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Chapter 6 - Popliteal Fossa
"The popliteal artery is auscultated for measuring the blood pressure in the lower limb."
Introduction
- Popliteal fossa = Latin: hamstring of knee
- Shallow, diamond-shaped depression at the back of the knee joint
- Best felt when knee is semiflexed
- Corresponds to the cubital fossa of the forearm
Surface Landmarks
| # | Structure | Key Feature |
|---|---|---|
| 1 | Lateral & medial condyles of femur & tibia | Felt on sides and front of knee |
| 2 | Head of fibula | Bony prominence below posterolateral aspect of lateral condyle of tibia |
| 3 | Common peroneal nerve | Palpated against posterolateral neck of fibula, medial to biceps femoris tendon, finger moved upward |
| 4 | Fibular collateral ligament | Rounded cord just above fibular head in flexed knee |
| 5 | Hamstrings (knee flexed against resistance) | Semitendinosus (rounded, superficial) over semimembranosus (flat); biceps femoris laterally; groove anteriorly bounded by adductor magnus medially and iliotibial tract laterally |
| 6 | Popliteal artery pulse | Felt in middle of fossa by deep pressure |
| 7 | Gastrocnemius heads | Two rounded cushions in lower fossa, merge into calf inferiorly |
Location
- Diamond-shaped depression behind the knee joint
- Between lower part of femur and upper part of tibia
Boundaries
| Side | Structure |
|---|---|
| Superolaterally | Biceps femoris |
| Superomedially | Semitendinosus + semimembranosus + gracilis + sartorius + adductor magnus |
| Inferolaterally | Lateral head of gastrocnemius + plantaris |
| Inferomedially | Medial head of gastrocnemius |
Roof
Formed by the superficial fascia (deep fascia) over the popliteal fossa.
The roof contains:
- (a) Small saphenous vein
- (b) Three cutaneous nerves:
- Branches and terminal part of the posterior cutaneous nerve of the thigh
- Posterior division of the medial cutaneous nerve of thigh
- Peroneal or sural communicating nerve
Floor
Formed from above downwards by:
- (a) Popliteal surface of the femur
- (b) Capsule of the knee joint + oblique popliteal ligament
- (c) Popliteus muscle covered by its fascia
Contents (8 structures)
- Popliteal artery and its branches
- Popliteal vein and its tributaries
- Tibial nerve and its branches
- Common peroneal nerve and its branches
- Posterior cutaneous nerve of the thigh
- Genicular branch of the obturator nerve
- Popliteal lymph nodes
- Fat - surrounds and supports all above structures
Arrangement of Neurovascular Structures
The popliteal vessels and tibial nerve cross the fossa vertically, arranged one over the other:
- Tibial nerve = most superficial
- Popliteal vein = deep to tibial nerve
- Popliteal artery = deepest of all (artery crossed posteriorly by vein and nerve)
Relative positions (medial to lateral / front to back):
| Level | Arrangement |
|---|---|
| Upper fossa | Medial to lateral: A, V, N (Artery, Vein, Nerve) |
| Middle fossa | Behind to forwards: N, V, A (Nerve, Vein, Artery) |
| Lower fossa | Medial to lateral: N, V, A (Nerve, Vein, Artery) |
Mnemonic: AVN (upper) → NVA (lower)
- Common peroneal nerve crosses the fossa obliquely from superior angle to lateral angle, along the medial border of biceps femoris - lies in the same superficial plane as the tibial nerve.
Popliteal Artery
Beginning, Course & Termination
- Continuation of the femoral artery
- Begins at the opening in the adductor magnus (hiatus) - junction of middle one-third with lower one-third of thigh
- Runs downwards and slightly laterally to reach the lower border of popliteus
- Terminates at the lower border of popliteus by dividing into:
- Anterior tibial artery
- Posterior tibial artery
Relations
- Popliteal artery is the deepest structure in the popliteal fossa
Source: Human Anatomy - Lower Limb, Abdomen and Pelvis, Chapter 6, pp. 87-89
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Included diagrams & sections:
- Diamond boundary diagram - labeled with all 4 sides (superolaterally, superomedially, inferolaterally, inferomedially) and their muscle structures
- Roof-Floor cross-section schematic - shows the superficial fascia as the roof, N/V/A arrangement inside, and the 3-layer floor
- NVA arrangement diagram - color-coded boxes (red = artery, blue = vein, green = nerve) showing how the arrangement changes at upper, middle, and lower levels of the fossa
- Full tables for boundaries, contents (8 structures), popliteal artery details, and surface landmarks
Popliteal Fossa Quick Reference
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