Exam 4 Muscles of the Deep Posterior Leg Flashcards Preview

Gross 1 > Exam 4 Muscles of the Deep Posterior Leg > Flashcards

Flashcards in Exam 4 Muscles of the Deep Posterior Leg Deck (17):
1

Which muscles make up the deep posterior leg:

1. Popliteus
2. Flexor digitorum longus
3. Flexor hallicuis longus
4. Tibialis posterior

2

- Small muscle, which is deep to the heads of the gastrocnemius where it is obliquely placed
- Helps form the floor of the popliteal fossa

Popliteus

3

Origin of the popliteus:

Lateral epicondyle of the femur

4

Insertion of the popliteus:

Shaft of the tibia

5

Actions of the poplieus:

1. medial rotation of the tibia (which unlocks the knee joint to allow flexion @ the leg)
2. Stabilizes the knee joint by preventing hyperextension

6

- Most medial of the deep posterior leg muscles & is deep to the soleus
- Tendon passes behind the medial malleolus, b/t the tendons of the flexor hallucis longus & tibialis posterior

Flexor digitorum longus

7

Origin of the flexor digitorum longus:

Shaft of the tibia

8

Insertion of the flexor digitorum longus:

Distal phalanges of digits 2-5

9

Action of the flexor digitorum longus:

1. Flexes digits 2-5
2. plantar flex the foot
3. Supports the medial & lateral longitudinal arch

10

Most lateral of the deep posterior leg muscles:

Flexor hallucis longus

11

Origin of flexor hallucis longus:

Shaft of the fibula; Interosseous membrane

12

Insertion of the flexor hallucis longus:

Distal phalanx of digit one

13

Actions of the flexor hallucis longus:

1. flex digit one
2. plantar flex foot
3. Inversion of the foot
4. supports the medial longitudinal arch

14

- Muscle found b/t the flexor digitorum longus & flexor hallucis longus
- Tendon passes behind the medial malleolus

Tibialis Posterior

15

Origin of tibialis posterior:

Shaft of the fibula & tibia; interosseous membrane

16

Insertion of the tibialis posterior:

Navicular; Cuneiforms; cuboid; 2-4th metatarsals

17

Actions of the tibialis posterior:

1. Inversion of the foot
2. Plantar flex the foot
3. Supports the medial longitudinal arch of the foot