Leg Posterior Compartment Muscles

Question 1

flexor digitorum longus attachments

Answer 1

from the posterior tibia distal to the soleal line to the plantar surface of the distal phalangeal bases

(POSTERIOR- DEEP)

Question 2

flexor digitorum longus actions

Answer 2

plantar flexes ankle, and flexes digits 2-5 (MP & IP)

Question 3

flexor digitorum longus innervation

Answer 3

tibial nerve (L5-S1-S2)

Question 4

flexor hallucis longus attachments

Answer 4

from the distal 2/3rds of the posterior fibular surface & crural interosseous membrane to the plantar aspect of the distal phalangeal base of the 1st toe

Question 5

flexor hallucis longus actions:

Answer 5

plantar flexes ankle, and flexes great toe (MP & IP)

Question 6

flexor hallucis longus innveration

Answer 6

tibial nerve (L5-S1-2)

Question 7

gastrocnemius attachments: (lateral and medial heads)

Answer 7

from the posterior aspect of the femoral condyles and joint capsule to the posterior calcaneal surface via the calcaneal tendon

(POST- SUPERFICIAL)

Question 8

gastrocnemius actions

Answer 8

flexes the knee, plantar flexes the ankle

Question 9

gastrocnemius innervation

Answer 9

tibial nerve (S1-S2)

Question 10

soleus attachments

Answer 10

from the posterior aspect of the head & proximal 1/4th of the fibula & tibial soleal line to the posterior calcaneal surface via the calcaneal tendon

Question 11

soleus actions

Answer 11

plantar flexes the anke

Question 12

soleus innervation

Answer 12

tibial nerve (L5-S1-2)

Question 13

tibialis posterior attachments

Answer 13

from the crural interosseous membrane, lateral tibial surface & medial fibular surface to the navicular, medial & intermediate cuneiforms and bases of metatarsals 2-4

(DEEP COMPARTMENT)

Question 14

tibialis posterior actions:

Answer 14

• inverts foot and plantar flexes ankle

Question 15

tibialis posterior innervation

Answer 15

tibial nerve (L4-L5-S1)

Question 16

popliteus attachments

Answer 16

from the lateral femoral condyle and oblique popliteal ligament to the soleal line of the tibia

Question 17

popliteus actions:

Answer 17

in NWB, medial rotation of tibia and knee flexion; in WB insertion is fixed: lateral rotation of femur and knee flexion; thus, it unlocks the knee from extension into early flexion

Question 18

popliteus innervation:

Answer 18

tibial nerve (L4-5-S1)

Question 19

plantaris attachments

Answer 19

from the lateral supracondylar line to the posterior calcaneal surface

Question 20

plantaris actions

Answer 20

flexes knee, plantar flexes ankle

Question 21

plantaris innervation

Answer 21

tibial nerve (L4-5-S1)