Sensory Nerve Distribution in the Vulva

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Sometimes when people experience changes in sensation of the skin of the vulva and bottom, it is useful to know that different nerves (and therefore different nerve pathways) are responsible for sensation in different locations. The right of this map shows the usual sensory nerve distribution and the technical name of the nerves. (Because everyone is different, expect that these nerves follow slightly different locations in any individual.)
 
It's important to realize that the closer to the spine an injury or medical condition occurs, the more likely whole areas (grouping two or more nerves) will change in sensation. When this happens, a whole area (called a dermatome) related to the spinal cord region can change in sensation. The left of this map shows the usual dermatome nerve distribution and corresponding spinal cord location.
 
When a health care provider considers the difference between these two maps, they can begin to assess where a problem might be occuring, and investigate further from there.