LL2 - Muscles of the foot

Question 1

how many plantar muscle layers are there?

Answer 1

4

Question 2

what is the plantar aponeurosis?

Answer 2

thickening of fascia on plantar aspect of foot
- protects underlying structures
- supports medial & longitudinal arches

Question 3

muscles of the 1st plantar muscle layer?

Answer 3

abductor digiti minimi
abductor hallucis
flexor digitorum brevis

Question 4

muscles of the 2nd plantar muscle layer?

Answer 4

lumbricals
quadratus plantae

Question 5

muscles of the 3rd plantar muscle layer?

Answer 5

flexor digiti minimi brevis
flexor hallucis brevis
adductor hallucis

Question 6

muscles of the 4th plantar muscle layer?

Answer 6

palmar interossei (3; unipennate)
dorsal interossei (4; bipennate)

Question 7

what are the two muscles of the dorsal foot?

Answer 7

extensor hallucis brevis
extensor digitorum brevis

Question 8

what nerve innervates the dorsal foot muscles?

Answer 8

deep fibular nerve

Question 9

Which intrinsic foot muscles (4) are supplied by the medial plantar nerve? what are the rest supplied by?

Answer 9

1st lumbrical (2nd layer)
abductor hallucis (1st layer)
flexor hallucis brevis (3rd layer)
flexor digitorum brevis (1st layer)

rest supplied by lateral plantar nerve

Question 10

in what plantar muscle layer are the foot lumbricals located?

Answer 10

2nd

Question 11

Which nerve supplies the extensor digitorum brevis and extensor hallucis brevis?

Answer 11

deep fibular nerve

Question 12

the dorsal foot muscles share innervation with what leg compartment?

Answer 12

anterior leg muscle compartment (deep fibular nerve)