---
title: "Popliteal Artery | Anatomy and Physiology I"
description: "Popliteal artery is the main artery behind the knee, continuing from the femoral artery to supply the lower leg, knee, and foot in Anatomy and Physiology I."
canonical: "https://fiveable.me/anatomy-physiology/key-terms/popliteal-artery"
type: "key-term"
subject: "Anatomy and Physiology I"
unit: "Unit 20"
---

# Popliteal Artery | Anatomy and Physiology I

## Definition

The popliteal artery is the main artery behind your knee. In Anatomy and Physiology I, it is the continuation of the femoral artery after the adductor hiatus and a major blood supply to the leg and foot.

## What It Is

The popliteal artery is the large artery that runs through the back of the knee, called the popliteal fossa. In Anatomy and Physiology I, you usually meet it as the direct continuation of the femoral artery after the vessel passes through the adductor hiatus in the thigh.

That transition matters because the femoral artery does not stop at the knee. It changes name as it moves into a new anatomical region, and the popliteal artery becomes the main pathway carrying oxygenated blood toward the lower leg and foot. If you are tracing blood flow from the heart, this is one of the big route markers you need to know.

The popliteal artery sits deep in the knee region, protected by surrounding muscles and connective tissue. That deep placement is useful because the knee bends constantly, so the vessel has to travel in a way that lets the joint move without crushing the artery every time you squat, walk, or kneel. Its location also makes it harder to feel at the surface than arteries like the radial pulse at the wrist.

From the popliteal artery, blood continues into branches that serve the knee joint and then split farther down the leg. Those branches eventually connect to the anterior and posterior tibial arteries, which carry blood into the lower leg and foot. So when you see the popliteal artery on a diagram, think of it as a major junction point, not just a single stretch of vessel.

A common point of confusion is that the popliteal artery is not a separate system from the femoral artery. It is part of the same continuous route. The name changes because anatomy is organized by body region, so the same vessel gets a new label once it passes through the adductor hiatus and enters the popliteal region.

## Why It Matters

The popliteal artery matters because it ties together two big ideas in Anatomy and Physiology I, blood flow pathways and regional anatomy. If you can trace this vessel, you can trace how oxygenated blood gets from the thigh into the lower leg, which is exactly the kind of route tracing teachers love to ask about.

It also helps you make sense of vessel naming. A lot of A&P feels like memorizing random labels, but the popliteal artery shows that names often change when a vessel enters a new region. That pattern shows up again and again in the circulatory system, so once you understand one example, other pathways make more sense.

The popliteal artery is also useful for connecting structure to function. Because it lies deep behind the knee, it is protected during movement, but that same location means injury or swelling around the knee can affect blood flow to the lower limb. In class, that can come up in diagrams, movement questions, or clinical-style scenarios about circulation below the knee.

If you are studying circulatory pathways, this artery helps bridge the thigh vessels to the tibial arteries. That makes it a good checkpoint when you are memorizing the route from the abdominal aorta down to the foot.

## Connections

### [Femoral Artery](/anatomy-physiology/key-terms/femoral-artery)

The femoral artery is the vessel that becomes the popliteal artery after it passes through the adductor hiatus. If you are tracing blood flow, femoral is the name you use in the thigh, and popliteal is the name you use behind the knee. Knowing both helps you follow the same vessel across body regions without losing the route.

### Adductor Hiatus

The adductor hiatus is the opening in the adductor magnus muscle where the femoral artery travels from the thigh into the back of the knee. This is the exact anatomical point where the vessel changes from femoral artery to popliteal artery. It is a small structure, but it matters a lot for understanding vessel naming and route tracing.

### Tibial Arteries

The tibial arteries come after the popliteal artery and carry blood farther down the lower leg. In a circulation pathway, the popliteal artery is the upstream route that feeds the anterior tibial artery and posterior tibial artery branches. If you can place popliteal correctly, the rest of the lower-limb pathway is easier to organize.

### [abdominal aorta](/anatomy-physiology/key-terms/abdominal-aorta)

The abdominal aorta sits much farther upstream in the main systemic pathway, but it is part of the route that eventually supplies the popliteal artery. Blood leaves the heart, enters the aorta, travels through major downstream vessels, and eventually reaches the lower limb. This connection helps you see the popliteal artery as part of a full body-wide flow path, not an isolated vessel.

## On the AP Exam

A quiz or diagram label might ask you to identify the popliteal artery on a posterior knee image, trace blood flow from the femoral artery into the lower leg, or explain where the femoral artery changes name. You may also see it in a circulation-order question, where you have to put vessels in sequence from the heart to the foot.

In short-answer responses, use the term to show that you know both location and function. A strong answer says it is the artery behind the knee, that it continues from the femoral artery through the adductor hiatus, and that it supplies blood to the knee and lower leg. If a lab model or bone-and-muscle diagram is involved, point to the popliteal region and identify the vessel by its position, not just by memory.

## popliteal artery vs Popliteal Vein

The popliteal artery and popliteal vein run through the same general area behind the knee, so they are easy to mix up. The artery carries oxygenated blood away from the heart to the lower limb, while the vein returns deoxygenated blood back toward the heart. If a question asks about blood supply to the leg, look for the artery.

## Key Takeaways

- The popliteal artery is the major artery behind the knee, and it is a continuation of the femoral artery.
- It changes name at the adductor hiatus, which is the anatomical opening that lets the vessel move from the thigh into the popliteal region.
- This artery supplies oxygenated blood to the knee, lower leg, and foot through its downstream branches.
- Because it lies deep behind the knee, it is better for route tracing and diagram ID than for pulse checking at the surface.
- Knowing the popliteal artery helps you connect vessel naming, regional anatomy, and the full path of blood through the lower limb.

## FAQs

### What is the popliteal artery in Anatomy and Physiology I?

It is the main artery behind the knee, where the femoral artery continues after passing through the adductor hiatus. In A&P, you learn it as a major blood supply route to the lower leg and foot. It is a standard landmark in lower-limb circulation.

### Where is the popliteal artery located?

It is located deep in the back of the knee in the popliteal fossa. Because it sits behind the joint, it is protected by nearby muscles and tissues. That location also makes it a key landmark when tracing vessels through the lower limb.

### How is the popliteal artery related to the femoral artery?

The popliteal artery is the continuation of the femoral artery after it passes through the adductor hiatus. The vessel does not end, it just changes name when it enters a new region. This is a common A&P naming pattern for blood vessels.

### What does the popliteal artery supply?

It supplies oxygenated blood to the knee, lower leg, and foot. Its branches continue into the tibial arteries, which carry blood farther down the limb. If you are tracing circulation, think of it as a major junction before blood reaches the lower leg.

## Related Study Guides

- [20.5 Circulatory Pathways ](/anatomy-physiology/unit-20/5-circulatory-pathways/study-guide/nKkAS5lkN4RVf6Kk)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)

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