Muscles (Origin, Insertion, Action, Innervation)

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Abductor digiti minimi

Action: Abducts fifth digit Innervation: Lateral plantar nerve

Abductor hallucis

Action: Abducts hallux Innervation: Medial plantar

Fibularis tertius

Action: Dorsiflexes and everts foot Innervation: Deep fibular nerve

Tibialis anterior

Action: Dorsiflexes and inverts foot Innervation: Deep fibular nerve

Extensor digitorum longus

Action: Extends digis 2-5; dorsiflexes foot Innervation: Deep fibular

Extensor digitorum brevis

Action: Extends digits 1-4 Innervation: Deep fibular nerve

Extensor hallucis longus

Action: Extends hallux; dorsiflexes foot Innervation Deep fibular nerve

Flexor digitorum brevis

Action: Flexes digits 2-5 Innervation: Medial plantar nerve

Flexor digitorum longus

Action: Flexes digits 2-5; plantar flexes and inverts foot Innervation: Tibial nerve

Flexor hallucis longus

Action: Flexes hallux; plantar flexes foot Innervation: Tibial nerve

Gastrocnemius

Action: Flexes leg; plantar flexes foot Innervation: Tibial nerve

Plantaris

Action: Flexes leg; plantar flexes foot Innervation: Tibial nerve

Popliteus

Action: Flexes leg; rotates tibia medially Innervation: Tibial nerve

Gemellus inferior

Action: Lateral rotation of hip (thigh); some abduction

Gernellus superior

Action: Lateral rotation of hip or thigh; some abduction

Obturator Internus

Action: Lateral rotation of hip or thigh; some abduction

Quadratus femoris

Action: Lateral rotation of thigh

Fibularis longus

Action: Plantar flexes and everts foot Innervation: Superficial fibular

Fibularis brevis

Action: Plantar flexes and everts foot Innervation: Superficial fibular nerve

Tibialis posterior

Action: Plantar flexes and inverts foot Innervation: Tibial nerve

Soleus

Action: Plantar flexes foot Innervation: Tibial nerve

Psoas major

Origin: All lumbar vertebrae Insertion: Lesser trochanter of femur Action: Flexes thigh; flexes trunk (or flexes hip) Innervation: Lumbar nerves

Rectus femoris

Origin: Anterior inferior iliac spine; superior margin of acetabulum Insertion: Tibial tuberosity Action: Extension of leg Innervation: Femoral nerve

Tensor fasciae latae

Origin: Anterior portion of crest of ilium Insertion: Iliotibial tract of fascia lata Action: Flex, abduct and medially rotate hip (thigh) Innervation: Superior gluteal nerve

Piriformis

Origin: Anterior sacrum Insertion: Greater trochanter of femur Action: Lateral rotation of hip (thigh) Innervation: N. to piriformis

Vastus intermedius

Origin: Anterior shaft of upper femur Insertion: Tibial tuberosity Action: Extension of leg of knee Innervation: Femoral nerve

Sartorius

Origin: Anterior superior iliac spine Insertion: Upper part of medial surface of tibia Action: Flexes leg and thigh Innervation: Femoral nerve

Iliacus

Origin: Iliac fossa Insertion: Lesser trochanter of femur Action: Flexes hip Innervation: Femoral nerve

Adductor brevis

Origin: Inferior pubic ramus Insertion: Upper part of posterior femur Action: Adduct hip Innervation: Obturator nerve

Biceps femoris long head

Origin: Ischial tuberosity Insertion: Head of fibula Action: Flexes leg; extends thigh Innervation: Tibial nerve

Semimembranosus

Origin: Ischial tuberosity Insertion: Posterior upper tibia Action: Flexes leg and extends thigh Innervation: tibial nerve

Semitendinosus

Origin: Ischial tuberosity Insertion: upper part of medial tibia Action: Flexes leg; extends thigh Innervation: tibial nerve

Vastus lateralis

Origin: Lateral lip of linea aspera Insertion: Tibial tuberosity Action: Extension of leg or knee Innervation: Femoral nerve

Vastus medialis

Origin: Medial lip of linea aspera Insertion: Tibial tuberosity Action: Extension of leg or knee Innervation: Femoral nerve

Gluteus medius

Origin: Outer surface and crest of ilium Insertion: Greater trochanter of femur Action:Abducts hip (thigh) Innervation: Superior gluteal nerve

Gluteus minimus

Origin: Outer surface of ilium Insertion: Greater trochanter of femur Action: Abducts thigh Innervation: Superior gluteal nerve

Adductor longus

Origin: Pubic bone Insertion: Linea aspera Action: Adducts, flexes hip (thigh); Some lateral rotation Innervation: Obturator nerve

Gracilis

Origin: Pubic bone Insertion: Upper part of medial surface of tibia Action: Flexes knee; adduction of hip (thigh) Innervation: Obturator nerve

Pectineus

Origin: Pubis Insertion: Upper part of posterior femur Action: Adducts, flexes hip (thigh) Innervation: Femoral nerve

Adductor magnus

Origin: Rami or pubis and ischcium Insertion: Linea aspera; adductor tubercle Action: Adducts hip Innervation: Obturator nerve

Gluteus maximus

Origin: posterior portion of ilium; post. lower part of sacrum and coccyx Insertion: Gluteal tuberosity and iliotibial tract of fascia lata Action: Extension and lateral rotation of hip (thigh) Innervation: Inferior gluteal nerve

Biceps Femoris short head

Origin: shaft of femur Insertion: with the long head - they share a common tendon Action: Flexes leg Innervation: Common fibular nerve


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