Lecture 13: Deep Posterior Leg and Sole of Foot

Question 1

sustentaculum tali

Answer 1

medial shelf supporting talus; inferior groove for flexor hallucis longus tendon

Question 2

flexor retinaculum prevents _______________ of deep flexors

Answer 2

bowstringing

Question 3

tibialis posterior innervation

Answer 3

tibial n.

Question 4

tibialis posterior actions

Answer 4

inversion and plantar flexion

Question 5

flexor digitorum longus innervation

Answer 5

tibial n.

Question 6

flexor digitorum longus actions

Answer 6

flexes toes; plantar flexion

Question 7

flexor hallucis longus innervation

Answer 7

tibial n.

Question 8

flexor hallucis longus actions

Answer 8

flexion of great toe; important in “pushing off”

Question 9

abductor hallucis innervation

Answer 9

medial plantar n.

Question 10

abductor hallucis actions

Answer 10

abduction and assistance in flexion of great toe; maintenance of medial longitudinal arch

Question 11

flexor digitorum brevis innervation

Answer 11

medial plantar n.

Question 12

flexor digitorum brevis actions

Answer 12

flexion of digits 2-4 (or 5); maintenance of longitudinal arches

Question 13

abductor digiti minimi innervation

Answer 13

lateral plantar n.

Question 14

abductor digiti minimi actions

Answer 14

abduction and flexion of 5th toe; maintenance of longitudinal arch

Question 15

quadratus plantae innervation

Answer 15

lateral plantar n.

Question 16

quadratus plantae actions

Answer 16

adjustment of pull by flexor digitorum longus tendons to conform more closely to axes of toes

Question 17

lumbrical mm. innervations

Answer 17

1- medial plantar n.

#2-4 - lateral plantar n.

Question 18

lumbrical mm. actions

Answer 18

extension of PIP and DIP joints and flexion of MTP joints of digits 2-5

Question 19

flexor hallicus brevis innervation

Answer 19

medial plantar n.

Question 20

flexor hallicus brevis actions

Answer 20

flexion of great toe

Question 21

adductor hallicus innervation

Answer 21

lateral plantar n.

Question 22

adductor hallicus actions

Answer 22

adduction and assistance of great toe; maintenance of transvers plantar arch

Question 23

flexor digiti minimi brevis innervation

Answer 23

lateral plantar n.

Question 24

flexor digiti minimi brevis actions

Answer 24

flexion of digit 5

Question 25

plantar interosseous muscles innervation

Answer 25

lateral plantar n.

Question 26

plantar interosseous muscles actions

Answer 26

adducts digits III-V

Question 27

dorsal interosseous muscles innervation

Answer 27

lateral plantar n.

Question 28

dorsal interosseous muscles actions

Answer 28

abducts digits II-V

Question 29

lateral plantar a.

Answer 29

larger than medial plantar a.; supplies most of sole and lateral 4 toes

Question 30

medial plantar a.

Answer 30

smaller than lateral plantar a.

Question 31

medial plantar n.

Answer 31

supplies abductor hallicus, flexor hallucis brevis, flexor digitorum brevis, and lumbrical 1 mm.

Question 32

lateral plantar n.

Answer 32

supplies abductor digiti minimi, flexor digiti minimi, quadratus plantae, lumbricals 2-4, adductor hallucis and interossei

Question 33

branches of tibial n.

Answer 33

1. medial plantar n.
2. lateral plantar n.

Question 34

L4 dermatome innervates __________

Answer 34

digit 1

Question 35

L5 dermatome innervates ___________

Answer 35

digit 2-4

Question 36

S1 dermatome innervates ____________

Answer 36

digit 5

Question 37

medial longitudinal arch

Answer 37

consists of calcaneus, talus, navicular, three cuneiforms and medial three metatarsals; supported by spring ligament

Question 38

lateral longitudinal arch

Answer 38

consists of calcaneus, cuboid, metatarsals 4 and 5; supported by long and short plantar ligaments