The vulva, which is the external genital area between a woman’s legs, has three separate openings: the urethral opening, the vaginal opening, and the anus. Each serves a completely different function, and they are arranged in a line from front to back.
Many people use “vagina” to refer to the entire area, but the vagina is actually just one of several structures within the vulva. Understanding which opening is which, where each one is located, and what it does can clear up a lot of confusion about basic anatomy.
The Three Openings and Their Functions
Starting from the front and moving toward the back, the three openings are arranged in this order:
- Urethral opening: A small opening located below the clitoris and just in front of the vaginal opening. Its only job is to release urine from the bladder. In women, the urethra is much shorter than in men, which is one reason urinary tract infections are more common in women.
- Vaginal opening: Also called the introitus, this sits below the urethral opening. It serves multiple purposes: menstrual blood exits through it, penetrative sex involves it, and it acts as the birth canal during childbirth. The vagina itself is a flexible, muscular canal that extends inward from this opening to the cervix.
- Anus: The rearmost opening, separated from the vaginal opening by a small patch of skin called the perineum. The anus is part of the digestive system and is surrounded by a sphincter muscle that controls bowel movements.
The urethral opening is easy to miss because it’s quite small. Some people assume urine exits through the vagina, but these are two entirely separate openings with separate internal pathways.
Vulva vs. Vagina: Why the Terms Matter
The word “vagina” is commonly used as a catch-all for everything in the genital area, but it technically refers only to the internal canal. The vulva is the correct term for the entire external region, which includes the inner and outer labia, the clitoris, the urethral opening, and the vaginal opening.
This distinction matters beyond vocabulary. If you’re trying to describe a symptom, locate discomfort, or understand your own body, knowing the difference between the vulva and the vagina helps you communicate more clearly. A burning sensation near the urethral opening, for example, points to a very different issue than pain inside the vaginal canal.
Why the Openings Are So Close Together
The perineum, the small strip of tissue between the vaginal opening and the anus, is only a few centimeters long. This close spacing is relevant to hygiene. Bacteria from the anus can travel forward to the urethral opening relatively easily, which is the primary reason the standard advice is to wipe from front to back after using the bathroom. This simple habit reduces the risk of urinary tract infections significantly.
The proximity of these openings also means that irritation, infection, or injury in one area can sometimes cause discomfort that feels like it’s coming from a neighboring structure. Soreness in the perineum after childbirth, for instance, can affect comfort around both the vaginal and anal openings.
How the Vaginal Opening Can Vary
The vaginal opening isn’t identical from person to person. A thin membrane called the hymen partially covers the opening, and its shape varies naturally. Some hymens have a single central opening, others have a band of tissue across the middle (called a septate hymen), and some have multiple tiny perforations instead of one larger opening.
In rare cases, the hymen completely covers the vaginal opening. This is called an imperforate hymen, and it typically becomes noticeable at puberty when menstrual blood cannot exit. The buildup of blood behind the membrane can create a visible bulge with a bluish tint. A septate or microperforate hymen may not cause an obvious blockage but can make inserting a tampon difficult or uncomfortable. These variations are typically straightforward to treat.
None of these variations change the number of openings. The urethral opening, vaginal opening, and anus are always separate structures, even when the vaginal opening looks different from person to person due to hymen shape.