Intrinsic Muscles of the Hand

Question 0

Opponens pollicis insertion?

Answer 0

Lateral side of the 1st metacarpal

Question 1

Opponens pollicis origin? (Thenar muscle)

Answer 1

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 2

Innervation of Opponens pollicis?

Answer 2

Recurrent branch of median nerve (C8, T1)

Question 3

Actions of Opponens pollicis?

Answer 3

to oppose thumb; it draws 1st metacarpal medially to center of palm and rotates it medially.

Question 4

Abductor pollicis brevis origin? (Thenar muscle)

Answer 4

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 5

Abductor pollicis brevis insertion?

Answer 5

Lateral side of base of proximal phalanx of thumb

Question 6

Abductor pollicis longus innervation?

Answer 6

Recurrent branch of median nerve (C8, T1)

Question 7

Abductor pollicis brevis action?

Answer 7

abducts thumb; helps oppose it

Question 8

Flexor pollicis brevis (Superficial & Deep Head) (Thenar muscle) origin?

Answer 8

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 9

Flexor pollicis brevis (Superficial & Deep Head) insertion?

Answer 9

Lateral side of base of proximal phalanx of thumb

Question 10

Flexor pollicis brevis (Superficial & Deep Head) innervation?

Answer 10

Superficial - Recurrent branch of median nerve (C8, T1)

Deep - deep branch of ulnar nerve c8, t1

Question 11

Flexor pollicis brevis (Superficial & Deep Head)

Answer 11

flexes thumb

Question 12

Adductor pollicis (Thenar muscle) origin?

Answer 12

Oblique head : bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
Transverse head : Anterior surface of shaft of 3rd metacarpal

Question 13

Adductor pollicis insertion?

Answer 13

Medial side of base of proximal phalanx of thumb

Question 14

Adductor pollicis innervation?

Answer 14

Deep branch of ulnar nerve (C8, T1)

Question 15

Adductor pollicis action?

Answer 15

adducts thumb toward lateral border of palm

Question 16

Abductor digiti minimi (hypothenar muscle) origin?

Answer 16

Pisiform

Question 17

Abductor digiti minimi insertion?

Answer 17

medial side of base of proximal phalanx of 5th finger

Question 18

Abductor digiti minimi innervation?

Answer 18

Deep branch of ulnar nerve (C8, T1)

Question 19

Abductor digiti minimi action?

Answer 19

abducts 5th finger, assits in flexion of its proximal phalanx

Question 20

Flexor digiti minimi brevis (hypothenar muscle) origin?

Answer 20

Hook of hamate and flexor retinaculum

Question 21

Flexor digiti minimi brevis insertion?

Answer 21

medial side of base of proximal phalanx of 5th finger

Question 22

Flexor digiti minimi brevis innervation?

Answer 22

Deep branch of ulnar nerve (C8, T1)

Question 23

Flexor digiti minimi brevis action?

Answer 23

flexes proximal phalanx of 5th finger

Question 24

Opponens digiti minimi (hypothenar muscle) origin?

Answer 24

Hook of hamate and flexor retinaculum

Question 25

Opponens digiti minimi insertion?

Answer 25

Medial border of 5th metacarpal

Question 26

Opponens digiti minimi Innervation?

Answer 26

Deep branch of ulnar nerve (C8, T1)

Question 27

Opponens digiti minimi action?

Answer 27

Draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb

Question 28

Lumbricals (Short muscles) origin?

Answer 28

1 & 2: Lateral two tendons of flexor digitorum profundus (as unipennate muscles) 3 & 4: medial three tendons of flexor digitorum profundus ( as bipennate muscles)

Question 29

Lumbricals insertion?

Answer 29

Lateral sides of extensor expansions of 2nd-5th fingers

Question 30

Lumbricals innervation?

Answer 30

Median nerve (C8, T1)

Question 31

Lumbricals action?

Answer 31

flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

Question 32

Dorsal interossei, 1-4 (Short muscle) origin?

Answer 32

Adjacent sides of two metacarpals (as bipennate muscles)

Question 33

Dorsal interossei, 1-4 insertion?

Answer 33

Bases of proximal phalanges; extensor expansions of 2nd-4th fingers

Question 34

Dorsal interossei, 1-4 innervation?

Answer 34

Deep branch of ulnar nerve (C8, T1)

Question 35

Dorsal interossei, 1-4 actions?

Answer 35

Abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 36

Palmar interossei, 1-3 (short muscle) origin?

Answer 36

Palmar surfaces of 2nd, 4th and 5th metacarpals (as unipennate muscles)

Question 37

Palmar interossei, 1-3 insertion?

Answer 37

Bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th fingers

Question 38

Palmar interossei, 1-3 innervation?

Answer 38

Deep branch of ulnar nerve (C8, T1)

Question 39

Palmar interossei, 1-3 actions?

Answer 39

Adduct 2nd, 4th and 5th fingers toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints.