Anterior and Lateral Leg

Question 1

What forms the extensor retinaculum?

Answer 1

thickening of the crural (leg) fascia

Question 2

What are the muscles of the anterior compartment of the leg? What are there key functions?

Answer 2

1. Tibialis anterior
2. Extensor hallucis longus
3. Extensor digitorum longus
4. Fibularis tertius

Functions

• Dorsiflexion
• Toe extension

Question 3

What is the function and innervation of the Tibialis Anterior Muscle?

Answer 3

Function

• Dorsiflexion and inversion of foot

Innervation

• Deep fibular Nerve

Question 4

What is the function and innervation of the Extensor Digitorum Longus?

Answer 4

Function

• Extends lateral four digits
• dorsiflexion

Innervation

• Deep Fibular Nerve

Question 5

What is the attachment, function, and innervation of Fibularis Tertius?

Answer 5

Attachment

• dorsum of fifth metatarsal base

Function

• Dorsiflexion
• Eversion

Innervation

• Deep Fibular Nerve

Question 6

What is the function and innervation of the Extensor Hallucis Longus?

Answer 6

Function

• Extend Hallux
• Dorsiflex ankle

Innervation

• Deep Fibular Nerve

Question 7

Where does the Deep fibular nerve run? What does it supply?

Answer 7

Runs

• between tibialis anterior and extensor hallucis longus. Terminates has medial and lateral terminal branches on dorsum of foot.

Supplies

• Anterior compartment muscles
• Ankle joint and metacarpal phalangeal joints
• Dorsal intrinsic foot muscles
• Skin between first and second digits

Question 8

Where does the Anterior Tibial Artery Run? Where does it terminate? What does it terminate as?

Answer 8

1) between tibialis anterior and extensor hallucis longus with deep fibular nerve.
2) ends at ankle between the two malleoli
3) Dorsalis pedis artery

Question 9

What innervates an supplies the anterior compartment of the leg?

Answer 9

Deep Fibular Nerve

Anterior Tibial Artery

Question 10

What innervates and supplies the posterior compartment of the leg?

Answer 10

Tibial Nerve

Posterior Tibial Artery

Question 11

The lateral compartment of the leg contains what?

Answer 11

Fibularis Brevis

Fibularis Longus

Superficial Fibular Nerve

Question 12

What is the function and innervation of the Fibularis Longus Muscle?

Answer 12

Function

• Eversion and plantar flexion

Innervation

• Superficial fibular Nerve

**Forms sling with Tibialis Posterior**

Question 13

What forms the groove for the fibularis longus?

Answer 13

Cuboid sulcus

Question 14

What is the function and innervation of the Fibularis Brevis Muscle?

Answer 14

Function

• Eversion
• Plantar flexion

Innervation

• Superficial Fibular nerve

Question 15

What does the superficial fibular nerve supply?

Answer 15

• Anteroinferior leg
• Nearly the entire dorsal surface of the foot
• Most of the dorsal aspect of the digits

Question 16

What is the most commonly injured lower extremity nerve? What does it result in?

Answer 16

1) common fibular nerve
2) results in paralysis of all anterior and lateral crural muscles

** loss of dorsiflexion and eversion **

Question 17

Trauma of a septa may lead to hemorage, edema, and inflammation. What is a cure for this?

Answer 17

Fasciotomy

Question 18

What are Shin splints?

Answer 18

small tears to perioseum over tibia and/or tears to overlying deep fascia.

Mild form of compartmental syndrom ( due to swelling of tibialis anterior)

All caused by repetitive ground reaction force