Posterior Thigh and Popliteal Fossa Anatomy

Vocabulary flashcards covering the anatomy of the posterior thigh muscles, the boundaries and contents of the popliteal fossa, and associated neurovascular structures.

Posterior Thigh Region

The area lying posterior to the femur and the medial and lateral intermuscular septa, primarily composed of hip extensors and knee flexors.

Profunda femoris

The source of perforating arteries that provide the vascular supply to the posterior thigh.

Hamstring muscle group

A group of muscles that originate from the ischial tuberosity and are supplied by the tibial nerve portion of the sciatic nerve.

Semitendinosus

A hamstring muscle with a slim, tendinous distal portion commonly used in ACL autograft reconstructions.

Pes anserinus

The common insertion point on the anterior tibia for the sartorius, gracilis, and semitendinosus muscles.

Semimembranosus

A broad hamstring muscle located deep to the semitendinosus that inserts inferior to the medial condyle.

Biceps Femoris Long Head

A component of the hamstring group that runs laterally from the ischial tuberosity to the lateral surface of the head of the fibula.

Biceps Femoris Short Head

A muscle originating off the distal half of the femoral shaft (lateral to the linea aspera) that does not contribute to hip extension and is innervated by the common fibular nerve.

Popliteal Fossa

A diamond-shaped, soft-tissue-protected gateway posterior to the knee joint through which all neurovascular structures pass deep into the leg.

Superomedial wall

The border of the popliteal fossa formed by the semimembranosus muscle.

Superolateral wall

The border of the popliteal fossa formed by the biceps femoris muscle.

Inferomedial wall

The border of the popliteal fossa formed by the medial head of the gastrocnemius.

Inferolateral wall

The border of the popliteal fossa formed by the lateral head of the gastrocnemius and the plantaris (if present).

Popliteal fascia

The strong roof of the popliteal fossa that limits space expansion; tension here during abscesses or aneurisms causes significant pain, especially in full extension.

Tibial Nerve

The most superficial central component of the popliteal fossa, crossing at the midline and running distally within the deep posterior compartment.

Common Fibular Nerve

A branch of the sciatic nerve that follows the superolateral wall and curves superficial to the fibular neck.

Popliteal Artery

The deepest component of the popliteal fossa and a continuation of the femoral artery past the adductor hiatus.

Genicular branches

Four arterial branches from the popliteal artery that anastomose around the knee to maintain collateral circulation.

Tendinous arch of the soleus

The structure through which the popliteal artery passes to enter the posterior compartment of the leg.

Popliteal Vein

A vessel running superficial to the popliteal artery that receives the small saphenous vein.

Superficial popliteal lymph nodes

Lymph nodes located superficial to the popliteal fossa that drain cutaneous tissue.

Deep popliteal lymph nodes

Lymph nodes surrounding the deep vessels that receive drainage from muscular compartments and the knee joint capsule, eventually draining to deep inguinal lymphatics.