Posterior compartment of the leg

Question 1

What is the origin and insertion, location, function, nerve and nerve root supply of the PLANTARIS MUSCLE?

Answer 1

Plantaris muscle is located behind the knee deep to the gastrocnemius muscle. O: lateral femoral condyle It passes right behind the knee joint and sends a long tendon to insert into the calcaneal tendon Supply by the tibial nerve S1, S2, posterior tibial artery and peroneal artery

Question 2

The anterior compartment of the leg is supply by which nerve and vascular structure?

Answer 2

FEET is supplied by the deep fibular nerve and perforating branches of the anterior tibial artery.

Question 3

Which nerve and blood vessels suppply the lateral compartment of the leg ?

Answer 3

The Fibularis Longus and Brevis muscle

is supply by the

• superficial fibular nerve

They receive their arterial supply

from perforating branches of

anterior tibial and peroneal arteries

Question 4

Tibialis Posterior O, I, Fx, Ns & r

Answer 4

Origin: Interosseous membrane and adjacent tibia and fibula

Travels behind the medial malleolus to the sole of the foot to insert into the tuberosity of navicular and medial Cuniform bone.

Tibial nerve, L4-L5

Posterior tibial artery

and

peroneal artery

Support medial arch of foot

Plantar flexion and Inversion

Question 5

The deep muscles in the posterior compartment of the leg? Attachments, function, nerve and vascular supply

Answer 5

Popliteus Muscle

O: Lateral femoral condyle

I: Posterior surface of proximal tibia

• Tibial nerve (L4 to S1) -Stabilizes knee joint (resists lateral rotation of tibia on femur) - Unlocks knee joint (laterally rotates femur on fixed tibia)

Flexor hallucis longus

O: Posterior surface of fibula and adjacent interosseous membrane

I: Plantar surface of distal phalanx of great toe

• Tibial nerve (S2, S3)
• Flexes great toe

Flexor digitorum longus

• O:Medial side of posterior surface of the tibia
• I: Plantar surfaces of bases of distal phalanges of the lateral four toes
• Tibial nerve (S2, S3)
• Flexes lateral four toes

Tibialis posterior

-O:Posterior surfaces of interosseous membrane and adjacent regions of tibia and fibula

I: Mainly to tuberosity of navicular and adjacent region of medial cuneiform Tibial nerve (L4, L5)

-Inversion and plantarflexion of foot; support of medial arch of foot during walking

Question 6

Which muscle support the medial arch during walking, and invert and plantar flex the foot

Answer 6

Tibialis posterior

Question 7

Gastronemius

Plantaris

Soleus

Answer 7

Gastrocnemius

Medial head

—posterior surface of distal femur just superior to medial condyle;

lateral head

—upper posterolateral surface of lateral femoral condyle

Inserts into the calcaneal tendon, to posterior surface of calcaneus

Tibial nerve (S1, S2)

Plantarflexes foot and flexes knee

Posterior Tibial artery & Fibular artery

Plantaris

Inferior part of lateral supracondylar line of femur and oblique popliteal ligament of knee

Insert

Via calcaneal tendon, to posterior surface of calcaneus

Tibial nerve (S1, S2)

Plantarflexes foot and flexes knee

Soleus

Soleal line and medial border of tibia;

posterior aspect of fibular head and adjacent surfaces of neck and proximal shaft; tendinous arch between tibial and fibular attachments

Tibial nerve,

plantar flexes the foot

Supply by the posterior tibial artery and fibular artery

Question 8

Describe the course of the posterior artery

Answer 8

Posterior Compartment of the Leg

Tibial Nerve & Sural Nerve

Posterior Tibial Artery

a) Fibula Artery & Perforating branches

The posterior tibial artery supply the posterior & lateral compartment of the leg. It runs superficially to the Tibialis Posterior and Flexor Digitorum Longus

The Fibula artery run medially to the fibula and sends branches to supply the Fibularis muscles on the lateral compartment of the leg.

Fibula Artery gives off Perforating Branches that run down the lateral compartment to the distal tibia and fibula and terminating at the calcalneous.

Question 9

Nerves in the posterior compartment of the leg?

Arterial supply to the muscles in this compartment?

Answer 9

Tibial nerve

Posterior tibial artery and fibular artery are the key nerves that run through this compartment and supplies this compartment of the leg.

Question 10

Actions of the posterior leg muscles

Answer 10

planterflex, invert the ankle or flex the toes