Deep Posterior Compartment Leg

Question 1

Tibialis posterior insertion

Answer 1

Navicular tuberosity;
cuneiforms (medial, intermediate, and lateral)
2nd to 4th metatarsals (bases)

Question 2

Tibialis posterior innervation

Answer 2

Tibial n (L4,L5)

Question 3

Tibialis posterior action

Answer 3

Talocrural joint: plantar flexion
Subtalar joint: inversion (supination)
Supports longitudinal and transverse arches

Question 4

Flexor digitorum longus origin

Answer 4

Tibia (middle 1/3 of posterior surface)

Question 5

Flexor digitorum longus insertion

Answer 5

2nd to 5th distal phalanges (base)

Question 6

Flexor digitorum longus and flexor hallicis longus innervation

Answer 6

Tibial n L5-S2

Question 7

Flexor digitorum longus action

Answer 7

Talocrural joint: plantar flexion
Subtalar joint: inversion
MTP and IP joints of the 2nd to 5th toes; plantar flexion

Question 8

Flexor hallicis longus origin

Answer 8

Fibula (distal 2/3rds of posterior surface) adjacent interosseous membrane

Question 9

Flexor hallicis longus insertion

Answer 9

1st distal phalanx (base)

Question 10

Flexor hallicis longus action

Answer 10

Talocrural joint: plantar flexion
Subtalar joint: inversion (supination)
MTP and IP joints of the 1st toe; plantar flexion
Supports the medial longitudinal arch

Question 11

Popliteus origin

Answer 11

Lateral femoral condyle

Posterior horn of the lateral meniscus

Question 12

Popliteus insertion

Answer 12

Posterior tibial surface (above the origin at the soleus)

Question 13

Popliteus innervation

Answer 13

Tibial n (L4-S1)

Question 14

Popliteus action

Answer 14

Knee joint: flexion and internal rotation (stabilizes the knee)

Question 15

Tibialis posterior origin

Answer 15

Interosseous membrane, adjacent borders of tibia and fibula