Posterior Compartment of Leg Muscles

Question 0

Insertion of Gastrocnemius

Answer 0

Posterior surface of Calcaneus via Calcaneal Tendon

Question 1

Origin of Gastocnemius

Answer 1

Lateral- Lateral aspect of Lateral Condyle of Femur

Medial- Popliteal surface of Fibula, Superior to Medial Condyle

Question 2

Innervation of Gastrocnemius

Answer 2

Tibial Nerve S1S2

Question 3

Action of Gastrocnemius

Answer 3

Plantarflexes Ankle when Knee is Extended
Raises Heel during Walking
Flexes Knee Joint

Question 4

Origin of Soleus

Answer 4

Posterior aspect of Head of Fibula
Superior Quarter of Posterior surface of Fibula
Soleal Line
Medial border of Tibia

Question 5

Insertion of Soleus

Answer 5

Posterior surface of Calcaneus via Calcaneal Tendon

Question 6

Innervation of Soleus

Answer 6

Tibial Nerve S1S2

Question 7

Action of Soleus

Answer 7

Plantarflexes Ankle

Steadies Leg on Foot

Question 8

Origin of Plantaris

Answer 8

Inferior end of Later Supracondylar Line of Femur

Oblique Popliteal Ligament

Question 9

Insertion of Plantaris

Answer 9

Posterior surface of Calcaneus via Calcaneal Tendon

Question 10

Innervation of Plantaris

Answer 10

Tibial Nerve S1S2

Question 11

Action of Plantaris

Answer 11

Weakly assists Gastrocnemius in Plantarflexing Ankle

Function is probably mainly Proprioceptive

Question 12

Origin of Popliteus

Answer 12

Lateral surface of Lateral Condyle of Femur

Lateral Meniscus

Question 13

Insertion of Popliteus

Answer 13

Posterior surface of Tibia

Superior to Soleal Line

Question 14

Innervation of Popliteus

Answer 14

Tibial Nerve L4 L5 S1

Question 15

Action of Popliteus

Answer 15

Weakly Flexes Knee and unlocks it by Laterally Rotating Femur on fixed Tibia
May also Medially Rotate Tibia of unplanted Limb

Question 16

Origin of Flexor Hallucis Longus

Answer 16

Inferior Two Thirds of Posterior surface of Fibula

Inferior part of Interosseous Membrane

Question 17

Insertion of Flexor Hallucis Longus

Answer 17

Base of Distal Phalanx of Hallux

Question 18

Innervation of Flexor Hallucis Longus

Answer 18

Tibial Nerve S2 S3

Question 19

Action of Flexor Hallucis Longus

Answer 19

Flexes Great Toe at all Joints
Weakly Plantarflexes Ankle
Supports Medial Longitudinal Arch of Foot

Question 20

Origin of Flexor Digitorum Longus

Answer 20

Medial part of Posterior surface of Tibia Inferior to Soleal Line
By a Broad Tendon to the Fibula

Question 21

Insertion of Flexor Digitorum Longus

Answer 21

Bases of Distal Phalanges of Lateral Four Digits

Question 22

Innervation of Flexor Digitorum Longus

Answer 22

Tibial Nerve S2 S3

Question 23

Action of Flexor Digitorum Longus

Answer 23

Flexes Lateral Four Digits
Plantarflexes Ankle
Supports Longitudinal Arches of Foot

Question 24

Origin of Tibialis Posterior

Answer 24

Interosseous Membrane
Posterior surface of Tibia Inferior to Soleal Line
Posterior surface of Fibula

Question 25

Insertion of Tibialis Posterior

Answer 25

Primarily to Tuberosity of Navicular
Cuneiforms
Cuboid
Bases of 2nd-4th Metatarsals

Question 26

Innervation of Tibialis Posterior

Answer 26

Tibial Nerve L4 L5

Question 27

Action of Tibialis Posterior

Answer 27

Plantarflexes Ankle
Inverts Foot
Supports Medial Longitudinal Arch of Foot