Muscles of the leg

Question 1

What the muscles of the anterior leg ?

Answer 1

0Extensor Digitorium Longus - (EDL) - extends 4 lateral metatarsals.

0Extensor Hallicus Longus - (EHL) - raise big toe.

0Tibialis Anterior- Inversion ( pull inner aspect of foot up) -

0 Fibularis Tertius - foot eversion
* does not exist in everyone - comes off EDL and inserts onto metarsal 5.

ALL involved in Dorsiflexion.

TA - located on lateral surface of Tibia.
Inserts onto medial surface of foot

EDL - inserts on 4 lateral metatarsals

EHL - inserts onto big toe.

Question 2

What nerve innervates the Anterior leg ?

Answer 2

Deep fibular (peroneal) nerve - branch of common fibular nerve.

Question 3

What is foot drop ?

Answer 3

Permanent foot Plantarflexion.

Damage to the common fibular nerve thus deep fibular.
Action of muscles in posterior nerve unopposed.

Interfere with walking - person may flick foor outwards while walking - Eversion Fliok.

Question 4

What the muscles of the Lateral leg ?

Places of attachment

What do they do ?

Answer 4

0 Fibularis Longus
0 Fibularis Brevis

• Both pass btw lateral malleolus & Calcenous

Brevis shorter - attaches to lateral surface of foot . Longus cross plantar surface of foot ( sole ) attaches to medial surface.

INVOLVED IN EVERSION & PLANTARFLEXION

Question 5

What nerve innervates the Lateral leg ?

Answer 5

Superfical Fibular ( peroneal) nerve - branch of common fibular nerve .

Question 6

Muscles involved in enversion of foot ?

Answer 6

Fibularis Brevis
Fibularis Longus
Fibularis Tertius

Question 7

What the muscles of the Posterior leg?

INNERVATION

Answer 7

2 compartments - Superfical and Deep

SUPERFICAL

0 Soleus

0 Gastrocnemius - 2 heads (Lateral & medial )- crosses knee

0 Calceneal tendon - provides attachment of the superfical posterior muscles to calceneous

0 Plantaris - crosses knee - absent in 10 % of pl.

• ALL involved in Plantaflexion
  Plantaris & Gastroconemius - knee flexion as well - cross knee

ORDER OF THE MUSCLES 
Most superfical - Gastro
                          - Plantaris 
                          - Calcaneous tendon
                          - Soleus 

DEEP

0 Tibilalis Posterior - pases posteriorly to medial malleolus - attaches to plantar surface of tarsal bones (sole) - inversion of foot

0 Flexor Digatorium Longus - attaches to plantar surface of lateral 4 toes. - flexion of toes

0 Flexor Hallicus Longus - attaches to plantar surface of big toe. - felxion of big toe.

• INVOLVED IN PLANTARFLEXION

0 Popliteus - rotate femur laterally on femur - unlock knee joint - allow flexion.

all innervated by TIBIAL N.

Question 8

Mucles involved in Plantarflexion of the foot ?

Answer 8

Muscles of posterior and lateral compartment.

Question 9

Mucles involved in Dosiflexion of the foot ?

Answer 9

Muscles of anterior compartment.

Question 10

What compartement involved mostly in eversion of foot ?

Answer 10

Lateral

Question 11

What compartement involved mostly in inversion of foot ?

Answer 11

Posterior