What Are The Largest Arteries In The Body? | Artery Size Map

Guide / By

The aorta is the body’s biggest artery, followed by the pulmonary trunk and broad branches that feed the head, trunk, and legs.

If you want one name, it’s the aorta. It leaves the left ventricle, curves through the chest, then runs into the abdomen before splitting near the pelvis. No other artery matches it for width, wall strength, or the sheer volume of blood it carries with each heartbeat.

The plural part of this question matters too. After the aorta, a short list of other wide vessels sits near the top of the size chart. The pulmonary trunk is one. Then come large branch arteries such as the brachiocephalic trunk, common carotids, subclavians, common iliacs, and femorals. These are the big highways of circulation, and nearly every smaller artery comes off one of them sooner or later.

What Are The Largest Arteries In The Body By Region?

A clean way to sort them is by region. Near the heart, the aorta and pulmonary trunk are the widest. In the neck and upper chest, the brachiocephalic trunk, common carotid arteries, and subclavian arteries stand out. Lower down, the common iliac and femoral arteries are the heavy hitters that send blood into the pelvis and legs.

That layout helps because people often mix up “largest overall” with “largest branch in one area.” The aorta wins overall. The pulmonary trunk is among the widest vessels attached to the heart. In the limbs, the femoral artery is one of the biggest named arteries you can feel with your fingers.

The Aorta Sits At The Top

The aorta starts at the heart, right where oxygen-rich blood leaves the left ventricle. It rises as the ascending aorta, bends as the aortic arch, then continues as the descending thoracic aorta and the abdominal aorta. By the time it reaches the lower abdomen, it splits into the right and left common iliac arteries.

Its wide diameter isn’t some random quirk. The aorta has to take the full force of each beat, stretch a bit, and keep blood moving between beats. That elastic recoil is a big reason blood flow stays steady instead of pulsing in a jerky stop-start pattern.

The Pulmonary Trunk And Pulmonary Arteries Are Wide Too

People sometimes forget the pulmonary side because it carries oxygen-poor blood. It still counts. The pulmonary trunk leaves the right ventricle, then splits into the right and left pulmonary arteries on the way to the lungs. It is short, but it is broad, and it belongs near the top of any size-based list of the heart’s great vessels.

That can feel odd at first since arteries are often taught as vessels that carry oxygen-rich blood. The cleaner rule is this: arteries carry blood away from the heart, while veins bring it back. That’s why the pulmonary arteries are arteries even though their blood has not reached the lungs yet.

The Next Tier Includes The Neck, Arm, Pelvis, And Leg Arteries

Once blood leaves the aorta, the vessel tree narrows in stages. The first big branch on the right is the brachiocephalic trunk. It soon divides into the right common carotid and right subclavian arteries. On the left, the common carotid and subclavian usually branch straight from the aortic arch.

Farther down, the abdominal aorta gives rise to the common iliac arteries. Each common iliac splits again, and the external iliac continues into the thigh as the femoral artery. That’s why the femoral artery feels so strong at the groin: it is still a large, high-flow vessel at that point.

According to the NHLBI overview of blood flow through the heart, arteries carry blood away from the heart. The Cleveland Clinic’s aorta anatomy page describes the aorta as the main vessel that sends oxygen-rich blood to the body, while MedlinePlus’ carotid anatomy overview shows how the paired carotid arteries feed the head and brain.

Artery Usual Adult Diameter Main Destination
Ascending aorta About 25–35 mm Launch point for blood going to the whole body
Pulmonary trunk About 25–30 mm Blood going from the heart to the lungs
Brachiocephalic trunk About 10–15 mm Right head, neck, and arm
Common carotid artery About 6–8 mm Head and brain
Subclavian artery About 8–10 mm Upper chest and arm
Common iliac artery About 8–12 mm Pelvis and lower limb route
Femoral artery About 6–10 mm Thigh and lower leg route
Renal artery About 5–7 mm Kidneys

The numbers above are rough adult ranges, not fixed rules. Diameter changes with body size, sex, age, where the vessel is measured, and whether the reading came from ultrasound, CT, MRI, or direct anatomy lab work. So the exact order can shift a bit at the branch level, but the aorta stays at number one.

