Hand Muscles

Question 1

Extrinsic Muscles of hand?

Answer 1

extrinsic = anterior and posterior forearm

Question 2

Intrinsic Muscles of the hand?

Answer 2

1. Thenar group (3)
2. Hypothenar group (4)
3. Central group (4)

Question 3

What muscles are in the thenar group?

Answer 3

1. Abductor Pollicis Brevis
2. Flexor Pollicis Brevis
3. Opponens Pollicis

Question 4

What nerve innervates the thenar group?

Answer 4

Median n

Question 5

What muscles are in the hypothenar group?

Answer 5

1. Palmaris Brevis
2. Abductor Digiti Minini
3. Flexor Digiti Minini Brevis
4. Opponents digiti minini

Question 6

What nerve innervates the hypothenar group?

Answer 6

ulnar n.

Question 7

What muscles are in the central group?

Answer 7

1. Lumbricals (4)
2. Dorsal interosseous (4)
3. Palmar interosseous (3)
4. Adductor Pollicis

Question 8

What nerve innervate the central group?

Answer 8

Ulnar n
Exception: Lumbricals 1& 2 = medial n

Question 9

Common origin of thenar group?

Answer 9

Flexor retinaculum & carpal bones

Question 10

Abductor Pollicis Brevis O, I & function?

Answer 10

O: Flexor retinaculum, scaphoid & trapezium
I: Base of proximal phalanx
F: abduction of thumb

Question 11

Flexor Pollicis Brevis O, I & function?

Answer 11

O: Flexor retinaculum & trapezium
I: Base of of proximal phalanx
F: flexion of thumb (CMC & MCP)

Question 12

Opponens Pollicis O, I & function?

Answer 12

O: Flexor retinaculum & trapezium
I: 1st metacarpal
F: opposition of thumb

Question 13

Palmaris Brevis O, I & function?

Answer 13

O: Palmer aponeurosis
I: Skin of medial hand
F: Wrinkle skin (improve grip)

Question 14

Abductor Digiti Minini O, I & function?

Answer 14

O: Pisiform
I: Base of proximal phalanx 5
F: Abduct pinky

Question 15

Flexor Digiti Minini Brevis O, I & function?

Answer 15

O: flexor retinaculum & hook of hamate
I: base of proximal phalanx 5
F: flex pinky

Question 16

Opponens Digiti Minini O, I, & function?

Answer 16

O: flexor retinaculum & hook of hamate
I: 5th metacarpal
F: opposition of pinky

Question 17

Adductor Pollicis O, I & function? (2 heads)

Answer 17

O:
Oblique head: Base of 2 & 3rd metacarpals
transverse head: capitate
I: base of proximal phalanx
F: adduction of thumb

Question 18

Adductor Pollicis - 2 facts

Answer 18

1. Forms most of bulk of 1st web - palmer side
2. tendon has sesamoid bone

Question 19

Lumbricals O, I & function?

Answer 19

O: Tendons of FDP
I: Dorsal digital expansion 2 - 5
Function: “TATA”
1. Flexion of MCP
2. Extension of PIP & DIP

**lumbrical 1 is on digit 2
lumbrical 2 is on digit 3 etc

Question 20

Dorsal Interosseous muscle O, I & function?

Answer 20

O: adjacent sides of metacarpals
I: base of proximal phalanges & dorsal digital expansion of digits 2-5
Function:
1. Abduction @ MCP
TATA:
2. Flexion @ MCP
3. Extension @ PIP & DIP

DAB*

Question 21

Palmar Interosseous muscle O, I & function?

Answer 21

O: anterior side of metacarpals
I: base of proximal phalanges & dorsal digital expansion of 2,4 & 5
Function:
1. Adduction @ MCP 2, 4 & 5
TATA:
2. Flexion @ MCP 2, 4 & 5
3. Extension @ PIP & DIP

PAD

Question 22

Carpal bones?

Answer 22

Lateral to medial, 1st row, 2nd row:
Scaphoid, lunate, triquetrum, pisiform
Trapezium, Trapezoid, Capitate, Hamate

** Some Lovers Try Positions, That They Cannot Handle **

Question 23

What carpal bones make the carpal arch?

Answer 23

everything except scaphoid & lunate

SO FROM LATERAL TO MEDIAL:
Trapezium Trapezoid Capitate Hamate Triquetrium Pisiform

Question 24

What passes through carpal tunnel?

Answer 24

1. Median N
2. Flexor digitorum superficialis (4)
3. Flexor digitorum profundus (4)
4. Flexor polices longus (1)

Question 25

What tendon passes through Flexor Retinaculum?

Answer 25

Flexor carpi radialis