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The Clitoris: A Field Guide to the Bit Nobody Taught You
The Science of You
9 min read
The most important organ for female pleasure was left out of medical textbooks until 2005.
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If you were taught anatomy in school, you were almost certainly shown an incomplete picture. The clitoris was typically described as a small external nub - a minor feature at the top of the vulva. The reality, established through detailed MRI and dissection work in the late 1990s, is that the clitoris is a substantial internal organ spanning roughly 9 to 11 centimetres, with erectile tissue that wraps around the vaginal opening and extends deep into the pelvis. Understanding the actual anatomy changes how you understand arousal, orgasm, and why certain kinds of stimulation work the way they do.
The visible part of the clitoris - the part that most diagrams show - is the glans, a small rounded structure that sits beneath a fold of skin called the prepuce, or clitoral hood. The hood is formed by the junction of the two inner labia (labia minora) at the top of the vulva and serves to protect the glans from direct friction when unstimulated.
The glans itself varies considerably between individuals in terms of size, prominence, and how much of it protrudes beyond the hood. Some people have a glans that is clearly visible; in others it sits almost entirely beneath the prepuce. Neither is more or less sensitive - the variation in external anatomy does not predict sensitivity in any straightforward way. The glans is continuous with the shaft, or body, of the clitoris, which runs upward beneath the pubic mound before dividing internally into the two branches of the crura.
During arousal, the glans and shaft fill with blood and become engorged, much as the penis does. The clitoris can increase noticeably in size when aroused, though again the degree varies widely between individuals. The hood may partially retract as the glans swells.
The work that properly mapped the internal clitoris was published by urological surgeon Helen O'Connell and colleagues in 1998, based on detailed dissection and MRI imaging. Their findings established that the clitoris is a paired structure with three main internal components beyond the external glans and shaft.
The crura (singular: crus) are two elongated legs of erectile tissue that diverge from the body of the clitoris at an angle, extending backward and outward along the pubic rami - the bony arches that form the base of the pelvis. Each crus is several centimetres long. They are anchored to the periosteum of the pubic rami by fibrous tissue and fill with blood during arousal, becoming firm beneath the skin of the inner thigh and perineum.
The vestibular bulbs are two masses of erectile tissue that flank the vaginal opening, lying on either side of it beneath the labia minora. O'Connell's dissection work confirmed that these bulbs are part of the clitoral complex rather than distinct structures - they are connected to the body of the clitoris and share the same blood supply and nerve pathways. During arousal, the vestibular bulbs engorge and press against the walls of the vaginal opening, causing the characteristic swelling of the labia minora and narrowing of the vaginal entrance that occurs with sexual arousal.
Together, the body, crura, and vestibular bulbs form an internal organ that surrounds three sides of the vaginal opening. O'Connell's MRI measurements showed the total internal extent - from the tip of one crus to the other, following the structure - to be approximately 9 to 11 centimetres in most individuals. This figure surprised the medical community at the time, not because the anatomy was new, but because it had been systematically ignored.
The clitoris is supplied primarily by the pudendal nerve, which branches from the sacral plexus (nerve roots S2-S4). The terminal branch most relevant to clitoral sensation is the dorsal nerve of the clitoris, which runs along the dorsal (upper) surface of the clitoral body and into the glans.
The nerve density of the clitoral glans is exceptional. Research has estimated the glans to contain around 8,000 sensory nerve endings - more than any other structure of comparable size in the human body, and roughly double the count found in the glans penis. A 2022 study by Blair et al. using immunofluorescence to map nerve fibres in human clitoral tissue confirmed the extraordinary density and variety of mechanoreceptors present, adding histological detail to what had previously been estimated from functional and comparative anatomy.
This nerve density has a direct practical consequence: the glans is exquisitely sensitive to touch, but that same sensitivity means that direct, firm stimulation of the glans - particularly when unaroused - can feel uncomfortable or even painful rather than pleasurable. The hood serves a protective function for good reason. As arousal increases and the glans engorges, tolerance for more direct contact typically increases as well, but the most effective stimulation for many people involves the clitoral hood, the area around the glans, or indirect pressure rather than sustained direct contact with the glans itself.
O'Connell's 1998 paper was not the discovery of a new structure. The vestibular bulbs and clitoral crura had been described in anatomical literature for centuries. What her work did was establish, using modern imaging, that these structures are unified components of a single organ and that their connection to the clitoris had been consistently misrepresented or omitted in standard anatomical references.
Gray's Anatomy - the canonical reference for medical education - did not include an accurate depiction of the full clitoral structure until its 2005 edition. For the entirety of the preceding century, medical students were taught a truncated anatomy that focused almost entirely on reproductive function, leaving the structures most relevant to female sexual pleasure poorly described or absent.
Researchers like Puppo, writing in the European Journal of Obstetrics and Gynecology in 2013, have argued that the incomplete teaching of clitoral anatomy has had real clinical consequences - including inadequate surgical care during procedures such as female genital cosmetic surgery, and a persistent cultural narrative that female orgasm is more mysterious or complicated than male orgasm. The anatomy itself is not complicated. It was simply not taught.
Understanding the full clitoral structure explains several things that are otherwise puzzling if you only know the external anatomy.
First, it explains why many people with a clitoris do not reach orgasm through penetrative intercourse alone. The glans - the most densely innervated part - sits externally and receives little or no direct stimulation during most penetrative sex positions. The internal bulbs and crura are stimulated by pressure on the vaginal walls, and for some people this is sufficient, but the nature of that stimulation is indirect, diffuse, and less reliably intense than stimulation of the external glans. Research from Komisaruk and colleagues at Rutgers, using fMRI to map genital sensory cortex activation, has confirmed that the vaginal walls and clitoral structures produce overlapping but distinct patterns of brain activation - consistent with the idea that different kinds of stimulation engage the clitoral complex via different pathways.
Second, it explains the sensitivity of the anterior vaginal wall. The crura and vestibular bulbs lie close to the anterior (front) wall of the vagina, which means that pressure on this area - the region often discussed in relation to the G-spot - involves indirect stimulation of clitoral tissue. The anterior wall is not a separate erogenous zone with its own independent nerve supply; it is sensitive in part because of its proximity to the clitoral complex.
Third, it gives a practical frame for thinking about what kinds of stimulation to explore. If direct glans contact is uncomfortable or too intense, stimulation through the hood or the surrounding tissue engages the same nerve-dense structure with less concentrated pressure. The Velvet Rituals Aurora, designed with a broad surface and variable intensity, is suited to this kind of indirect stimulation around and over the glans rather than sustained pinpoint contact - which matches what the anatomy actually calls for.
The clitoris is not a small, peripheral feature of female anatomy. It is a substantial bilateral organ, richly innervated, with erectile tissue that responds to arousal across a wide internal area. The fact that most people were never taught this is a historical artefact, not a reflection of what the science says. The anatomy has been there all along.