Anatomy 1 Lecture 14 - Posterior Thigh and Popliteal Fossa
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What n. supplies the skin on the posterior aspect of the thigh and over the popliteal fossa?
- The Posterior Femoral Cutaneous (S1-S3)
What are the muscles of the "hamstrings"?
- Biceps Femoris (long and short head) - more lateral
- Semimembranosus and Semitendonosus - more medial
Biceps Femoris OINA
- O: Long head-Ischial tuberosity, Short head-Linea aspera
- I: Head of fibula
- N: Long head-Tibial portion of sciatic, Short head-Common peroneal portion of sciatic
- A: Extends the thigh (Long head of biceps femoris) and Flexes the leg (all)
- O: Ischial Tuberosity
- I: Medial surface of the tibia inferior to the condyle.
- N: Tibial portion of the sciatic n.
- A: Extend thigh, Flex leg, and medially rotate the leg
- O: Ischial tuberosity
- I: Medial condyle of the tibia (above the pezansirine muscles)
- N: Tibial portion of the sciatic
- A: Extend thigh, flex leg, and medially rotate leg
What are the boundries of the popliteal fossa?
- Superior Lateral: Biceps Femoris
- Superior Medial: Semitendinosis and semimembranosus
- Inferior Lateral: Lateral head of the gastroc
- Inferior Medial: Medial head of the gastroc
What makes up the roof of the popliteal fossa?
Fascia lata with branches of the posterior femoral cutaneous n and lesser saphenous v.
What makes up the floor of the popliteal fossa?
Popliteal surface of femur, Posterior capsule of knee, Oblique popliteal ligament
What are the contents of the popliteal fossa?
The tibial nerve, the common peroneal n., the popliteal vessels, and origins of the sural n. (contributions from tibial and common peroneal that innervates the cutaneous sureface of the posterior leg and the lateral aspect of dorsum of foot)
After the femoral a. exits the adductor hiatus, what does it become? What does this new vessel become?
- The popliteal a.
- The anterior tibial artery (supplies the anterior compartment of the leg) and the posterior tibieal artery (supplies the poterior compartment, and gives rise to the peroneal a. which supplies the posterior and lateral compartments.
What are the genicualr anastomoses?
- The are the branches of the popliteal a. that surround the knee. Supply knee patella and asurrounding bone. Superior medial and lateral, and inferior medial and lateral genicular arteries.
Where does the sciatic n. end? What does it become?
- Just superior to the popliteal fossa.
- Becomes the Tibial and the common peroneal n.
Describe the tibial n.
- Most superficial component of the popliteal fossa
- Gives off serveral genicular branches
- Descendes to the posterior compartment to innervate posterior muscularture
- Gives of the medial sural cutaneous n. to help form the sural n.
Describe the common peroneal n.
- Leaves the popliteal fossa passing superficial to the lateral head of the gastroc
- Passes over the posterior aspect of the head of the fibula
- After passing the fibular head it divides into the superficial peroneal (supplies lateral compartment) and the deep peroneal (supplies the anterior compartment)
- It also gives off several genicular branches for innervation of the knee joint.
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