Muscles of the posterior leg Flashcards Preview

Human Locomotor Systems > Muscles of the posterior leg > Flashcards

Flashcards in Muscles of the posterior leg Deck (15):
1

What are the muscles of the posterior leg?

- Gastrocnemius
- Soleus
- Plantaris
- Popliteus
- Flexor Hallicus longus
- Flexor digitorum longus
- Tibialis posterior

2

What are the origin and insertion of gastrocnemius?

- Origin: (Lateral head) Lateral aspect of lateral condyle of femur; (medial head) popliteal surface of femur, superior ot medial condyle

- Insertion: Posterior surface of calcaneus, via calcaneal tendon

3

What is the action of gastrocnemius?

- Plantarflexes the foot at the ankle
- Raises heel during walking
- Flexes leg at knee joint

4

What are the origin and insertion of soleus?

- Origin: Posterior aspect of head of fibula, superior quarter of posterior surface of fibula, soleal line, medial border of tibia

- Insertion: Posterior surface of calcaneus via calcaneal tendon

5

What is the action of soleus?

- Plantarflexes foot at ankle
- Steadies leg on foot

6

What are the origin and insertion of plantaris?

- Origin: Inferior end of lateral supracondylar line of femur and oblique popliteal ligament

- Insertion: Posterior surface of calcaneus via calcaneal tendon

7

What is the action of plantaris?

- Weakly assists gastrocnemius in plantarflexing foot at the ankle and flexing the knee

8

What are the origin and insertion of popliteus?

- Origin: Lateral condyle of femur and lateral meniscus

- Insertion: Posterior surface of tibia, superior to soleal line

9

What is the action of popliteus?

Weakly flexes leg at the knee and unlocks it

10

What are the origin and insertion of FHL?

- Origin: Inferior two thirds of posterior surface of fibula and inferior interosseous membrane

- Insertion: Base of distal phalanx of great toe

11

What is the action of FHL?

- Flexes great toe at all joints
- Plantarflexes foot at anke
- Supports longitudinal arches of foot

12

What are the origin and insertion of FDL?

- Origin: Medial part of posterior surface of tibia, inferior to soleal line, and from fascia covering tibialis posterior

- Insertion: Bases of distal phalanges of lateral four digits

13

What is the action of FDL?

- Flexes lateral four digits
- Plantarflexes foot at ankle
- Supports longitudinal arches of foot

14

What are the origin and insertion of Tibialis posterior?

- Origin: Interosseous membrane, posterior surface of tibia inferior ot soleal line, posterior surface of fibula

- Insertion: Tuberosity of navicular, cuneiform and cuboid, and bases of metatarsals 2,3,4.

15

What is the action of tibialis posterior?

- Plantarflexes foot at ankle
- Inverts foot