Posterior Thigh and Popliteal Fossa Flashcards
What is this muscle?
Semitendinosus
What is the origin of the semitendinosus?
Ischial tuberosity
What is the insertion of the semitendinosus?
Medial surface of superior tibia
What is the innervation of the semitendinosus?
Tibial division of sciatic nerve (L5,S1,2)
What is the function of the semitendinosus?
- Extend hip
- Flex knee
What is this muscle?
Semimembranosus
What is the origin of the semimembranosus?
Ischial tuberosity
What is the insertion of the semimembranosus?
Posterior surface of medial condyle of tibia
What innervates the semimembranosus?
Tibial division of sciatic (L5,S1,2)
What is the function of the semimembranosus?
- Extend hip
- Flex knee
What is this muscle?
Biceps femoris
medial long head
lateral short head
What is the origin of the biceps femoris?
Long head - Ischial tuberosity
Short head - Linea aspera, lateral supracondylar line of femur
What is the insertion of biceps femoris?
Head of fibula
What innervates the long head of the biceps femoris?
Tibial division of sciatic (L5,S1,2)
What innervates the short head of the biceps femoris?
Common peroneal division of sciatic (L5,S1,2)
What laterally rotates the knee when flexed?
Biceps femoris
What medially rotates the knee when flexed?
- Semimembranosus
- Semitendinosus
- Gracilis
- Sartorius
What forms the roof of the popliteal fossa?
Deep fascia
What pierces the roof of the popliteal fossa?
- Sural nerve
- Short saphenous vein
What forms the superior boundary of the popliteal fossa?
Diverging hamstring tendons
What forms the lateral boundary of popliteal fossa?
Biceps femoris
What forms the medial boundary of popliteal fossa?
- Semimembranosus
- Semitendinosus
What forms the inferior boundary of popliteal fossa?
Medial and lateral heads of gastrocnemius
What are the contents of the popliteal fossa?
- Popliteal artery
- Popliteal vein
- Terminal branches of sciatic (tibial and common peroneal nerve)
What forms the floor of the popliteal fossa?
- Popliteal surface of femur
- Capsule of knee joint
- Popliteus muscle
What is the oblique popliteal ligament?
Expansion of the semimembranosus
What is the function of the oblique popliteal ligament?
Reinforces knee joint capsule
What is the arcuate ligament?
thickening of knee joint capsule where it gets pierced by popliteus
What are the terminal branches of the popliteal artery?
- Anterior tibial artery
- Posterior tibial artery
