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Muscles
Leg Muscles
26
Biology
Undergraduate 2
04/21/2018

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Term
Adductor brevis
Definition
Adducts, flexes, medially rotates thigh
Term
Adductor longus
Definition
Adducts, flexes, medially rotates thigh
Term
Adductor Magnus
Definition
Adducts, flexes, medially rotates thigh; posterior portion extends thigh
Term
Biceps femoris
Definition
Extends thigh; flexes knee
Origin: 1) ischial tuberosity 2) linea aspera & distal femur
Insertion: Head of fibula & lateral condyle of tibia
Term
Calcaneal tendon
Definition
Term
Extensor digitorum longus
Definition
Prime mover: toe extension
Term
Extensor hallucis longus
Definition
Extends hallux
Term
Fascia lata (Iliotibial tract)
Definition
Steadies the hip and knee laterally
Term
Fibularis longus
Definition
Plantar flexes and everts foot
Term
Gastrocnemius
Definition
Plantar flexes foot; flex knee
Origin: Medial & lateral epicondyles of femur
Insertion: Posterior calcaneus (by calcaneal tendon)
Term
Gluteus maximus
Definition
Prime mover for extension of thigh: laterally rotates and abducts thigh
Origin: Posterior ilium, sacrum, coccyx
Insertion: Gluteal tuberosity of femur, IT tract
Term
Gluteus medius
Definition
Abducts thigh: critical in walking
Origin: Posterior surface of ilium
Insertion: Greater trochanter of femur
Term
Gracilis
Definition
Adducts thigh, flexes & medially rotates leg
Origin: Inferior ramus & body of pubis, ischial ramus
Insertion: Medial condyle of tibia
Term
Iliacus
Definition
Prime mover for flexing thigh or trunk, depending on which end is held still
Term
Iliopsoas
Definition
Iliacus + Psoas Major
Term
Psoas major
Definition
Prime mover for flexing thigh or trunk, depending on which end is held still. Flexes vertebral column laterally.
Term
Rectus femoris
Definition
Extends knee, flexes thigh at hip
Origin: Anterior inferior iliac spine
Insertion: Patella and tibial tuberosity
Term
Sartorius
Definition
Flexes, abducts, laterally rotates thigh
Origin: Anterior superior Iliac spine
Insertion: Medial side of proximal tibia
Term
Semimembranosus
Definition
Extends thigh, flexes knee
Origin: Ischial tuberosity
Insertion: Medial condyle of tibia
Term
Semitendinosus
Definition
Extends thigh, flexes knee
Origin: Ischial tuberosity
Insertion: Medial condyle of tibia
Term
Soleus
Definition
Plantar flexes foot
Term
Tensor fascia lata
Definition
Steadies knee and trunk by tensing iliotibial tract
Term
Tibialis anterior
Definition
Prime mover: dorsiflexion of foot
Term
Vastus intermedius
Definition
Extends knee
Term
Vastus lateralis
Definition
Extends knee
Term
Vastus medialis
Definition
Extends knee
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