Definition

Anatomy of the Prostate Gland

Choose a preferred language


Facts about the prostate gland

The prostate gland is about the size of a walnut. It's located just below the bladder, and it surrounds the urethra. This is a tube that carries urine and semen out of the body. The prostate is partly muscular and partly glandular. It has tubes (ducts) that open into the prostatic part of the urethra. It's made up of 3 lobes: a middle lobe, left lobe, and right lobe.

Cross section of male pelvis showing reproductive organs.


Function of the prostate gland

As part of the male reproductive system, the prostate gland’s main job is to secrete a slightly alkaline fluid that forms part of the seminal fluid. This is the fluid that carries sperm. During an orgasm, the muscular glands of the prostate help to propel the prostate fluid, and sperm that was made in the testicles, into the urethra. The semen then leaves the body out of the tip of the penis during ejaculation.

Featured in

© 2000-2026 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
schedule icon

Schedule an Appointment

Find the right provider and schedule anytime.

View Providers
Related Articles
Read article
Urology
Transurethral Resection of the Prostate (TURP): Home Recovery

After transurethral resection of the prostate (TURP) surgery and a stay in the hospital, you'll go home to recover. Read this to learn about what to expect and how you can care for yourself at home.

Read article
Urology
Prostate Cancer: Introduction

Prostate cancer is the most common cancer in men in the U.S. (not counting skin cancer). It's mostly found in older men. And in most cases, it's found before it has spread to other parts of the body.

Read article
Urology
Adult Circumcision

Circumcision is a procedure to remove the foreskin, the loose fold of skin that covers the head of the penis. Read on to learn more about adult circumcision and how it's done.

Read article
Urology
Understanding Bladder Stones

Bladder stones are small deposits of crystals made from minerals and proteins that form in the urine. They may form when a small amount of urine stays in your bladder after urinating.