Popliteal lymph nodes
Nodi lymphoidei poplitei
Also known as: popliteal nodes
A small group of about 5–7 nodes in the fat of the popliteal fossa that drain the lateral foot, posterolateral calf (small saphenous territory) and deep tissues of the leg and knee.
Overview
The popliteal nodes are embedded in the fat of the popliteal fossa: a superficial node near the termination of the small saphenous vein, and deeper nodes around the popliteal vessels and the posterior capsule of the knee joint. They receive superficial lymphatics accompanying the small saphenous vein (from the lateral side of the foot and posterolateral leg) and deep lymphatics accompanying the anterior and posterior tibial vessels and from the knee joint. Their efferents ascend with the femoral vessels to the deep inguinal nodes. Healthy popliteal nodes are not palpable.
- Location
Popliteal fossa, around the termination of the small saphenous vein and alongside the popliteal artery and vein.
Anatomy
- Lymphatic drainage
Deep lymphatics with the femoral vessels → deep inguinal nodes.
Function
- Filter lymph from the lateral foot, posterolateral calf and deep structures of the leg.
Clinical significance
Palpable popliteal node
Abnormal: consider infection of the heel or lateral foot, or melanoma of the posterolateral leg or heel (sentinel node mapping may identify a popliteal sentinel node). Distinguish from a Baker (popliteal) cyst and popliteal artery aneurysm.
Compiled from standard anatomy and physiology references — see the Lymphatic & Immune System sources. For education only; not medical advice.