Lower Leg Muscles GA2

Question 1

Muscles of Anterior Compartment
(All Deep Fibular Nerve)
Tibialis Anterior M.
Extensor Digitorum Longus M.
Extensor Hallucis Longus M.
Fibularis Tertius M.

Answer 1

All of these muscles Dorsiflex the ankle and indicudually have specifc functions on the ankle

Question 2

Tibialis Anterior M.
(Anterior Compartment)

Answer 2

Attach: Lateral condyle and superior half of the lateral surface of tibia and interosseous membrane TO medial and inferior surface of medial cunieform and base of first metatarsal

Movmvent: Dorsiflexes ankle and inverts foot

Nerve: Deep Fibular Nerve

Question 3

Extensor Digitorum Longus M.
(Anterior Compartment)

Answer 3

Attach:Lateral condyle of the tibia and superior 3/4 of medial surface of fibula and interosseous membrane TO middle and distal phalanges of lateral four digits

Movmvent: Extends lateral four digits and dorsiflexes ankle

Nerve: Deep Fibular Nerve

Question 4

Extensor Hallucuis Longus M.
(Anterior Compartment)

Answer 4

Attach: Middle part of the anterior surface of fibula and interosseous membrane TO Dorsal aspect of base of distal phalanx of great toe (hallux)

Movmvent: Extends Great Toe and dorsiflexes ankle

Nerve: Deep Fibular Nerve

Question 5

Fibularis Tertius M.
(Anterior Compartment)

Answer 5

Attach: Inferior third of anterior surface of fibula and interosseous membrane TO dorsum of base of 5th metatarsal

Movmvent: Dorsiflexes ankle and aids in eversion of the foot

Nerve: Deep Fibular Nerve

Question 6

Muscles of Lateral Compartment
(All superfical fibular nerve (L5-S2)
Fibularis Longus M.
Fibularis Brevis M.

Answer 6

All muscles in the lateral compartment everts foot and weakly plantarflexes the ankle

Question 7

Fibularis Longus M.
(Lateral Compartment)

Answer 7

Attach: Head and superior 2/3rds of lateral surface of the fibula TO base of 1st metatarsal and medial cunieform

Movmvent: Everts foot and weakly plantarflexes ankle

Nerve: Superficial Fibular Nerve

Question 8

Fibularis Brevis M.
(Lateral Compartment)

Answer 8

Attach: Inferior 2/3rds of lateral surface of of the fibula TO dorsal surface of tuberosity on the lateral side of base of 5th metatarsal

Movmvent: Everts foot and weakly plantarflexes ankle

Nerve: Superficial Fibular Nerve

Question 9

Muscles of the Superficial Posterior Compartment
(All innervated by Tibial Nerve (L4-S3))
Gastrocnemius M.
Soleus M.
Plantaris M.

Answer 9

All of the muscles in the superficial posterior compartment assist in plantarflexion and individually have own specifc functions

Question 10

Gastrocnemius M.
(Superifical Posterior Compartment)

Answer 10

Attach:
-Lateral Head: lateral aspect of lateral condyle of femur
-Medial Head: popliteal surface of femur superior to medial condyle
BOTH TO –> Posterior Surface of calcaneus via calcaneal tendon

Movmvent: Plantarflexes ankle when knee is extended , rasies heel during walking , flexes leg at knee joint

Nerve: Tibial Nerve

Question 11

Soleus M.
(Superifical Posterior Compartment)

Answer 11

Attach: Posterior Aspect of head and superior quarter of posterior surface of fibula , soleul line, and middle third of medial boarder of tibia , and tendinous arch extending between bony attchments TO Posterior Surface of calcaneus via calcaneous tendon

Movmvent: Plantarflexes ankle independent of postion of knee , stedies leg on the foot

Nerve: Tibial Nerve

Question 12

Plantaris
(Superifical Posterior Compartment)

Answer 12

Attach:Inferior end of lateral supracondylar line of femur oblique politeal ligament TO posterior Surface of calcaneus via calcaneal tendon

Movmvent: Weakly assists gastrocnemius in plantarflexing ankle

Nerve: Tibial Nerve

Question 13

Muscles of Deep Posterior Compartment
(All innervated by Tibial Nerve)
Popliteus M.
Flexor Hallucis Longus M.
Flexor Digitorum Longus M.
Tibialis Posterior M.

Answer 13

Popliteus M.
Flexor Hallucis Longus M.
Flexor Digitorum Longus M.
Tibialis Posterior M.

Question 14

Popliteus M.
(Deep Posterior Compartment)

Answer 14

Attach:Lateral Surface of lateral condyle of femur and lateral meniscus TO Posterior surface of tibia and superior soleul line

Movmvent: Weakly flexes knee and unlocks it by rotating femur 5 degrees on fixed tibia, medially rotates tibia of unplanted limb

Nerve: Tibial Nerve (L4-S3)

Question 15

Flexor Hallucis Longus M.
(Deep Posterior Compartment)

Answer 15

Attach: Inferior 2/3rds of posterior surface of fibula , inferior part of interosseous membrane TO base of distal phalanx of great toe (hallux)

Mvmnet:Flexes great toe at all joints, weakly plantarflexes ankle, supports medial longitudional arch of foot

Nerve: Tibial Nerve

Question 16

Flexor Digitorum Longus M.
(Deep Posterior Compartment)

Answer 16

Attach: Medial part of posterior surface of tibia inferior to soleul line, by broad tendon of fibula TO bases of distal phalanges of lateral four digits

Mvmnet: Flexes lateral four digits , plantarflexes ankle, supports longtiudional arches of foot

Nerve: Tibial Nerve

Question 17

Tibialis Posterior M.
(Deep Posterior Compartment)

Answer 17

Attach: Interosseous membrane , posterior surface of tibia inferior to soleal line , posterior surface of fibula TO, tuberosity of navicular cuneiform , cuboid, and sustentaculum tail of calcaneous , bases of 2nd , 3rd, and 4th metatarsals

Mvmnet: Plantarflexes ankle , inverts foot

Nerve: Tibial Nerve