who delimit the perimeter of the popliteal fossa
lateral - medially - distally - roof - floor
- lateral: biceps femoris
- medially: semimembranosus and tendons of the pes anserine
- distally: two heads of the gastrocnemius
- roof: deep fascia
- floor: popliteal surface of the femur, the posterior capsule and the popliteus muscle
semimembranosus, origin and attachment
- upper and lateral impressions on the ischial tuberosity
- groove on the posteromedial aspect of the tibia
Directly posteriorly a robust expansion called the __________ passes proximally and laterally and blends with the posterior capsule and arcuate ligament from the lateral side
oblique popliteal ligament
The nerve supply to the hamstring muscles
tibial branch of the sciatic nerve
gracilis muscle, origin and attachment
- inferior pubic ramus
- long tendon that lies medial to the tendon of the semitendinosus
gracilis muscle innervation
obturator nerve
sartorius muscle, origin and attachment
- anterior superior iliac spine
- subsartorial canal
- inserting directly into the tibia, fibers blend with layer 1
sartorius muscle innervation
femoral nerve
semitendinosus muscle, origin and attachment
- ischial tuberosity
- medially on the surface of the semimembranosus
Together the tendons of the sartorius, gracilis, and semitendinosus form the _______
pes anserinus
The ______ lies superficially and covers the insertions of the gracilis and semitendinosus.
sartorius tendon expansion
The semitendinosus inserts into the tibia just _____ to the gracilis
distal
where is the most proximal point of insertion of the pes anserinus
19 mm distal and 22.5 mm medial to the apex of the tibial tubercle
the function of the muscles that are inserted in the the pes anserinus
flex and internally rotate the knee
adductor magnus, origin and attachment
- 2 parts: ischiopubic ramus (adductor portion) / tuberosity of the ischium (hamstring portion)
- adductor tubercle on the medial condyle of the femur
adductor magnus innervation
- adductor portion –> obturator nerve
- hamstring portion –> sciatic nerve
gastrocnemius muscle, origin and attachment
ORGIN
- lateral head –> lateral aspect of the lateral femoral condyle
- medial head –> popliteal surface of the femur / medial aspect of the medial femoral condyle
ATTACHMENT
- common tendon with the soleus, inserts into the tendo calcaneus
plantaris muscle, origin and attachment
- lateral supracondylar line of the femur deep to the lateral head of the gastrocnemius
- Tendo calcaneus (medial side, deep to gastrocnemius tendon)
soleus, origin and attachment
ORGIN
- posterior surface of the shaft and head of the fibula
- soleal line of the posterior surface of the tibia
ATTACHMENT
- deep surface of the Achilles tendon
The gastrocnemius, plantaris, and soleus are innervated by
tibial nerve
