Hand MMT

Question 1

Muscles involved MCP extension

Answer 1

extensor digitorum, extensor indicis, extensor digiti minimi

Question 2

Extensor digitorum OII

Answer 2

Origin: lateral epicondyle of humerus
insertion: extensor expansions of digits 2-5
innervation: deep radial nerve

Question 3

compensation for MCP extension

Answer 3

Tendonesis action of wrist flexors

Question 4

Muscles involved in MCP Flexion

Answer 4

lumbricals , interossei

Question 5

OII of lumbricals

Answer 5

Origin: FDP tendon
insertion: extensor expansions of digits 2-5
innervation: digits I and 2 = median nerve,
digits 3 and 4 = deep branch of ulnar nerve

Question 6

compensation of MCP flexion

Answer 6

leading with fingertips uses FDP and FDS

Question 7

Muscles involved in PIP flexion

Answer 7

flexor digitorum superficialis

Question 8

FDS OII

Answer 8

Origin: medial epicondyle of humerus, anterior radius
insertion: middle phalanges of digits 2-5
innervation: median nerve

Question 8

compensations of PIP flexion

Answer 8

If the DIP joints are not being held in extension, fingers will use FDP instead of FDS

Question 9

Muscles involved in DIP flexion

Answer 9

flexor digitorum profundus

Question 10

FDP OII

Answer 10

Origin: medial ulna and interosseus membrane
insertion: distal phalanges of digits 2-5
innervation: digits 2 and 3 = median nerve, digits 4 and 5 = ulnar nerve

Question 11

compensation of DIP flexion

Answer 11

1. if patient extends DIP joint then relaxes, it may look like active finger flexion
2. Tendonesis action of wrist extension

Question 12

Muscles involved in finger abduction

Answer 12

Dorsal interossei

Question 13

Dorsal interossei OII

Answer 13

Origin: sides of the metacarpals
insertion: extensor expansions of digits 2-4
innervation: deep branch of ulnar nerve

Question 14

compensations of finger abduction

Answer 14

Using finger extensors instead

Question 15

Muscles involved in finger adduction

Answer 15

Palmar interossei

Question 16

Palmar interossei OII

Answer 16

Origin.: palmar surfaces of metacarpals 2,4, and 5
insertion: extensor expansions of digits 2,4, and 5
innervation: deep branch of ulnar nerve

Question 17

Compensation of finger adduction

Answer 17

Use of finger flexors instead

Question 18

Muscles involved Thumb adduction

Answer 18

Adductor pollicis

Question 19

Adductor Policis OII

Answer 19

Origin: transverse head = shaft of 3rd metacarpal, oblique head = base of 2nd and 3rd metacarpal
insertion: medial side of base of thumb proximal phalanx
innervation: deep branch of ulnar nerve

Question 20

Compensation for grades 3-5 thumb adduction

Answer 20

if thumb clears the other fingers, thumb extensor would be used instead

Question 21

compensation for grade 2 thumb adduction

Answer 21

Using thumb flexors instead

Question 22

Muscles involved in thumb abduction

Answer 22

Abductor pollicis longus and abductor pollicis brevis

Question 23

Abductor pollicis brevis OII

Answer 23

Origin: flexor retinaculum, scaphoid, trapezium
insertion: lateral side of thumb proximal phalanx
innervation: recurrent branch of median nerve

Question 24

Compensation for thumb abduction using APL

Answer 24

Using extensors

Question 25

Compensation for thumb abduction using APB

Answer 25

bringing thumb out to the side would use APL

Question 26

Isolate APL

Answer 26

3,4,5= forearm in mid-position, thumb starting against index finger (adducted)
2=palm on table, thumb adducted

Question 27

isolate APB

Answer 27

3,4,5= palm facing up, thumb starting in line with index finger
2=hand in mid-position ,thumb starts next to index finger

Question 28

Muscles involved in opposition

Answer 28

opponens digiti minimi, opponens pollicis

Question 29

Opponens digiti minimi OII

Answer 29

origin: flexor retinaculum and hamate
insertion: medial border of 5th metacarpal
innervation: deep branch of ulnar nerve

Question 30

compensation of opposition

Answer 30

going tip to tip instead of pad to pad uses thumb and pinky flexors instead