Forearm Extensor Muscles Flashcards
Brachioradialis
O-Lateral supracondylar ridge of humerus
I-Lateral side of distal radius
N-Radial nerve
A-Flexor of the forearm (moves elbow joint)
Extensor Carpi Radialis Longus
O-Lateral supracondylar ridge of humerus
I-Proximal 2nd metacarpal
N-Radial nerve
A-Extension and abduction at wrist
Extensor Carpi Radialis Brevis
O-Lateral epicondyle of humerus
I-Proximal end of 3rd metacarpal
N-Radial nerve (deep branch)
A-Extension and abduction at wrist
Extensor Digitorum
O-Lateral epicondyle of humerus
I-Extensor expansions of 4 fingers
N-Radial nerve (posterior interosseous n.)
A-Extension of 4 fingers and extension of hand at wrist
Extensor Digiti Minimi
O-Lateral epicondyle of humerus
I-Extensor expansions of little finger
N-Radial nerve (posterior interosseous n.)
A-Extension of little finger
Extensor Carpi Ulnaris
O-Lateral epicondyle of humerus and posterior surface of ulna
I-Proximal end of 5th metacarpal
N-Radial nerve (posterior interosseous n.)
A-Extension and adduction at wrist
Supinator
O-Lateral epicondyle, supinator fossa, radial collateral & anular ligaments
I-Anterior, lateral and posterior surfaces of proximal radius
N-Radial nerve (deep branch)
A-Supination of forearm
Abductor Pollicis Longus
O-Posterior ulna, radius and interosseous m.
I-Proximal end of 1st metacarpal
N-Radial nerve (posterior interosseous n.)
A-Abducts and extends thumb
Extensor Pollicis Brevis
O-Posterior radius and interosseous membrane
I-Base of proximal phalanx of thumb
N-Radial nerve (posterior interosseous n.)
A-Extends thumb
Extensor Pollicis Longus
O-Posterior ulna and interosseous membrane
I-Base of distal phalanx of thumb
N-Radial nerve (posterior interosseous n.)
A-Extends thumb at MP (proximal joint) and IP (distal) joint
Extensor Indicis
O-Posterior ulna and interosseous membrane
I-Extensor expansion of index finger
N-Radial nerve (posterior interosseous n.)
A-Extends index finger
