Lecture 9: Anterolateral Leg Flashcards Preview

04. MSK Exam 2 Final > Lecture 9: Anterolateral Leg > Flashcards

Flashcards in Lecture 9: Anterolateral Leg Deck (46)
Loading flashcards...
1

The Crural Frascia thickens distally into what?

What does this structure do?

Extensor Retinaculum

-prevents bowstringing during dorsiflexion

2

Why do you often see edema in the legs of elderly people?

Their crural fascia is more lax, and thus their musculovenous pump is less effective

3

How does the musculovenous pump in the leg work?

The crural fascia is tight enough that when the muscles of the leg contract, they must expand inward instead of outward. This pushes blood up the veins of the leg, since they have valves that prevent blood from seeping down the leg.

4

How would you relieve intracompartmental pressure in the leg?

Fasciotomy 

-Incise fascia to relieve pressure and prevent permanent injury

-Leg can stay open for a while 

5

What muscles do you find in the anterior compartment?

  • Tibialis Anterior Muscle
  • Extensor Hallucis Longus Muscle
  • Extensor Digitorum Longus
  • Fibularis Tertius 

6

Tibialis Anterior Muscle

What is its attachments?

Origin: Lateral Tibial Condyle 

Insertion: Medial Surface of first cuneiform and first metatarsal base 

7

Tibialis Anterior Muscle

What is its action?

1. Inversion of Foot

2. Dorsiflexion of Foot

8

Tibialis Anterior Muscle

What is its innervation and blood supply?

Innervation: Deep Fibular Nerve 

Blood Supply: Anterior Tibial Artery

9

Extensor Digitorum Longus Muscle

What is its attachments?

Origin: Lateral Tibial Condyle and Medial Aspect of Fibula; Interosseus Membrane

Insertion: 2nd-5th intermediate and distal phalanges

10

Extensor Digitorum Longus​ Muscle

What is its action?

1. Extends lateral four digits

2. Dorsiflexion of Foot

11

Extensor Digitorum Longus​ Muscle

What is its innervation and blood supply?

Innervation: Deep Fibular Nerve 

Blood Supply: Anterior Tibial Artery

12

Extensor Hallucis Longus Muscle

What is its attachments?

Origin: Anterior Aspect of Fibula; Interosseus Membrane

Insertion: Base of Distal Phalanx of Hallux 

13

Extensor Hallucis Longus​ Muscle

What is its action?

1. Extends hallux 

2. Dorsiflexion of Ankle

14

Extensor Hallucis Longus​ Muscle

What is its innervation and blood supply?

Innervation: Deep Fibular Nerve 

Blood Supply: Anterior Tibial Artery

15

Fibularis Tertius​ Muscle

What is its attachments?

Origin: Anteroinferior Aspect of Fibula

Insertion: Dorsum of 5th metatarsal base 

16

Fibularis Tertius​ Muscle

What is its action?

1. Eversion 

2. Dorsiflexion of Ankle

17

Fibularis Tertius​​ Muscle

What is its innervation and blood supply?

Innervation: Deep Fibular Nerve 

Blood Supply: Anterior Tibial Artery

18

What muscle does the Fibularis Tertius tend to fuse with?

Extensor Digitorum Longus

19

Where does the common fibular nerve split into the superficial and deep branches?

Between the Fibula and Fibularis Longus Muscle

-Around the head of the fibula

20

What artery runs with the Deep Fibular Nerve?

The Anterior Tibial Artery

21

What does the Deep Fibular Nerve innervate?

  • Anterior Compartment Muscles
  • Ankle joint and metacarpal phlanageal joints

22

What are the terminal branches of the deep fibular nerve?

Medial and Lateral branches of the Deep Fibular Nerve at the dorsum of the foot 

23

What is the function of the Lateral Branch of the Deep Fibular Nerve?

Innervates the intrinsic muscles of the dorsum of the foot

  • Extensor Hallucis Brevis
  • Extensor Digitorum Brevis

24

What is the function of the Medial Branch of the Deep Fibular Nerve?

Sensory innervation to the flip flop area

(medial branch innervates part of the medial two toes)

25

What artery supplies the anterior compartment?

Where does it come from?

Anterior Tibial Artery arises from Popliteal Artery and passes anteriorly via Interosseous Membrane

26

What is the terminal branch of the Anterior Tibial Artery?

Dorsalis Pedis

Ends at ankle between malleoli

27

What does "peroneal" mean?

Fibular

28

What structures do you find in the lateral compartment?

  • Fibularis Brevis
  • Fibularis Longus
  • Superficial Fibular Nerve

29

Fibularis Longus​ Muscle

What is its attachments?

Origin: Head and Superior aspect of Fibula

Insertion: Base of 1st metatarsal and medial cuneiform 

30

Fibularis Longus​ Muscle

What is its action?

1. Eversion 

2. Plantar Flexion of Ankle