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Unit 2A-1

Muscles of Lower Extremity

Muscle Origin Insertion Action Innervation Group
Piriformis Anterior Sacrum Greater Trochanter Lateral Rotation Nerve to Piriformis Lateral Rotators
Superior gemellus Spine of ischium OI tendon Lateral Rotation Sacral Plexus n. Lateral Rotators
Obturator Internus (OI) Internal surface of obturator membrane Greater Trochanter Lateral Rotation Sacral Plexus n. Lateral Rotators
Inferior gemellus Ischial Tuberosity OI tendon Lateral Rotation Sacral Plexus n. Lateral Rotators
Quadratus Femoris Ischial Tuberosity Intertrochanteric crest Lateral Rotation Sacral Plexus n. Lateral Rotators
Obturator Externus Lateral Rotation Lateral Rotators
iliopsoas iliac fossa, lumbar vertebrae Lesser trochanter Flexion of trunk Femoral n. Anterior Thigh Muscles
Sartorius ASIS upper medial tibia (per anserinus ) Flex, Abduct, laterally rotate thigh, flex leg Femoral n. Anterior Thigh Muscles
(QF)Rectus Femoris AIIS, acetabulum Tibial Tuberosity Flex thigh, Extend Leg Femoral n. Anterior Thigh Muscles
(QF) Vastus Lateralis Greater Trochanter, Linea aspera Tibial Tuberosity Extend Leg Femoral n. Anterior Thigh Muscles
(QF) Vastus Medialis Linea Aspera Tibial Tuberosity Extend Leg Femoral n. Anterior Thigh Muscles
(QF) Vastus Intermedius Upper Femur Tibial Tuberosity Extend Leg Femoral n. Anterior Thigh Muscles
Gracilis Pubis upper medial tibia (per anserinus ) Adduct & Flex Thigh Obturator n. Medial Thigh Muscles
Pectineus Pubis Upper Femur Adduct & Flex Thigh Femoral n. Medial Thigh Muscles
Adductor Longus Pubis Linea Aspera Adduct & Flex Thigh Obturator n. Medial Thigh Muscles
Adductor Brevis Pubis Linea Aspera Adduct & Flex Thigh Obturator n. Medial Thigh Muscles
Adductor Magnus (Adductor Part) Ischiopubic ramus Linea Aspera Adduct & Flex Thigh Obturator n. Medial Thigh Muscles
Adductor Magnus (Extensor Part) Ischial Tuberosity Adductor tubercle Extend Thigh Sciatic n. Medial Thigh Muscles
Semitendinosus Ischial Tuberosity upper medial tibia (per anserinus ) Extend Thigh, Flex Leg Sciatic n. Posterior Thigh Muscles
Semimembranosus Ischial Tuberosity Medial Condyle of Tibia Extend Thigh, Flex Leg Sciatic n. Posterior Thigh Muscles
Biceps Femoris (Long Head) Ischial Tuberosity Head of Fibula Extend Thigh, Flex Leg Sciatic n. Posterior Thigh Muscles
Biceps Femoris (Short Head) Linea Aspera Head of Fibula Laterally rotate Leg at knee Sciatic n. Posterior Thigh Muscles
Tibialis Anterior Upper lateral tibia Medial cuneiform, 1st metatarsal Dorsiflex and invert foot Deep fibular/peroneal n. Anterior Leg Compartment
Extensor hallucis longus m. Middle Fibula Distal Phalanx of toe 1 Extend big toe Deep fibular/peroneal n. Anterior Leg Compartment
Extensor Digitorum longus m. Lateral condyle of tibia, Upper fibula Toes 2-5 Extend Toes 2-5 Deep fibular/peroneal n. Anterior Leg Compartment
Fibularis (peroneus) Tertius Lower fibula 5th metatarsal Dorsiflex & evert foot Deep fibular/peroneal n. Anterior Leg Compartment
Fibularis (peroneus) Longus Upper Fibula Medial cuneiform, 1st metatarsal Evert foot Superficial Fibular/peroneal n. Lateral Leg Compartment
Fibularis (peroneus) brevis Lower fibula 5th Metatarsal Evert foot Superficial Fibular/peroneal n. Lateral Leg Compartment
Gastrocnemius Lateral & Medial condyles of femur Calcaneus Plantar Flex Foot Tibial n. Superficial Posterior Leg Compartment
Soleus Upper tibia and Fibula Calcaneus Plantar Flex Foot Tibial n. Superficial Posterior Leg Compartment
Plantaris (freshman nerve) Above Lateral condyle of Femur Calcaneus Plantar Flex Foot Tibial n. Superficial Posterior Leg Compartment
Tibialis Posterior Upper tibia and Fibula Tarsals, Metatarsals 2-4 Invert foot Tibial n. Deep Posterior Leg Compartment
Flexor Digitorum Longus Middle Tibia Distal Phalanx toes 2-5 Flex toes 2-5 Tibial n. Deep Posterior Leg Compartment
Flexor Hallucis Longus Middle Fibula Distal Phalanx toe 1 Flex toe 1 Tibial n. Deep Posterior Leg Compartment
Gluteus Maximus Ilium, Sacrum, Coccyx Gluteal tuberosity Extend & Laterally rotate thigh at Hip Inferior gluteal n. Gluteal Region
Gluteus medius ilium Greater Trochanter Abduct & medially rotate thigh Superior gluteal n. Gluteal Region
Gluteus Minimus ilium Greater Trochanter Abduct & medially rotate thigh Superior gluteal n. Gluteal Region
Tensor Fascia Latae iliac crest, ASIS IT band Flex & medially rotate thigh Superior gluteal n. Gluteal Region
Created by: osabdelr