Palmar Aspect of the Hand

Question 1

What are the thenar muscles of the hand?

Answer 1

Intrinsic muscles of the thumb. Form the thinner eminence. Abductor pollicis brevis, Flexor pollicis brevis, Opponens pollicis

Question 2

Abductor pollicis brevis origin

Answer 2

Flexor retinaculum

Question 3

Abductor pollicis brevis insertion

Answer 3

Base of the proximal phalanx of the thumb

Question 4

Abductor pollicis primary action

Answer 4

Abducts the thumb

Question 5

Flexor pollicis brevis origin

Answer 5

Flexor retinaculum

Question 6

Flexor pollicis brevis insertion

Answer 6

Base of the proximal phalanx of the thumb

Question 7

Flexor pollicis brevis primary action

Answer 7

Flexes the CM and MP joints of the thumb

Question 8

Opponens pollicis origin

Answer 8

Flexor retinaculum

Question 9

Opponens pollicis insertion

Answer 9

Lateral shaft of the 1st metacarpal

Question 10

Oppenens pollicis primary action

Answer 10

Oppose the thumb

Question 11

What are the hypothenar muscles?

Answer 11

Intrinsic muscles of digit 5. Form the hypothenar eminence. Abductor digiti minimi, Flexor digiti minimi, Opponens digit minimi

Question 12

Abductor digiti minimi origin

Answer 12

Flexor retinaculum

Question 13

Abductor digiti minimi insertion

Answer 13

Base of the proximal phalanx of digit 5

Question 14

Abductor digiti minimi primary action

Answer 14

Abducts digit 5

Question 15

What are the thenar muscles innervated by?

Answer 15

Recurrent branches of the median nerve

Question 16

What are the hypothenar muscles innervated by?

Answer 16

Deep branch of the ulnar nerve

Question 17

Flexor digiti minimi origin

Answer 17

Flexor retinaculum

Question 18

Flexor digiti minimi insertion

Answer 18

Base of the proximal phalanx of digit 5

Question 19

Flexor digiti minimi primary action

Answer 19

Flexes the MP joint of digit 5

Question 20

Opponens digiti minimi origin

Answer 20

Flexor retinaculum

Question 21

Opponens digiti minimi insertion

Answer 21

Shaft of metacarpal 5

Question 22

Opponens digiti minimi primary action

Answer 22

Opposes digit 5

Question 23

What are the intrinsic muscles of the central compartment?

Answer 23

Adductor pollicis longus, Palmar interosseous muscles (3), Dorsal interossesous muscles (4), Lumbricals (4)

Question 24

What are the intrinsic muscles of the central compartment innervated by?

Answer 24

Mostly by deep branch of ulnar nerve

Question 25

Adductor pollicis origin

Answer 25

Transverse head from Metacarpal 3

Oblique head from capitate and bases of Metacarpals 2-3

Question 26

Adductor pollicis insertion

Answer 26

Medial base of the proximal phalanx of the thumb

Question 27

Adductor pollicis actions

Answer 27

Adducts and flexes the thumb

Question 28

Palmar interosseous muscles origin

Answer 28

Shafts of Metacarpals 2, 4, 5

Question 29

Palmar interosseous muscles insertion

Answer 29

Extensor expansions of digits 2, 4, 5

Question 30

Palmar interosseous muscles actions

Answer 30

Adduction; flexion of MP joints extension of PIP and DIP joints

Question 31

Dorsal interosseous muscles origin

Answer 31

Bipennate muscles originating from adjacent metacarpal shafts

Question 32

Dorsal interosseous muscles insertion

Answer 32

Base of proximal phalanx and extensor expansion of digits 2-4

Question 33

Dorsal interosseous muscles actions

Answer 33

Abduction; flexion of MP joints extensions of PIP and DIP joints

Question 34

Lumbricals origin

Answer 34

Tendons of flexor digitorum profundus

Question 35

Lumbricals insertion

Answer 35

Lateral side of the extensor expansions of digits 2-5

Question 36

Lumbricals innervation

Answer 36

1-2 by median nerve, 3-4 by deep branch of ulnar nerve

Question 37

Lumbricals actions

Answer 37

Flexion of MP joints; extension of PIP and DIP joints. Abduction of digits 2-3; adductions of digits 4-5