the second finger (MCP, PIP, and
DIP)
Nerve supply:Radial nerve (C6, C7, C8)
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