Lab 4 Flashcards
What is this muscle? List the origin, insertion, innervation, and action.
Anconeus
O: lateral epicondyle of the humerus
I: lateral surface of the olecranon and superior part of posterior surface of ulna
N: radial
A: extension of forearm, stabilization of elbow joint
What muscle is this? List the origin, insertion, innervation, action.
Extensor Radialis Longus
O: lateral supracondylar ridge
I: base of 2nd metacarpal
N: radial
A: extension and abduction of hand at the wrist
What muscle is this? List the origin, insertion, innervation, and action.
Extensor Capri Radialis Brevis
O: lateral epicondyle
I: base of 3rd metacarpal
N: deep branch of radial nerve
A: extension and abduction of the hand at the wrist
What muscle is this? List the origin, insertion, innervation, and action.
Extensor Digitorum
O: lateral epicondyle
I: extensor expansion of medial 4 digits
N: posterior interosseous
A: extension of medial 4 digits at MCP, and extension at IP joint, extension at wrist
What muscle is this? List the origin, insertion, innervation, action.
Extensor digiti minimi
O: lateral epicondyle
I: extensor expansion of 5th digit
N: posterior interosseous
A: extension of 5th digit at MCP, extension at IP, extension at wrist
What muscle is this? List the origin, insertion, innervation, and action.
Extensor capri ulnaris
O: lateral epicondyle, posterior border of ulna via aponeurosis
I: base of 5th metacarpal
N: posterior interosseous
A: extension and adduction of hand at wrist
Where is the supinator? List the origin, insertion, innervation, and action.
O: lateral epicondyle, supinator fossa, crest of ulna
I: lateral, posterior, anterior surface of proximal 3rd radius
N: deep branch of radial nerve
A: supination of the forearm
What muscle is this? List the origin, insertion, innervation, and action.
Extensor Indicis
O: posterior surface of ulna, interosseous membrane
I: extensor expansion of 2nd digit
N: posterior interosseous
A: extension at the MCP, extension at IP, extension of hand at wrist
What muscle is this? List the origin, insertion, innervation, action.
Abductor pollicis longus
O: posterior surface of ulna and radius, interosseous membrane
I: base of 1st metacarpal
N: posterior interosseous
A: abduction of 1st digit, extension at MCP, extension at wrist
Where is the extensor pollicis longus? List the origin, insertion, innervation, action.
O: posterior surface of middle 3rd ulna, interosseous membrane
I: base of distal phalanx of 1st digit
N: posterior interosseous
A: extension of MCP and IP joints, extension at wrist
Where is the extensor pollicis brevis? LIst the origin, insertion, innervation, and action.
O: posterior surface of the radius, interosseous membrane
I: base of proximal phalanx of 1st digit
N: posterior interosseous
A: extension of MCP joint
What does this show? Which muscles make the boundaries?
Anatomical snuff box
lateral: extensor pollicis brevis
medial: extensor pollicis longus
