what connects stimulated nipples to sensation in vagina

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Surprise finding in response to nipple stimulation

August five, 2011 / 5:11 PM / Livescience.com

For many women, nipples are erogenous zones. A new study may explain why: The awareness from the nipples travels to the same part of the brain as sensations from the vagina, clitoris and cervix.

The report, published online July 28 in the Journal of Sexual Medicine, is the outset to map the female genitals onto the sensory portion of the encephalon. Using functional magnetic resonance imaging (fMRI), researchers noted which encephalon areas get active when women touch various parts of their bodies. The genital-sensing encephalon areas in women roughly correspond to the aforementioned areas in men, only the nipple finding was a surprise, said written report researcher Barry Komisaruk, a psychologist at Rutgers Academy.

"My speculation is that this could be the ground for many women proverb that nipple stimulation is erotogenic, because it stimulates the same area every bit the genitals," Komisaruk told LiveScience.

Four major fretfulness bring signals from women's genitals to their brains, Komisaruk said. The pudendal nerve connects the clitoris, the pelvic nerve carries signals from the vagina, the hypogastric nerve connects with the cervix and uterus, and the vagus nervus travels from the neck and uterus without passing through the spinal cord (making information technology possible for some women to achieve orgasm fifty-fifty though they have had consummate spinal cord injuries).

Experimenters had mapped the male person genital senses onto an area of the brain chosen the medial paracentral lobule, which sits in the crevice betwixt the two brain hemispheres. (If you imagine wearing earmuffs, the medial paracentral lobule would be on the meridian of your head, right nether the ring of the earmuffs.) What was missing, Komisaruk said, was a written report tracing those four nerves to where in the brain they send their signals.

For their study the researchers recruited eleven salubrious, non-significant women ages 23 to 56. While within the brain scanner, each woman stimulated her clitoris, vagina, neck and nipple by tapping rhythmically with a finger or, in the case of the vagina and cervix, using a plastic dildo.

Nipple mystery

The resulting brain images showed a nexus of activation in the medial paracentral lobule, just as in men. Each area of the genitals showed up in its own spot within this brain region, Komisaruk said. [See the brain images ]

"Even though they're all clustered at that place similar a cluster of grapes, the response to each [genital expanse] is different," he said. "They overlap, but they're separable."

Nipple stimulation showed upwards in the area of the brain that receives chest sensations, but information technology also popped upwards alongside the genital sensations in the medial paracentral lobule, the researchers plant. There could exist ii reasons for this, Komisaruk said. One is indirect: Stimulating the nipples, as in breast-feeding, releases the hormone oxytocin. This hormone, which is also released during labor, triggers uterus contractions. Then information technology's possible, Komisaruk said, that nipple stimulation triggers uterine contractions, which then produce a sensation in the genital area of the brain.

However, preliminary information suggest that nipple nerves may directly link upwards with the brain, skipping the uterine middleman. A few men who have been studied show the same design of nipple stimulation activating genital brain regions, Komisaruk said. One of his graduate students is further testing the idea past studying the response of women who have had a hysterectomy, meaning their uterus has been removed.

The erotic brain

The women in the study (each of whom was paid $100 to participate) were not necessarily turned on by the self-stimulation in the fMRI scanner; fifty-fifty so, using a similar setup in an earlier study, Komisaruk and his colleagues were the starting time to locate the female orgasm in the brain.

That leaves the question of what makes a sensation erotic, Komisaruk said.

"Are there particular brain regions that have to be activated in order for genital stimulation to be converted from run-of-the-mill stimulation versus stimulation with an erotic quality?" he said. "That is the big question."

For the tape, while eroticism is a mystery, Komisaruk and his lab team establish that an orgasm involves a diversity of brain regions, including the hypothalamic paraventricular nucleus; amygdala; accumbens-bed nucleus of the stria terminalis-preoptic surface area; hippocampus; basal ganglia; cerebellum; the anterior cingulate, insular, parietal and frontal cortices; and the lower brainstem.

Komisaruk hopes his inquiry will help people who tin can't attain orgasm. More broadly, he wants to discover out if people can learn to control their brain activity directly, much as nosotros take for granted our power to move our fingers and toes.

"If nosotros tin can control a part of the brain that produces pleasurable sensation, what would that do in the case of, say, depression or anxiety or addiction or obesity?" Komisaruk said. "Nosotros really don't know what the limits are as far as what we tin can brand our brains do."

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