Superficial and deep muscles of posterior forearm Flashcards
What are the 5 deep muscles of the posterior forearm?
supinator
abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus
extensor indicis proprius
What nerve supplies all of the muscles in the posterior forearm?
Radial nerve
Where is brachioradialis, and what are its origin and attachment sites?
7, brachioradialis originates from lateral supracondylar ridge of humerus and attaches to distal, lateral surface of radius just before radial styloid process
What is the action of the brachioradialis?
Elbow flexion
Where is extensor carpi radialis longus, and what are its origin and attachment sites?
1, it originates from lateral supracondylar ridge of humerus and becomes a tendon to attach to base of 2nd metacarpal
What are the 2 actions of extensor carpi radialis longus?
Wrist abduction
Wrist extension
Where is extensor carpi radialis brevis, and what are its origin and attachment sites?
2, originates from lateral epicondyle of humerus and becomes a tendon to attach to base of 3rd metacarpal
What are the 2 actions of extensor carpi radialis brevis?
Wrist abduction
Wrist extension
Where is extensor digitorum communis, and what are the origin and attachment sites?
10, originates from lateral epicondyle of humerus than splits into 4 tendons in distal forearm, each tendon attaches to extensor hood of a finger
Extensor hood surrounds distal metacarpal head and proximal phalange
What are the 2 actions of extensor digitorum communis?
Extension of metacarpophalangeal joints
Extension of interphalangeal joints
(Main extensor of fingers)
Where is extensor digiti minimi, and what are the origin and attachment sites?
9, originates from lateral epicondyle of humerus and joins with extensor digitorum tendon to attach to extensor hood of little finger
What are the 2 actions of extensor digiti minimi?
Extension of little finger (main action)
Wrist extension (weak action)
Where is extensor carpi ulnaris, and what are the origin and attachment sites?
8, originates from lateral epicondyle of humerus and attaches to base of 5th metacarpal
What are the 2 actions of extensor carpi ulnaris?
Wrist extension
Wrist adduction
Where is anconeus, and what are the origin and attachment sites?
11, originates from lateral epicondyle of humerus and attaches to posterolateral surface of olecranon process