Deep intrinsic muscles of the sole

Question 1

Quadratus plantae insertion

Answer 1

flexor digitorum longus tendon (lateral border)

Question 2

Quadratus plantae innveration

Answer 2

Lateral Plantar n. S1-S3

Question 3

Quadratus plantae action

Answer 3

Redirects and augments pull of flexor digitorum longus

Question 4

Lumbricals origin

Answer 4

flexor digitorum longus tendons (medial borders)

Question 5

Lumbricals insertion

Answer 5

2nd to 5th toes at dorsal aponeuroses

Question 6

Lumbricals innervation

Answer 6

1st lumbrical: medial plantar n. S2, S3

2nd to 4th lumbricals: lateral plantar n. S2, S3

Question 7

Lumbricals action

Answer 7

Flexes MTP joints of 2nd to 5th toes
Extension of IP joints 2nd to 5th toes
Adducts 2nd to 5th toes toward the big toe

Question 8

Flexor hallucis brevis origin

Answer 8

Cuboid, lateral cuneiforms, and plantar calcaneocuboid ligament

Question 9

Flexor hallucis brevis insertion

Answer 9

Base of proximal phalanx via medial and lateral sesamoids of 1st toe

Question 10

Flexor hallucis brevis innervation

Answer 10

Medial head: medial plantar n. (S1, S2)

Lateral head: lateral plantar n. (S1, S2)

Question 11

Flexor hallucis brevis action

Answer 11

flexes the first MTP joint

supports the longitudinal arch

Question 12

Adductor hallucis origin (oblique and transverse head)

Answer 12

Oblique head: bases of 2nd to 4th metatarsals

Transverse head: MTPs of 3rd to 5th toes, deep transverse metatarsal ligament

Question 13

Adductor hallucis insertion

Answer 13

1st proximal phalanx (base by a common tendon via the lateral sesamoid)

Question 14

Adductor hallucis innervation

Answer 14

lateral plantar n. deep branch (S2, S3)

Question 15

Adductor hallucis brevis action

Answer 15

Flexes the first MTP joint
Adducts big toe
Transverse head: supports transverse arch
Oblique head: supports longitudinal arch

Question 16

Flexor digiti minimi brevis origin

Answer 16

base of 5th metatarsal, long plantar ligament

Question 17

Flexor digiti minimi brevis insertion

Answer 17

base of proximal phalanx of 5th toe

Question 18

Flexor digiti minimi brevis innervation

Answer 18

Lateral plantar n. superficial branch (S2, S3)

Question 19

Flexor digiti minimi brevis action

Answer 19

Flexes MTP joint of 5th toe (little toe)

Question 20

Plantar interossei origin

Answer 20

3rd to 5th metatarsals (medial borders)

Question 21

Plantar interossei insertion

Answer 21

medial base of proximal phalanx of 3rd to 5th toes

Question 22

Plantar interossei action

Answer 22

Adducts 3rd to 5th toes toward 2nd toe
Flexes MTP joints of 3rd to 5th toes
Extends IP joints of 3rd to 5th toes

Question 23

Dorsal interossei origin

Answer 23

1st to 5th metatarsals (by two heads on opposing sides)

Question 24

Dorsal interossei insertion

Answer 24

1st interosseous: 2nd proximal phalanx (medial base)

2nd to 4th interossei: 2nd to 4th proximal phalanges (lateral base), 2nd to 4th toes at dorsal aponeuroses

Question 25

Plantar and Dorsal interossei innervation

Answer 25

Lateral plantar n. (S2, S3)

Question 26

Dorsal interossei action

Answer 26

Abducts 3rd and 4th toes from 2nd toe
Flexes MTP joints of 2nd to 4th toes
Extends IP joints of 2nd to 4th toes

Question 27

Quadratus plantae origin

Answer 27

calcaneal tuberosity (medial and plantar borders on plantar side)