Intrinsic Foot Muscles Flashcards Preview

T1 & T2 Anatomy > Intrinsic Foot Muscles > Flashcards

Flashcards in Intrinsic Foot Muscles Deck (20):
1

What's the (only) intrinsic foot muscle in the dorsum of the foot?

extensor digitorum brevis (we're considering ext. hallucis brevis to be part of ext. dig. brev.)

2

What are the attachment pionts of extensor digitorum brevis?

S/P: anterior dorsal surface of the calcaneus
I/D: medial distal 4 phalanges (we're considering ext. hallucis brevis to be part of ext. dig. brev.)

3

What's the action of extensor digitorum brevis?

Extension of the medial 4 toes

4

How are abduction and adduction referenced when considering the foot?

Everything moving away/toward the 2nd toe (abd away; add toward)

5

How many muscular layers are there in the sole of the foot?

4

6

What are the muscles of the first layer in the sole of the foot?

-abductor hallucis
-flexor digitorum brevis
-abductor digiti minimi

7

What's the action of abductor hallucis?

abduction of the 1st toe

8

What's the action of flexor digitorum brevis?

flexion of 2nd-5th toes

9

What's the action of abductor digiti minimi

abduction of the 5th toe

10

What are the muscles of the 2nd layer of the sole of the foot?

-quadratus plantae
-lumbricals

11

What's the action of quadratus plantae

assists flexor digitorum longus in flexion of the lateral 4 digits

12

What are the tendons of the 2nd layer of the sole of the foot?

tendons of flexor hallucis longus and and flexor digitorum longus

13

What are the muscles of the 3rd layer of the sole of the foot?

-flexor hallucis brevis
-adductor hallucis
-flexor digiti minimi brevis

14

What's the action of flexor hallucis brevis?

flexion of the 1st MTP joint

15

What's the action of adductor hallucis and what does it help maintain?

-adducts 1st toe
-helps maintain transverse arch

16

What's the action of flexor digiti minimi brevis?

flexion of the 5th MTP joint

17

What are the muscles of the fourth layer of the sole of the foot?

-dorsal interossei
-plantar interossei

18

What's the action of dorsal interossei?

abduction of the 2nd-4th MTP joints (dorsal abduction)

19

What's the action of plantar interossei

adduction of the 3rd-5th MTP joints (plantar adduction)

20

There are two sesamoid bones near the 1st phalanx of the foot. What muscle's tendons adhere to these bones and what is the benefit served by the bones in these tendons?

-flexor hallucis brevis
-bones protect the tendons from pressure during standing and walking