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Forearm: Posterior Compartment
Muscles
48
Anatomy
Professional
10/19/2011

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Term
What is the origin of brachioradialis muscle?
Definition
lateral supracondylar ridge of humerus
Term
What is the insertion of the brachioradialis muscle?
Definition
base of styloid process of radius
Term
What is the innervation of the brachioradialis muscle?
Definition
radial nerve
Term
What is the action of the brachioradialis muscle?
Definition
flexes forearm at elbow
Term
What is the origin of the extensor carpi radialis longus muscle?
Definition
lateral supracondylar ridge of humerus
Term
What is the insertion of the extensor carpi radialis longus?
Definition
base of 2nd metacarpal
Term
What is the innervation of the extensor carpi radialis longus?
Definition
radial nerve
Term
What is the action of extensor carpi radialis longus?
Definition
extends and abducts wrist
Term
What is the origin of extensor carpi radialis brevis?
Definition
lateral epicondyle of humerus
Term
What is the insertion of the extensor carpi radialis brevis?
Definition
base of 3rd metacarpal bone
Term
What is the innervation of extensor carpi radialis brevis?
Definition
deep branch of radial nerve
Term
What is the action of the extensor carpi radialis brevis?
Definition
extends and abducts wrist
Term
What is the origin of the extensor digitorum muscle?
Definition
lateral epicondyle of humerus
Term
What is the insertion of the extensor digitorum?
Definition
4 tendons in extensor expansion and distal phalanges of 2-5 fingers
Term
What is the innervation of the extensor digitorum muscle?
Definition
deep branch of radial nerve
Term
What is the action of the extensor digitorum?
Definition
extends fingers and hand
Term
What is the origin of the extensor carpi ulnaris?
Definition
lateral epicondyle of humerus
Term
What is the insertion of extensor carpi ulnaris?
Definition
base of 5th metacarpal
Term
What is the innervation of extensor carpi ulnaris?
Definition
deep branch of radial nerve
Term
What is the action of the extensor carpi ulnaris?
Definition
extends and adducts wrist
Term
What is the origin of the extensor digiti minimi muscle?
Definition
lateral epicondyle of humerus
Term
What is the insertion of the extensor digiti minimi muscle?
Definition
extensor expansion of little finger
Term
What is the innervation of the extensor digiti minimi?
Definition
deep branch of radial nerve
Term
What is the action of the extensor digiti minimi muscle?
Definition
extends metacarpophalangeal joint of little finger
Term
What is the origin of the abductor pollicis longus?
Definition
posterior radial and ulnar shafts
Term
What is the insertion of the abductor pollicis longus?
Definition
base of 1st metacarpal
Term
What is the innervation of the abductor pollicis longus?
Definition
deep branch of radial nerve
Term
What is the action of the abductor pollicis longus?
Definition
abducts and extends thumb
Term
What is the origin of the extensor pollicis longus muscle?
Definition
posterior shaft of ulna
Term
What is the insertion of extensor pollicis longus?
Definition
base of distal phalanx of thumb
Term
What is the innervation of deep branch of radial nerve?
Definition
deep branch of radial nerve
Term
What is the action of the extensor pollicis longus?
Definition
extends distal phalanx of thumb
Term
What is the origin of the extensor pollicis brevis?
Definition
posterior shaft of radius
Term
What is the insertion of the extensor pollicis brevis?
Definition
base of proximal phalanx of thumb
Term
What is the innervation of the extensor pollicis brevis?
Definition
deep branch of the radial nerve
Term
What is the action of the extensor pollicis brevis?
Definition
extends metacarpophalangeal joint of thumb
Term
What is the origin of the extensor indicis?
Definition
posterior distal ulnar shaft
Term
What is the insertion of the extensor indicis?
Definition
extensor expansion of index finger
Term
What is the innervation of the extensor indicis?
Definition
deep branch of radial nerve
Term
What is the action of the extensor indicis?
Definition
extends metacarpophalangeal joint of index finger
Term
What is the origin of the supinator muscle?
Definition
lateral epicondyle of humerus and proximal ulna
Term
What is the insertion of the supinator muscle?
Definition
proximal end of radius
Term
What is the innervation of supinator muscle?
Definition
deep branch of radial nerve
Term
What is the action of the supinator muscle?
Definition
supinates forearm
Term
What is the origin of the anconeus?
Definition
lateral epicondyle of humerus
Term
What is the insertion of the anconeus muscle?
Definition
olecranon process of ulna and superior part of posterior surface of ulna
Term
What is the innervation of the anconeus?
Definition
radial nerve
Term
What is the action of the anconeus?
Definition
extends elbow
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