The clitoris is a sexual organ located where the inner lips of the vulva meet, near the front of the body. Most people picture it as the small, sensitive nub visible on the outside, but that external part is just the tip. The full structure extends several centimeters inside the body, with internal branches of erectile tissue that surround the vaginal canal. It is the most nerve-dense organ in the human body and exists primarily for sexual pleasure.
External and Internal Anatomy
The visible portion is called the glans. It’s small, averaging about 3.4 millimeters wide, and sits beneath a fold of skin called the clitoral hood. The hood is sometimes described as part of the inner labia, but anatomical research shows it’s actually a distinct structure that may or may not connect to the labia depending on the individual. The hood protects the glans, which is densely packed with nerve fibers and highly sensitive to touch.
Beneath the surface, the clitoris has a shaft (called the body) that extends upward and then splits into two legs, known as the crura, which stretch back along either side of the vaginal opening. There are also two bulbs of erectile tissue that flank the vaginal canal. When you add the glans, body, crura, and bulbs together, the total structure is significantly larger than what’s visible from the outside. Measurements of the external glans and body together average around 16 millimeters, but the internal crura and bulbs extend well beyond that.
All of these internal components are made of erectile tissue, similar in composition to the tissue found in a penis. The glans itself is the exception: it’s densely wired with nerves but doesn’t contain erectile tissue of its own.
How It Develops
The clitoris and the penis develop from the same structure in the embryo, called the genital tubercle. During the first weeks of fetal development, this tissue is identical regardless of sex. As development continues, the tubercle either forms a penis or a clitoris. The two organs share direct structural parallels: the glans clitoris corresponds to the glans of the penis, the paired erectile bodies inside the clitoris correspond to those in the penile shaft, and large bundles of nerves run along both organs in the same pattern, with the highest density on the top (dorsal) side. The key difference is that the urethra does not pass through the clitoris.
Nerve Supply and Sensitivity
You may have seen the claim that the clitoris contains 8,000 nerve endings. That number was long repeated without a real study behind it. In 2023, researchers actually counted the nerve fibers in the dorsal nerves of the clitoris for the first time. They found a mean of roughly 10,281 myelinated nerve fibers across both nerves, and when unmyelinated fibers and contributions from deeper nerve branches are factored in, the true count is well above the old 8,000 figure.
These nerve signals travel through the dorsal nerve of the clitoris, a branch of the pudendal nerve. This nerve carries touch and pressure sensations from the clitoral body and glans to the spinal cord and brain. It is a purely sensory nerve at that point, meaning its sole job is relaying physical sensation.
What Happens During Arousal
In its resting state, the smooth muscle inside the clitoris stays contracted, keeping the erectile tissue compact. When arousal begins, nerve signals and chemical messengers cause the smooth muscle in the clitoral arteries and internal tissue to relax. Blood flows into the spongy chambers of the erectile bodies, pressure builds inside them, and the tissue swells. This engorgement pushes the glans outward slightly, making it more prominent and more sensitive to stimulation.
The internal bulbs also engorge during arousal, adding pressure and fullness around the vaginal opening. This entire process mirrors what happens in penile erection, using the same basic mechanism of blood filling expandable tissue.
Its Role in Sexual Pleasure
The clitoris is the primary organ for female sexual pleasure and is pivotal to orgasm for most women. Some debate exists about whether vaginal stimulation can trigger orgasm independently, but given that the internal branches of the clitoris surround the vaginal canal, the distinction may be less clear-cut than it seems. Stimulation that feels “vaginal” may still involve the clitoral bulbs and crura pressing against the vaginal walls from the other side.
The organ’s importance is underscored by a grim reality: the practice of female genital cutting specifically targets the clitoris to suppress sexual response, which speaks to how central it is to sensation. Research does show, however, that some degree of sexual function can persist even after surgical procedures involving the clitoris, likely because the deeper internal structures may remain intact.
How Aging Affects the Clitoris
Like most tissues in the body, clitoral tissue changes with age. Studies comparing tissue samples from women aged 20 to 40 with those from women over 60 found a significant shift in composition. Collagen, which is stiff and fibrous, nearly doubled in volume (from about 24% to 46% of the tissue). Smooth muscle, the type that relaxes to allow blood flow during arousal, decreased. Elastic fibers also declined.
This matters because smooth muscle is what allows the erectile tissue to fill with blood efficiently. When it’s replaced by collagen, the tissue becomes less flexible and less responsive to arousal signals. Blood flow to the clitoris also tends to decrease after menopause as estrogen levels drop. Research has found that hormone replacement therapy can increase deep clitoral artery blood flow in postmenopausal women, which may help maintain sensitivity and arousal response.
Why It Was Overlooked for So Long
The full internal anatomy of the clitoris wasn’t thoroughly described in modern medical literature until the late 1990s and early 2000s, when Australian urologist Helen O’Connell published detailed dissection studies. Her work established that the bulbs of erectile tissue flanking the vagina are part of the clitoris, not separate structures, and that the organ as a whole is far larger and more complex than anatomy textbooks had shown for over a century. Before her research, many medical references either minimized the clitoris or depicted it inaccurately, a gap that reflected broader cultural discomfort with female sexual anatomy rather than any lack of available tissue to study.