MM of forearm and hand

Question 1

extensor carpi radialis longus and brevis

Answer 1

O: common extensor origin - lateral epicondyle of humerus
I:
ECRL - base of 2nd metacarpal
ECRB - base of 3rd metacarpal
A: wrist extension and radial deviation
I: radial

Question 2

extensor digitorum

Answer 2

O: common extensor origin - lateral epicondyle of humerus
I: by 4 tendons, each to base of extensor mechanism, and to dorsal base of proximal phalanx of fingers
A: extends MCP joints, extends IP joints of 2-5 digits
I: radial

Question 3

extensor digiti minimi

Answer 3

O: ulnar side of belly of extensor digitorum
I: tendon usually divides, joining ulnar side of tendon of extensor digitorum
A: extends MCP joints, extends IP joints of little finger
I: radial

Question 4

extensor carpi ulnaris

Answer 4

O: common extensor origin- lateral epicondyle of humerus
I: base of 5th metacarpal
A: extension of wrist and ulnar deviation
I: radial

Question 5

abductor pollicis longus

Answer 5

O: post surface of middle part of radius and ulna, and adjacent interosseous membrane
I: base of 1st metacarpal
A: 1st digit ABD and extension at CMC joint
I: radial

Question 6

extensor pollicis brevis

Answer 6

O: post surface of middle to distal parts of radius and adj interosseous membrane
I: proximal phalanx of thumb
A: 1st digit extension at MCP, IP joints
I: radial

Question 7

extensor pollicis longus

Answer 7

O: post surface of middle part of ulna and adj. interosseous membrane
I: distal phalanx of thumb
A: 1st digit extension at MCP, IP joints
I: radial

Question 8

extensor indicis

Answer 8

O: post surface of middle to distal part of ulna and adj interosseous membrane
I: tendon blends with ulnar side of index tendon of extensor digitorum
A: 2nd digit extension and wrist extension
I: radial

Question 9

supinator

Answer 9

O: lateral epicondyle of humerus and supinator crest of ulna
I: lateral surface of prox radius
A: forearm supination
I: radial

Question 10

pronator teres

Answer 10

O:
humeral head: medial epicondyle
ulnar head: medial to tuberosity of ulna
I: lateral surface of middle radius
A: forearm pronation, elbow flexion
I: median

Question 11

flexor carpi radialis

Answer 11

O: common flexor origin- medial epicondyle of humerus
I: 2nd and 3rd metacarpals
A: wrist flexion, radial deviation
I: median

Question 12

palmaris longus

Answer 12

O: common flexor origin- medial epicondyle of humerus
I: carpal ligament and palmar aponeurosis of hand
A: wrist flexion
I: median

Question 13

flexor carpi ulnaris

Answer 13

O:
Humeral head: Common
flexor origin- medial
epicondyle of the humerus
Ulnar head: posterior border
of the middle one third of
the ulna
I: Pisiform bone, pisohamate and
pisometacarpal ligaments, and
palmar base of the fifth metacarpal
bone
A: wrist flexion, ulnar deviation
I: ulnar

Question 14

flexor digitorum superficialis

Answer 14

O:
Humeroulnar head:
common flexor origin, and
the medial side of coronoid
process of the ulna
Radial head: oblique line
just distal and lateral to the bicipital tuberosity
I: By four tendons, each to the sides
of the middle phalanges of the
fingers
A: flexion of PIP joint of fingers
I: median

Question 15

flexor pollicis longus

Answer 15

O: Middle part of the anterior
surface of the radius and
adjacent interosseous
membrane
I: dist phalanx of thumb
A: flexion of distal phalanx of thumb
I: median

Question 16

flexor digitorum profundus

Answer 16

O: Proximal 3/4 of the medial
side of the ulna and
adjacent interosseous
membrane
I: By four tendons, each to the palmar
base of the distal phalanges of the
fingers
A: wrist flexion, flex all joints to DIP in digits 2-5
I:
medial half - ulnar
lateral hald - median

Question 17

pronator quadratus

Answer 17

O: ant surface of dist ulnar
I: ant surface of dist radius
A: forearm pronation
I: median

Question 18

abductor pollicis brevis

Answer 18

O: palmar tubercles of trapezium and scaphoid
I: base of proximal phalanx of thumb
A: abduction of thumb at MCP, and CMC
I: median

Question 19

flexor pollicis brevis

Answer 19

O: transverse carpal ligament and palmar tubercle of trapezium
I: radial side of prox phalanx of thumb
A: thumb flexion
I: median

Question 20

opponens pollicis

Answer 20

O: transverse carpal lig and palmar tubercle of trapezium
I: shaft of thumb metacarpal
A: opposition of thumb
I: median

Question 21

adductor pollicis

Answer 21

O:
Oblique head: capitate
bone& base of second and
third metacarpal
Transverse head: palmar
surface of 3rd metacarpal
I: ulnar side of base of prox phalanx of thumb
A: thumb adduction
I: ulnar

Question 22

abductor digiti minimi

Answer 22

O: pisiform bone and tendon of FCU
I: base of prox phalanx of little finger
A: abd little finger at MCP
I: ulnar

Question 23

flexor digiti minimi

Answer 23

O: hook of hamate
I: base of prox phalanx of little finger
A: flexion of little finger
I: ulnar

Question 24

opponens digiti minimi

Answer 24

O: transverse carpal lig and hook of hamate
I: shaft of 5th metacarpal
A: flexion of 5th metacarpal, ER producing opposition
I: ulnar

Question 25

lumbricals of hand

Answer 25

O:
First and second: Radial
surface of the flexor
profundus tendons of the
index and middle fingers,
respectively.
Third: Adjacent sides of the
flexor profundus tendons of
the middle and ring fingers.
Fourth: Adjacent sides of
the flexor profundus
tendons of the ring and little
fingers
I: Into the radial border of the extensor
expansion on the dorsum of the
respective digits
A: MCP flexion, IP extension
I: medial 2 - ulnar
lateral 2 - median

Question 26

dorsal interossei

Answer 26

O:
First: adjacent sides of the
first and second
metacarpal
Second: adjacent sides of
the second and third
metacarpal
Third: adjacent sides of the
third and fourth metacarpal
Fourth: adjacent sides of
the fourth and fifth
metacarpal
I:
First: Radial side of the index
finger, chiefly to the base of the
proximal phalanx
Second: Radial side of the middle
finger
Third: Ulnar side of the middle
finger, chiefly into extensor
expansion
Fourth: Ulnar side of the ring finger
A: abduct 2,3,4 digits away from middle finger
I: ulnar