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Muscle Origins, Insertions, Actions, & Innervations (Knee, Ankle, and Foot)

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adooley's version from 2017-08-07 03:42

Muscles Innervated by the Femoral Nerve

Question Answer Column 3 Column 4 Column 5
Rectus FemorisAnterior Inferior Iliac SpineTibial tuberosity via Patellar tendonHip flexion, knee extensionFemoral nerve L2, L3, L4
Vastus LateralisLinea asperaTibial tuberosity via patellar tendonKnee extensionFemoral nerve L2, L3, L4
Vastus MedialisLinea asperaTibial tuberosity via patellar tendonKnee extensionFemoral nerve L2, L3, L4
Vastus IntermedialisAnterior femurTibial tuberosity via patellar tendonKnee extensionFemoral nerve L2, L3, L4
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Muscles Innervated by the Sciatic Nerve

Question Answer Column 3 Column 4 Column 5
SemimembranosusIschial tuberosityPosterior surface of medial condyle of tibiaExtend hip and flex kneeSciatic nerve L5, S1, S2
SemitendinosusIschial tuberosityAnteromedial surface of proximal tibiaExtend hip, flex kneeSciatic Nerve L5, S1, S2
Biceps FemorisLong head- Ischial tuberosity, Short head- Lateral lip of linea asperaFibular headLong head- Extend hip/flex knee, Short head- Flex kneeLong head- Sciatic nerve S1, S2, S3, Short head- Common peroneal nerve L5, S1, S2
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Muscles Innervated by the Tibial Nerve

Question Answer Column 3 Column 4 Column 5
PopliteusLateral condyle of femurPosteriorly on medial condyle of tibiaInitiates knee flexionTibial nerve L4, L5, S1
GastrocnemiusMedial and lateral condyles of femur (two heads)Posterior calcaneusKnee flexion, ankle plantar flexionTibial nerve S1,S2
SoleusPosterior tibia and fibulaPosterior calcaneusAnkle plantar flexionTibial nerve S1, S2
PlantarisPosterior lateral condyle of femurPosterior calcaneusAssist in knee flexion; ankle plantar flexion when presentTibial nerve L4, L5, S1
Tibialis PosteriorInterosseous membrane, adjacent tibia and fibulaNavicular and most tarsals and metatarsalsAnkle inversion; assists in plantar flexionTibial nerve L5, S1
Flexor Hallucis LongusPosterior fibula and interosseous membraneDistal Phalanx of the great toeFlexes great toe; assists in inversion and plantar flexion of ankleTibial nerve L5, S1, S2
Flexor Digitorum LongusPosterior tibiaDistal phalanx of four lesser toesFlexes four lesser toes; assists ankle inversion and plantar flexionTibial nerve L5, S1
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Muscles Innervated by the Peroneal nerves

Question Answer Column 3 Column 4 Column 5
Tibialis AnteriorLateral tibia and interosseous membraneFirst cuneiform and metatarsalAnkle inversion and dorsiflexionDeep peroneal nerve L4, L5, S1
Extensor Hallucis LongusFibula and interosseous membraneDistal phalanx of great toeExtends first toe; assists in ankle inversion and dorsiflexionDeep peroneal nerve L4, L5, S1
Extensor Digitorum LongusFibula, interosseous membrane, tibiaDistal phalanx of four lesser toesExtends four lesser toes, assists in ankle dorsiflexionDeep peroneal nerve L4, L5, S1
Peroneus LongusFibula, interosseous membraneFirst cuneiform and metatarsalAnkle eversion; assists in ankle plantar flexionSuperficial peroneal nerve L4, L5, S1
Peroneus BrevisLateral distal FibulaBase of 5th metatarsalAnkle eversion; assists in plantar flexionSuperficial peroneal nerve L4, L5, S1
Peroneus TertiusDistal medial FibulaBase of 5th metatarsalAssists in ankle eversion and dorsal flexionSuperficial peroneal nerve L4, L5, S1
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