Lecture 8: Posterior Leg Flashcards Preview

04. MSK Exam 2 Final > Lecture 8: Posterior Leg > Flashcards

Flashcards in Lecture 8: Posterior Leg Deck (49)
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1

What tendon occupies the groove on the bottom of the sustentaculum tali of the calcaneus?

Tendon of the Flexor Hallucis Longus

2

What two bones does the spring ligament run between?

What arch does the spring ligament support?

(AKA Plantar Calcaneonavicular Ligament)

Calcaneus and Navicular

(Supports Medial Longitudinal Arch)

3

What separates the anterior and lateral compartments of the posterior leg?

The anterior septum

4

What separates the lateral and posterior compartments of the leg?

The posterior septum

5

What separates the anterior and posterior compartments of the leg?

Interosseous Membrane

6

What separates the posterior superficial and posterior deep compartments of the posterior leg?

The transverse septum

 

7

What is the thick fascia that surrounds the leg?

Crural Fascia

8

What muscles are found in the superficial posterior compartment?

  • Gastrocnemius Muscle (2 heads)
  • Soleus Muscle
  • Plantaris Muscle 

The triceps surae are the two heads of the gastrocnemius and soleus muscles. 

9

Gastrocnemius Muscle

What are its attachments?

Origin: Lateral femoral condyle (lateral head) and Popliteal surface superior to medial femoral condyle (medial head)

Insertion: Posterior Surface of Calcaneus

-via Tendon of Calcaneus (Achilles Tendon)

10

Gastrocnemius Muscle

What is its actions?

1. Plantar Flexion

2. Flexes leg at knee joint 

11

Gastrocnemius Muscle

What is its innervation and blood supply?

Innervation: Tibial Nerve

Blood Supply: Posterior Tibial Artery

12

What rare small bone can be found on the lateral head of the gastrocnemius?

What is its clinical signficance? 

 

Fabella: can provide leverage for lateral head 

Painful fabellar stress fracture can accompany total knee replacement 

 

13

Soleus Muscle

What are its attachments?

Origin: Posterior aspect of the Fibula and Soleal Line of Tibia

Insertion: Posterior Surface of Calcaneus

-via Tendon of Calcaneus (Achilles Tendon)

14

Soleus Muscle

What is its actions?

Plantar Flexion

 

15

Soleus Muscle

What is its innervation and blood supply?

Innervation: Tibial Nerve

Blood Supply: Posterior Tibial Artery

16

Plantaris Muscle

What are its attachments?

Origin: Inferior lateral supracondylar line of femur

Insertion: Posterior Surface of Calcaneus

-via Tendon of Calcaneus (Achilles Tendon)

Looks like a nerve but its not!! 

17

Plantaris Muscle

What is its actions?

1. Proprioception for 

2. Weak plantarflexion

3. Weak leg flexion 

18

Plantaris Muscle

What is its innervation and blood supply?

Innervation: Tibial Nerve

Blood Supply: Posterior Tibial Artery

19

What can the plantaris muscle be used for?

Reconstructive surgery of hand tendons 

Removing it doesn't affect leg that much

20

What muscles are found in the deep posterior compartment?

  • Popliteus Muscle
  • Flexor Hallicus Longus
  • Flexor Digitorum Longus
  • Tibialis Posterior 

Tibial Nerve and Posterior Tibial Vessels are also found here

21

Popliteus Muscle

What are its attachments?

Origin: Lateral aspect of lateral femoral condyle and lateral meniscus

Insertion: Posterior aspect Tibia (supeior to soleal line)

 

22

Popliteus Muscle

What is its action?

1. Unlocks extended leg by laterally rotating the femur

2. Weak Leg Flexion

23

Plantaris Muscle

What is its innervation and blood supply?

Innervation: Tibial Nerve

Blood Supply: Popliteal Artery

24

What are the terminal branches of the posterior tibial artery?

Medial and Lateral plantar arteries

25

Flexor Hallucis Longus Muscle

What are its attachments?

Origin: Posterior side of fibula

Insertion: Base of 1st distal phalanx 

(The muscle will cross the fibula to the tibula and reach the hallucis through the sustentaculum tali of the calcaneus at the medial and lateral tubercle)

26

Flexor Hallucis Longus Muscle

What is its action?

1. Flexes Great Toe

2. Plantar Flexion

27

Flexor Hallucis Longus Muscle

What is its innervation and blood supply?

Innervation: Tibial Nerve

Blood Supply: Posterior Tibial Artery

28

Flexor Digitorum Longus Muscle

What is its attachments?

Origin: Posterior tibia

Insertion: Base of 2nd-5th distal phalanges

(The muscle will cross the tibia to the fibula and pass the Tibialis Posterior)

29

Flexor Digitorum Longus Muscle

What is its action?

1. Flexes Lateral Four Digits

2. Plantar Flexion

30

Flexor Digitorum Longus Muscle

What is its innervation and blood supply?

Innervation: Tibial Nerve

Blood Supply: Posterior Tibial Artery