muscle actions, lower extremity Flashcards
Semimembranosus
sciatic (tibial) L5, S1, S2: MR FK, hex, MRH, PPT
Tibialis anterior
Deep fibular (peroneal) L4, L5: Dorsiflexion ankle, inversion, dynamic support of the medial arch
EHL
deep fibular (peroneal) L5, S1; extension of greattoe, dorsiflexion foot, inversion
EDL
deep fibular L5, s1: extension of lateral four toes, dorsiflexion foot
EDB
deep peroneal L4, L5, s1 extend mtp and ip joints of great toe, extend 2 to 4 toe,
gastrocnemius
tibial nerve (s1, s2): plantarlexion at ankle and flexion at knee
soleus
tibial nerve (s1, S2): plantarflexion at ankle
plantaris
tibial nerve, (s1, s2): plantarflex at ankle and flexion at knee-weak
popliteus
tibial nerve (l4, l5, S1), stablized knee joint by resisting lateral rotation of tibia on femur unlocks knee joint, weak knee flexion
FHL
tibial nerve (s2, s3) flexion of great toe at mtp and ip joints, weak plantar flexion of ankle invert foot
FDL
tibial nerve (s2, S3,) flexion of lateral four toes at mtp and ip, weak plantar flexion of the ankle, invert foot
tibialis posterior
tibial nerve (L4, L5), inversion and plantar flexion at TCJ, support medial arch of foot in walking
peroneus longus
suprficial fibular nerve (L5, S1, S2), eversion, weak plantarflexion, support arches
peroneus brevis
superficial fibular nerve (l5, S1,S2) eversion of the foot and weak plantar flexion
peroneus tertius
deep fibular nerve (L5, S1) dorsiflexion an deversion
abductor hallicus 1st layer
medial plantar nerve from the tibial nerve, S2, S3,
abduct the first toe mtp and assist to flex the first toe
flexor digitorum brevis (1st layer)
medial plantar nerve from the tibial nerve (s2, s3); flexion of lateral four toes at pip
abd digiti minimi
lateral plantar nerve from the tibial nerve S2 S3; ab and flexion of the 5th toe at the mtp
quadratus plantae
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
lumbricals (2nd layer)
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
fhb (3nd layer)
medial plantar nerve from tibial nerve (s2, s3) flexion of the mtp
add hallucus (3rd layer)
lateral plantar nerver from tibial nerve (s2, S3), adduction of the great toe at mtp, maintain transverse arch, weak flexion
flexior digiti minimi brevis (3rd layer)
lateral plantar nerve from tibial nerve (s2, s3) flexion of the little toe at the mtp
dorsal interossei (4th layer)
lateral plantar nerve from tibial nerve (s2, S3) resist extension of mtp , flexion of ip; abd of mtp flexion of mtp extionsion of ip
plantar interossei (4th layer)
lateral plantar never from tibial nerve (s2, S3) adduction of 3-5th toe at mtp, flexion of the mtp and extion of the ip
psoas major
anterior rami L1, L2, L3, flex, lateral rotate hip, Atp flex trunk to thigh
illiacus
femoral n, L2, L3, flex laterally rotate hip, flex trunk to thigh ATP
sartorius
femoraln, L2, L3, flex thigh at hip, flex leg at knee, assit er and ab of hip, medially rotate flexed knee
quadriceps femoris (all)
femoral n L2 L3 L4, extension of knee, rec fem, hip flexion
Pectinius
femoral L2, L3 and obturator nerve l2, l3, l4, adduct hip, medial rotate hip, flex hip
adductor longus
obturator n, L2, l3, l4, adduct and medially rotate the hip
adductor brevis
obturator n, l2, l3, l4, adduct thigh at hip, medial rotati of hip, flex hip assist
adductor magnus
HM: sciatic (tibial, L4) extend hip, AD: obturator L2, L3, L4, adduction medial rotation of thigh at hip assit flexion.
gracillis
obturator L2, L3, adduction of hip and flexion of leg at knee, medial rotation of the flexed knee
glute max
inferior gluteal nerver, L5, S1, S2, hip extension of flexed femur, external rotation, stablization of hip and knee
glute med
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
glute min
superior gluteal nerve l4, l5, s1, abd hip, medial rotate hip, lex hip, stablize pelvis during unilateral stance
TFL
superior gluteal nerve l4, l5, s1, stablize knee in extension, flex the hip, medial rtoate the hip abuct the hip
piriformis
n to piriformis, s1, s2, LEAF
obturator internus
n to obturator internus, L5, S1 LEAF
gemellus superior
n to obturator internus, L5, s1, Leaf
gemellus inferior
n to quadratus femoris Lf, S1, Leaf
quadratus femoris
n to quadratus femoris l5, s1 lateral rotation of femur at hip
obturator exturnus
obturator nerve (posterior) L3, L4 lateral rotation of the thigh at the hip
biceps femoris
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.
Semitendinosus
Sciatic (tibial) L4, S1, S2: medially rotate the flexed knee extend the hip assist to medially rotate the hip, PPT
