muscle actions, lower extremity

Question 1

Semimembranosus

Answer 1

sciatic (tibial) L5, S1, S2: MR FK, hex, MRH, PPT

Question 2

Tibialis anterior

Answer 2

Deep fibular (peroneal) L4, L5: Dorsiflexion ankle, inversion, dynamic support of the medial arch

Question 3

EHL

Answer 3

deep fibular (peroneal) L5, S1; extension of greattoe, dorsiflexion foot, inversion

Question 4

EDL

Answer 4

deep fibular L5, s1: extension of lateral four toes, dorsiflexion foot

Question 5

EDB

Answer 5

deep peroneal L4, L5, s1 extend mtp and ip joints of great toe, extend 2 to 4 toe,

Question 6

gastrocnemius

Answer 6

tibial nerve (s1, s2): plantarlexion at ankle and flexion at knee

Question 7

soleus

Answer 7

tibial nerve (s1, S2): plantarflexion at ankle

Question 8

plantaris

Answer 8

tibial nerve, (s1, s2): plantarflex at ankle and flexion at knee-weak

Question 9

popliteus

Answer 9

tibial nerve (l4, l5, S1), stablized knee joint by resisting lateral rotation of tibia on femur unlocks knee joint, weak knee flexion

Question 10

FHL

Answer 10

tibial nerve (s2, s3) flexion of great toe at mtp and ip joints, weak plantar flexion of ankle invert foot

Question 11

FDL

Answer 11

tibial nerve (s2, S3,) flexion of lateral four toes at mtp and ip, weak plantar flexion of the ankle, invert foot

Question 12

tibialis posterior

Answer 12

tibial nerve (L4, L5), inversion and plantar flexion at TCJ, support medial arch of foot in walking

Question 13

peroneus longus

Answer 13

suprficial fibular nerve (L5, S1, S2), eversion, weak plantarflexion, support arches

Question 14

peroneus brevis

Answer 14

superficial fibular nerve (l5, S1,S2) eversion of the foot and weak plantar flexion

Question 15

peroneus tertius

Answer 15

deep fibular nerve (L5, S1) dorsiflexion an deversion

Question 16

abductor hallicus 1st layer

Answer 16

medial plantar nerve from the tibial nerve, S2, S3,

abduct the first toe mtp and assist to flex the first toe

Question 17

flexor digitorum brevis (1st layer)

Answer 17

medial plantar nerve from the tibial nerve (s2, s3); flexion of lateral four toes at pip

Question 18

abd digiti minimi

Answer 18

lateral plantar nerve from the tibial nerve S2 S3; ab and flexion of the 5th toe at the mtp

Question 19

quadratus plantae

Answer 19

lateral plantar nerve from tibial nerve (s2, s3) assist flexor gigitorum longus in flexing 2nd to 5th toes, changing the angle of force application to be more linear

Question 20

lumbricals (2nd layer)

Answer 20

1st lumbrical medial plantar nerve from the tibial nerve, 2-4th = lateral plantar nerve (s2, s3); flexion of the metatarsophalangeal joint and extension of the ip, toes 2-5

Question 21

fhb (3nd layer)

Answer 21

medial plantar nerve from tibial nerve (s2, s3) flexion of the mtp

Question 22

add hallucus (3rd layer)

Answer 22

lateral plantar nerver from tibial nerve (s2, S3), adduction of the great toe at mtp, maintain transverse arch, weak flexion

Question 23

flexior digiti minimi brevis (3rd layer)

Answer 23

lateral plantar nerve from tibial nerve (s2, s3) flexion of the little toe at the mtp

Question 24

dorsal interossei (4th layer)

Answer 24

lateral plantar nerve from tibial nerve (s2, S3) resist extension of mtp , flexion of ip; abd of mtp flexion of mtp extionsion of ip

Question 25

plantar interossei (4th layer)

Answer 25

lateral plantar never from tibial nerve (s2, S3) adduction of 3-5th toe at mtp, flexion of the mtp and extion of the ip

Question 26

psoas major

Answer 26

anterior rami L1, L2, L3, flex, lateral rotate hip, Atp flex trunk to thigh

Question 27

illiacus

Answer 27

femoral n, L2, L3, flex laterally rotate hip, flex trunk to thigh ATP

Question 28

sartorius

Answer 28

femoraln, L2, L3, flex thigh at hip, flex leg at knee, assit er and ab of hip, medially rotate flexed knee

Question 29

quadriceps femoris (all)

Answer 29

femoral n L2 L3 L4, extension of knee, rec fem, hip flexion

Question 30

Pectinius

Answer 30

femoral L2, L3 and obturator nerve l2, l3, l4, adduct hip, medial rotate hip, flex hip

Question 31

adductor longus

Answer 31

obturator n, L2, l3, l4, adduct and medially rotate the hip

Question 32

adductor brevis

Answer 32

obturator n, l2, l3, l4, adduct thigh at hip, medial rotati of hip, flex hip assist

Question 33

adductor magnus

Answer 33

HM: sciatic (tibial, L4) extend hip, AD: obturator L2, L3, L4, adduction medial rotation of thigh at hip assit flexion.

Question 34

gracillis

Answer 34

obturator L2, L3, adduction of hip and flexion of leg at knee, medial rotation of the flexed knee

Question 35

glute max

Answer 35

inferior gluteal nerver, L5, S1, S2, hip extension of flexed femur, external rotation, stablization of hip and knee

Question 36

glute med

Answer 36

superior gluteal nerve L4, L5, S1, open chain: ab of femur at hip, closed: holds pelvis secure over stance, prevents plevic drop on the opposite swing side during walking, ant: internal rotation and nip flex, post: ext and extend hip

Question 37

glute min

Answer 37

superior gluteal nerve l4, l5, s1, abd hip, medial rotate hip, lex hip, stablize pelvis during unilateral stance

Question 38

TFL

Answer 38

superior gluteal nerve l4, l5, s1, stablize knee in extension, flex the hip, medial rtoate the hip abuct the hip

Question 39

piriformis

Answer 39

n to piriformis, s1, s2, LEAF

Question 40

obturator internus

Answer 40

n to obturator internus, L5, S1 LEAF

Question 41

gemellus superior

Answer 41

n to obturator internus, L5, s1, Leaf

Question 42

gemellus inferior

Answer 42

n to quadratus femoris Lf, S1, Leaf

Question 43

quadratus femoris

Answer 43

n to quadratus femoris l5, s1 lateral rotation of femur at hip

Question 44

obturator exturnus

Answer 44

obturator nerve (posterior) L3, L4 lateral rotation of the thigh at the hip

Question 45

biceps femoris

Answer 45

LH: sciatic (tibial) L5, S1, S2, SH: sciatic (peroneal) L5, S1, S2 knee flexion and lateral rotation of the knee, long head, extension of the hip, lateral rotation of the thigh at hip.

Question 46

Semitendinosus

Answer 46

Sciatic (tibial) L4, S1, S2: medially rotate the flexed knee extend the hip assist to medially rotate the hip, PPT