How The Big Arteries Branch From The Heart To The Legs

You can trace the widest arteries as a simple top-down chain. Once you see that chain, the naming starts to stick and the body map feels less crowded.

  • Left ventricle to aorta: the main outflow for oxygen-rich blood.
  • Aortic arch branches: brachiocephalic trunk, left common carotid, and left subclavian.
  • Abdominal split: the aorta ends as the right and left common iliac arteries.
  • Leg route: external iliac becomes the femoral artery after it passes under the inguinal ligament.

There’s also the lung route: right ventricle to pulmonary trunk to right and left pulmonary arteries. That branch set sits outside the body-wide aortic tree, yet it still belongs in any honest answer about the largest arteries.

Why The Largest Arteries Need Thick, Springy Walls

Big arteries do more than move blood from point A to point B. Their walls also absorb the pressure wave created by each heartbeat. The aorta is the star here, with elastic tissue that lets it stretch as blood is ejected, then recoil as the heart refills.

As the vessels branch and narrow, the job changes. Smaller muscular arteries can tighten or relax more actively to shift blood toward one region or another. The huge arteries near the heart are built for bulk flow and pulse buffering. The medium ones start to handle distribution.

Why One “Largest” List Can Look A Little Different

Some charts rank arteries by raw diameter. Others sort them by blood flow, teaching value, or how often they show up in anatomy class. That’s why you may see the pulmonary trunk placed above or beside the widest part of the aorta in some diagrams, while body-region lists spend more time on carotid, iliac, and femoral arteries.

For a plain-language answer, this version works well: the aorta is the largest artery overall, the pulmonary trunk is one of the next widest, and the common carotid, subclavian, common iliac, and femoral arteries are among the biggest named branches most people hear about after that.

Artery Group What Makes It Stand Out Common Place You Hear About It
Aorta Biggest diameter and full-body outflow Aneurysm screening, chest imaging
Pulmonary trunk Broad vessel tied to lung circulation Heart scans, pulmonary pressure workup
Common carotids Direct route to brain and face Stroke risk, neck ultrasound
Common iliacs Final big split of the abdominal aorta Pelvic imaging, aneurysm workup
Femoral arteries Large limb artery with a strong pulse point Catheter access, leg blood flow checks

Easy Ways To Remember The Largest Arteries

If lists slide right out of your head, use shape and location instead of rote memory.

  • Start with the trunk: one huge aorta leaves the heart and runs down the middle.
  • Then think paired branches: carotids in the neck, subclavians under the collarbone, iliacs in the pelvis.
  • Then think the leg handoff: iliac turns into femoral as it enters the thigh.
  • Keep the lung route separate: pulmonary trunk splits early and heads only to the lungs.

That mental map is usually enough to answer classroom questions, read scan reports with less guesswork, or make sense of why some pulse points are easy to feel and others are not.

Why Artery Size Comes Up In Real Life

Size becomes more than a trivia point when a scan mentions dilation, narrowing, plaque, or aneurysm. The aorta gets a lot of attention because even a small change in a very large artery can matter. Carotid arteries come up in stroke workups. Femoral arteries matter in catheter procedures and in leg circulation checks.

That said, “large” does not mean “most likely to cause trouble,” and one measurement on its own never tells the whole story. Doctors read size alongside age, body build, symptoms, blood pressure, and the exact segment being measured. A 3-centimeter number can mean one thing in a pulmonary vessel and a different thing in a carotid branch.

If you strip the anatomy down to one sentence, here it is: the aorta is the body’s largest artery, the pulmonary trunk sits close behind among the heart’s great vessels, and the carotid, subclavian, common iliac, and femoral arteries are the next big names worth knowing.

References & Sources

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