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Leg
BIO 201 Muscle Handout
| Question | Answer |
|---|---|
| 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 |