---
title: "Posterior Tibial Artery | Anatomy and Physiology I"
description: "Posterior tibial artery is a major lower-leg artery that carries oxygenated blood to the ankle and sole, following the popliteal artery in Anatomy and Physiology I."
canonical: "https://fiveable.me/anatomy-physiology/key-terms/posterior-tibial-artery"
type: "key-term"
subject: "Anatomy and Physiology I"
unit: "Unit 20"
---

# Posterior Tibial Artery | Anatomy and Physiology I

## Definition

The posterior tibial artery is a major artery of the lower leg that carries oxygenated blood from the popliteal artery to the ankle and sole of the foot. In Anatomy and Physiology I, it is part of the circulatory pathways you trace through the lower limb.

## What It Is

The posterior tibial artery is the main artery that continues down the back of the lower leg after the popliteal artery splits. In Anatomy and Physiology I, you usually learn it as one of the major vessels that brings oxygenated blood into the foot and supports tissues in the ankle and sole.

It begins deep in the posterior compartment of the leg and travels with the structures behind the tibia. Because it stays on the back side of the lower leg, its name tells you both location and direction. The word posterior points to its position, and tibial points to its close relationship with the tibia, even though the vessel does not sit right on the bone’s surface.

This artery matters because the lower leg and foot need a steady blood supply for muscle activity, tissue repair, and nerve function. When you walk, stand, or shift weight, the muscles of the calf and foot still need oxygenated blood delivered through arteries like this one. The posterior tibial artery helps feed that supply chain to the tissues that do the work of movement and balance.

A common point of confusion is that many vessels in the leg sound similar. The posterior tibial artery is not the same as the anterior tibial artery, which runs down the front of the leg. That front-versus-back distinction is useful in lab work and diagrams, because the two arteries branch from the same general region but serve different pathways through the limb.

Near the ankle, the posterior tibial artery is a useful landmark because it can be found where it passes behind the medial malleolus before reaching the foot. In anatomy diagrams, that route helps you connect the vessel to the larger flow pattern from the heart, through the aorta, into the lower limb, and finally into the foot tissues.

## Why It Matters

The posterior tibial artery shows how the circulatory system is organized by region, not just by organ. In Anatomy and Physiology I, you are not only memorizing vessel names, you are tracing where oxygenated blood goes after it leaves the heart and how that blood reaches specific body parts.

This term also gives you a clean way to compare the front and back of the lower leg. If you can place the posterior tibial artery correctly on a diagram, you are already using anatomical direction terms, recognizing the lower limb’s vascular layout, and separating one artery from another that may sound similar.

It also connects directly to functional anatomy. The calf, ankle, and sole all need perfusion for standing, walking, and maintaining tissue health. If blood flow is reduced in a vessel serving the foot, the effects show up where students can picture them, such as cool skin, poor healing, or weakness during activity.

In the classroom, this term usually appears when you are tracing blood flow, labeling diagrams, or matching arteries to body regions. Knowing it keeps you from mixing up vessel names and helps you explain how circulation supports movement in the lower limb.

## Connections

### [Popliteal Artery](/anatomy-physiology/key-terms/popliteal-artery)

The posterior tibial artery branches from the popliteal artery, so the popliteal vessel is the upstream source in the lower limb. If you trace blood flow from the thigh into the knee region, the popliteal artery is the point where the route into the posterior leg begins. This connection is often tested with diagram labeling or flow-order questions.

### [Anterior Tibial Artery](/anatomy-physiology/key-terms/anterior-tibial-artery)

These two arteries are easy to mix up because they both serve the lower leg and both have tibial in the name. The posterior tibial artery runs down the back of the leg, while the anterior tibial artery travels down the front. Comparing them helps you use anatomical directions instead of memorizing names in isolation.

### Oxygenated Blood

The posterior tibial artery carries oxygenated blood to tissues in the lower leg and foot. That means it is part of the delivery side of circulation, bringing oxygen and nutrients to cells that need them for movement and repair. This makes the artery a good example of how arterial blood supports tissue function outside the heart and lungs.

### Circulatory System

This artery is one branch in the larger circulatory system, which moves blood through the body in a branching network. Understanding the posterior tibial artery helps you see that circulation is not just about the heart pumping, but about specific vessels delivering blood to exact regions. That regional pattern is a big theme in Anatomy and Physiology I.

## On the AP Exam

A lab practical may ask you to point to the posterior tibial artery on a leg model or identify it on a blood-flow diagram. A multiple-choice question might give you the popliteal artery and ask which vessel continues into the posterior lower leg, or it may ask what region this artery supplies. You may also see it in tracing questions where you follow oxygenated blood from the heart to the foot. When you answer, use the direction clue in the name, posterior, and link it to the lower leg and sole rather than the front of the shin.

## posterior tibial artery vs anterior tibial artery

These are the most common pair to mix up because both are lower-leg arteries with tibial in the name. The posterior tibial artery runs down the back of the leg and supplies the posterior lower leg, ankle, and sole of the foot. The anterior tibial artery runs down the front of the leg toward the dorsum of the foot, so direction is the fastest way to tell them apart.

## Key Takeaways

- The posterior tibial artery is a major artery of the lower leg that carries oxygenated blood toward the ankle and sole of the foot.
- It is a continuation of the popliteal artery, so it fits into the blood-flow pathway below the knee.
- The name tells you where it runs, on the posterior side of the leg near the tibia.
- It is easy to confuse with the anterior tibial artery, so the front-versus-back distinction matters.
- In Anatomy and Physiology I, you use this term when tracing circulation, labeling diagrams, and identifying lower-limb vessels.

## FAQs

### What is the posterior tibial artery in Anatomy and Physiology I?

It is a major artery that carries oxygenated blood down the back of the lower leg to the ankle and sole of the foot. It branches from the popliteal artery and is part of the lower-limb circulatory pathway you trace in A&P.

### Where is the posterior tibial artery located?

It runs deep in the posterior part of the lower leg, behind the tibia. Near the ankle, it passes behind the medial malleolus before continuing into the foot. That location is why its name is such a useful clue on diagrams.

### What does the posterior tibial artery supply?

It supplies oxygenated blood to the lower leg, ankle, and sole of the foot. In simple terms, it feeds tissues that need oxygen for movement, maintenance, and repair. That makes it a key vessel in lower-limb circulation.

### How is the posterior tibial artery different from the anterior tibial artery?

The posterior tibial artery travels down the back of the leg, while the anterior tibial artery runs down the front. They are both lower-leg arteries, but the direction word in the name tells you which side to place them on a diagram.

## Related Study Guides

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

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