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Leg

BIO 201 Muscle Handout

QuestionAnswer
Origin: Dorsal ilium, sacrum, & coccyx Insertion: Posterior surface of femur & fascia of the thigh Action: Extends thigh at hip Gluteus maximus
Origin: Lateral surface of ilium Insertion: Greater trochanter of femur Action: Abducts & rotates thigh medially Gluteus medius
Origin: Anterior iliac crest Insertion: Fascia of thigh Action: Abducts & rotates thigh Tensor fascia latae
Origin: Anterior superior iliac spine Insertion: Medial tibia Action: Used in crossing legs Sartorius
Origin: Medial surface of femur Insertion: Tibial tuberosity Action: Extends the leg at knee Vastus medialis
Origin: Greater trochanter & posterior surface of the femur Insertion: Tibial tuberosity Action: Extends the leg at knee Vastus lateralis
Origin: Spine of ilium & margin of acetabulum Insertion: Tibial tuberosity Action: Extends the leg, flexes thigh Rectus femoris
Origin: Anterior & lateral surfaces of femur Insertion: Tibial tuberosity Action: Extends the leg Vastus intermedius
Origin: Symphysis pubis: Insertion: Medial tibia Action: Adducts thigh Gracilis
Origin: Pubic bone (near symphysis pubis) Insertion: Posterior femur Action: Adducts and rotates thigh Adductor longus
Origin: Ischial tuberosity Insertion: Posterior surface of femur Action: Adducts, extends & rotates thigh laterally Adductor magnus
Origin: Ischial tuberosity Insertion: Medial surface of tibia Action: Flexes & rotates leg medially & extends thigh Semitendinosus
Origin: Ischial tuberosity Insertion: Medial surface of tibia Action: Flexes & rotates leg (medially) Semimembranosus
Origin: Ischial tuberosity and linea aspera Insertion: Head of fibula/ Lateral condyle of tibia Action: Flexes & rotates leg (laterally) Biceps femoris
Origin: Lateral condyle and surface of tibia Insertion: Cuniform and 1st metatarsal Action: Dorsiflexion and inversion of foot Tibialis anterior
Origin: Lateral condyle of tibia/ Fibula Insertion: Distal phalanx of toes Action: Extends the toes Extensor digitorum longus
Origin: Medial & lateral condyles of femur Insertion: Posterior surface of calcaneus Action: Plantar flexion of foot & flexion of leg at knee Gastrocnemius
Origin: Head of fibula, proximal tibia Insertion: Posterior surface of calcaneus Action: Plantar flexion of foot Soleus
Origin: Posterior surface of tibia Insertion: Distal phalanges 2-5 Action: Plantar flexion, inversion of foot, flexes of 4 lateral toes Flexor digitorum longus
Origin: Posterior fibula Insertion: Distal phalanx of big toe Action: Flexes the big toe Flexor hallicus longus
Created by: rolyatstrebor