Leg Muscles - Post Deep

Question 1

List them

Answer 1

• FHL
• FDL
• Tibialis post
• Popliteus

Question 2

Innervation

Answer 2

Tibial n. but branches change

Question 3

FHL: origin, insertion, innervation, functions

Answer 3

Origin: post. fibula + inteross membrane
Insertion: plantar surfac of distal phalynx of hallux
Innervation: Tibial n; S2, S3
Functions:
- flex hallux
- support med longitudinal plantar arch
- imp. in walking

Question 4

FDL: origin, insertion, innervation, function

Answer 4

Origin: med. post surface of tibia 
Insertion: plantar surfaces of distal phalanges of toes 
Innervation: Tibial n; S2, S3 
Function: 
   - flex toes 
   - support med + lat plantar arches

Question 5

Tibialis post: origin, insertion, innervation, function

Answer 5

Origin: post inteross membrane + adj fibula
Insertion: navicular tuberosity + adj medial cuneiform
Innervation: Tibial n.; L4, L5
Function:
- inversion + plantarflexion of foot
- support medial arch @ walking

Question 6

Popliteus: origin, insertion, innervation, function

Answer 6

Origin: lat. femoral condyle
Insertion: post. prox tibia
Innervation: Tibial n; L4 - S1
Function:
- stabilize knee when tibia wants to rotate lat on femur
- unlock knee by rotating femur laterally