Anterior Leg

Question 1

What are the 4 muscles in the anterior compartment of the leg?

Answer 1

• Tibialis anterior
• Extensor Digitorum Longus
• Extensor Hallucis Longus
• Fibularis tertius

Question 2

How do we test the power of Tibialis Anterior?

Answer 2

• Stand on heels

Question 3

Tibialis Anterior -

• Attachment
• Action (2)
• Inneveration
• Blood supply

Answer 3

• Attachment: Lateral surface of tibia - medial cuneiform/MT 1
• Action: Dorsiflexion and inversion
• Innervation: Deep fibular (personeal) - L4,L5
• Blood supply: Anterior Tibial

Question 4

Extensor Digitorum Longus (EDL) lies ………. and ……… to the tibialis anterior

Answer 4

• Lateral
• Deep

Question 5

Extensor Hallucis Longus is located ……….. to EDL and TA

Answer 5

• Deep

Question 6

Extensor Digitorum Longus & Extensor Hallucis Longus:

• Attachment (2)
• Actions: (3)
• Innervation:
• Blood supply

Answer 6

• Attachment:
  
  • EDL: Lateral condyle, medial surface of fibula, interosseous membrane - 4 lateral toes
  • EHL: Medial surface of fibula shaft - Great toe
• Actions:
  
  • BOTH: Dorsiflexion
  • EDL: Extension of lateral toes
  • EHL: Extension of great toe
• Innervation:
  
  • Deep fibular (peroneal) nerve - L4/L5
• Blood supply:
  
  • Anterior tibial

Question 7

Fibularis Tertius:

• Attachment
• Actions (2)
• Innervation
• Blood supply

Answer 7

• Attachment: Medial surface of fibula - metatarsal V
• Actions: Dorsiflexion and eversion
• Innervation: Deep fibular (peroneal) nerve
• Blood supply: Anterior tibial

Question 8

Clinical Relevance: Give 2 reasons why footdrop occurs

Answer 8

1. Paralysis of muscles - anterior compartment of leg
2. Damage to common fibular (peroneal nerve)

Question 9

Clinical Relevance: Give 2 conseqeunces of footdrop

Answer 9

1. Permanent plantarflexion - limb drags along ground
2. Eversion flick - flick foot outwards