Posterior thigh and popliteal fossa

• Posterior Thigh

  •Hamstrings

  –Semitendinosus

  –Semimembranosus

  –Biceps Femoris

  •Extend hip, Flex knee
• Semitendinosus

  Ischial tuberosity        

  • Medial surface of superior tibia

  •Tibial division of Sciatic

  –L5,S1,S2

  
• Semimembranosus

  Ischial tuberosity 

  • Posterior surface of Medial Condyle of tibia

  •Tibial division of Sciatic

  –L5,S1,S2

  
• Biceps Femoris

  Long head: Ischial tuberosity

  Short head: Linea aspera and Lateral Supracondylar line of femur                     

  • Head of Fibula

  •Long head = Tibial division of Sciatic (L5,S1,S2)

  •Short head = Common peroneal division of Sciatic (L5,S1,S2)

  
• Biceps Femoris

  
• Rotation of Knee

  •When Knee is Flexed:

  –Lateral rotation by:

  •Biceps Femoris

  –Medial rotation by:

  •Semimembranosus

  •Semitendinosus

  •Gracilis

  •Sartorius

  
• Sciatic Nerve

  •Anterior rami L4-S3

  •Deep to long head of biceps femoris

  •Tibial and Common Peroneal (fibular) Divisions

  
• Popliteal Fossa – Roof

  •Deep fascia

  •Pierced by:

  –Sural nerve

  –Short saphenous vein

  
• Popliteal Fossa – Boundaries

  •Superiorly: Diverging tendons of Hamstrings

  –Biceps femoris laterally

  –Semimembranosus and Semitendinosus medially

  •Inferiorly: Medial and Lateral heads of Gastrocnemius

  
• Popliteal Fossa – Contents

  •Popliteal artery

  •Popliteal vein

  •Terminal branches of Sciatic

  –Tibial nerve

  –Common peroneal nerve

  
• Popliteal Fossa – Contents

  
• Popliteal Fossa – Floor

  •Popliteal surface of femur

  •Capsule of Knee Jt.

  •Popliteus muscle

  
• Popliteal Fossa – Floor

  •Oblique popliteal ligament

  –Expansion of Semimembranosus

  –Reinforces knee joint capsule

  •Arcuate ligament

  –Thickening of knee joint capsule where it is pierced by popliteus

  •Middle Genicular vessels

  –Pierce joint capsule to supply cruciate ligaments

  
• Popliteal Artery

  •Continuation of femoral artery

  •Adductor hiatus      

  →Inferior border of Popliteus

  •5 genicular branches

  •Terminal branches:

  –Anterior Tibial artery

  –Posterior Tibial artery

  
• Popliteal Artery