“Clit” is short for clitoris, the primary organ for sexual pleasure in female anatomy. It’s a complex structure made up of erectile tissue and nerves, with most of its size hidden inside the body. The small, visible portion is just the tip of a much larger network that extends internally around the vagina and urethra.
Basic Anatomy of the Clitoris
The clitoris is not a single button or bump. It’s a multiplanar structure with several connected parts: paired erectile bodies called crura (internal “legs” that extend back toward the pelvic bone), paired bulbs of erectile tissue that flank the vaginal opening, a shaft or body, and the glans, which is the small rounded part visible on the outside. The glans is the only external portion and sits at the top of the vulva, partially covered by a fold of skin called the clitoral hood.
The visible glans is quite small. In a non-aroused state, it averages about 5 millimeters long and 3.4 millimeters wide, roughly the size of a small pea. But the full internal structure is significantly larger, with the crura and bulbs extending several centimeters into the body. Together, these components form an erectile tissue cluster that partially surrounds the urethra and vaginal canal.
Why It Exists
The clitoris is the only organ in the human body whose sole known function is pleasure. Unlike the penis, which serves both reproductive and urinary roles, the clitoris exists specifically to enable sexual sensation and orgasm. It contains an extraordinary density of nerve fibers. A 2023 histological study found that roughly 10,280 myelinated nerve fibers innervate the glans clitoris, and the true total is likely higher when accounting for additional unmyelinated fibers. This makes it one of the most sensitive structures in the human body.
How It Relates to the Penis
The clitoris and penis develop from the same embryonic tissue, called the genital tubercle. In the early weeks of fetal development, the structure is identical regardless of sex. As development continues, hormonal signals direct it to form either a penis or a clitoris. Because of this shared origin, the two organs have parallel features: both contain spongy erectile tissue surrounded by a tough outer layer, both have a glans at the tip, and both share a similar nerve supply pattern. The key structural difference is that the urethra does not pass through the clitoris.
What Happens During Arousal
The clitoris becomes engorged with blood during sexual arousal, much like the penis does. The erectile tissue contains a meshwork of cavernous spaces lined with smooth muscle. When stimulated, these spaces fill with blood, causing the internal and external portions to swell. Muscles at the base of the clitoris contract reflexively during arousal, contributing to this engorgement.
There is an important difference from penile erection, though. The clitoris lacks a specific layer of tissue that traps blood under high pressure, so it doesn’t become rigid the way a penis does. Instead, it swells and becomes more sensitive. When engorged, the internal bulbs expand around the front wall of the vagina, which helps explain why stimulation of that area can feel pleasurable even though the external glans isn’t being directly touched.
Its Role in Orgasm
For decades, there was debate about whether “clitoral” and “vaginal” orgasms were fundamentally different experiences. MRI and ultrasound studies have largely resolved this. The internal portions of the clitoris, specifically the bulbs and crura, sit directly behind the front vaginal wall in the area sometimes called the G-spot. When that area is stimulated, the pressure reaches the clitoral tissue underneath. The front vaginal wall also has more nerve endings than the back wall, and those nerves feed into the same nerve bundle that serves the external glans.
So whether stimulation comes from the external glans, the front vaginal wall, or both, the clitoral nerve network is involved. Women can experience orgasm from stimulation of the external clitoris, the internal region, the cervix, or even non-genital areas like the nipples. The clitoris, urethra, and vagina form an interconnected tissue complex that shares blood supply and nerve pathways, functioning as a unified system during sexual response.
Common Health Concerns
The most common clitoral health issue is adhesions, where the hood of skin covering the glans partially or fully fuses to the glans itself. This can happen gradually and often goes unnoticed. Adhesions are classified by how much of the glans remains visible: mild means more than 75% is still exposed, moderate means 25% to 75%, and severe means less than 25%.
When adhesions form, the closed space between the hood and glans can become irritated or infected. Symptoms include a persistent feeling of irritation (sometimes described as a sensation similar to having sand in the eye), pain, unusual sensitivity, or discomfort during sexual activity. These adhesions are frequently overlooked during routine exams because the area isn’t always checked, but they’re treatable once identified.