Muscles Flashcards
1
Q
Supinator
A
O = lateral epicondyle and ulnar I = upper third of radius a = supinates forearm Inn = deep branch of radial nerve
2
Q
First volar interosseous muscle
A
O = length of second MC I = base of proximal phalanges A = adducts flexes mcp and extends ip's of IF Inn = deep branch of ulnar nerve
3
Q
Extensor Carpi Ulnaris
A
O = lateral epicondyle common extensor tendon I = base of 5 th MC A = extends wrist and ulnar deviates wrist inn = PIN (radial nerve)
4
Q
Abductor pollicis Brevis
A
O = transverse carpal ligament, scaphoid and trapezium I = radial base of prox phalanx of thumb and thumb ext A = abducts thumb: assists in opposition and extension of thumb Inn = recurrent branch of median nerve
APB is the strongest muscle in opposition
5
Q
First dorsal interosseous
A
O = radial edge of 2nd MC I = base of proximal phalanx of IF A = abduct finger Inn = deep branch of ulnar nerve
6
Q
Adductor Pollicus
A
O = transverse head - anterior body third MC oblique head- bases of the second and third MC and trapeziod and capitate I = ulnar side of prox phalanx of thumb A = adducts thumb Inn = deep branch of ulnar nerve (t1)
7
Q
Extensor Carpi radialis Brevis
A
O = common ext tendon I = base of third MC A = wrist extension and radial deviation Inn = radial
8
Q
Extensor pollicis Longus
A
O = middle third posterior ulnar and interosseous membrane I = first distal phalanx A= extension of thumb MCPJ AND IPJ Inn = PIN radial nerve
9
Q
Palmaris Brevis
A
O = flexor retinaculum and palmar aponeurosis I = Palm A= pulls skin over hypo thenar eminence deepens cup of hand and improves grip Inn = superficial branch of ulnar nerve
10
Q
Pronator quadratus
A
O =medial anterior surface of ulnar
I = lateral anterior surface of radius
A= pronation of forearm
Inn= AIN median nerve
11
Q
Extensor indices proprius
A
O= posterior distal third of ulnar and interosseous membrane I = extensor hood of IF A = extends IF and wrist Inn = PIN
12
Q
Brachioradialis
A
O = lateral supra condylar ridge of humerus
I = distal radius radial styloid
A = flexion of elbow and supination when elbow extended
Inn = radial nerve
When pronated it is more active during flexion as biceps brachii is at a mechanical disadvantage
13
Q
Lumbricales
A
O= FDP TENDONS I = extensor expansion of EDC A= extend IPJ's ( weak MCPJ flexor so)
