Brain activation during vaginocervical self-stimulation and orgasm in women with complete spinal cord injury

fMRI evidence of mediation by the Vagus nerves

Barry R. Komisaruk, Beverly Whipple, Audrita Crawford, Wen Ching Liu, Andrew Kalnin, Kristine Mosier

Research output: Contribution to journalArticle

183 Citations (Scopus)

Abstract

Women diagnosed with complete spinal cord injury (SCI) at T10 or above report vaginal-cervical perceptual awareness. To test whether the Vagus nerves, which bypass the spinal cord, provide the afferent pathway for this response, we hypothesized that the Nucleus Tractus Solitarii (NTS) region of the medulla oblongata, to which the Vagus nerves project, is activated by vaginal-cervical self-stimulation (CSS) in such women, as visualized by functional magnetic resonance imaging (fMRI). Regional blood oxygen level-dependent (BOLD) signal intensity was imaged during CSS and other motor and sensory procedures, using statistical parametric mapping (SPM) analysis with head motion artifact correction. Physiatric examination and MRI established the location and extent of spinal cord injury. In order to demarcate the NTS, a gustatory stimulus and hand movement were used to activate the superior region of the NTS and the Nucleus Cuneatus adjacent to the inferior region of the NTS, respectively. Each of four women with interruption, or "complete" injury, of the spinal cord (ASIA criteria), and one woman with significant, but "incomplete" SCI, all at or above T10, showed activation of the inferior region of the NTS during CSS. Each woman showed analgesia, measured at the fingers, during CSS, confirming previous findings. Three women experienced orgasm during the CSS. The brain regions that showed activation during the orgasms included hypothalamic paraventricular nucleus, medial amygdala, anterior cingulate, frontal, parietal, and insular cortices, and cerebellum. We conclude that the Vagus nerves provide a spinal cord-bypass pathway for vaginal-cervical sensibility in women with complete spinal cord injury above the level of entry into spinal cord of the known genitospinal nerves.

Original languageEnglish (US)
Pages (from-to)77-88
Number of pages12
JournalBrain Research
Volume1024
Issue number1-2
DOIs
StatePublished - Oct 22 2004
Externally publishedYes

Fingerprint

Self Stimulation
Orgasm
Vagus Nerve
Spinal Cord Injuries
Solitary Nucleus
Magnetic Resonance Imaging
Brain
Spinal Cord
Afferent Pathways
Physical and Rehabilitation Medicine
Medulla Oblongata
Parietal Lobe
Paraventricular Hypothalamic Nucleus
Gyrus Cinguli
Frontal Lobe
Cerebral Cortex
Artifacts
Analgesia
Cerebellum
Fingers

Keywords

  • Analgesia
  • Cervix
  • Human
  • Paraventricular nucleus of hypothalamus
  • Solitary nucleus
  • Vagina

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Brain activation during vaginocervical self-stimulation and orgasm in women with complete spinal cord injury : fMRI evidence of mediation by the Vagus nerves. / Komisaruk, Barry R.; Whipple, Beverly; Crawford, Audrita; Liu, Wen Ching; Kalnin, Andrew; Mosier, Kristine.

In: Brain Research, Vol. 1024, No. 1-2, 22.10.2004, p. 77-88.

Research output: Contribution to journalArticle

Komisaruk, Barry R. ; Whipple, Beverly ; Crawford, Audrita ; Liu, Wen Ching ; Kalnin, Andrew ; Mosier, Kristine. / Brain activation during vaginocervical self-stimulation and orgasm in women with complete spinal cord injury : fMRI evidence of mediation by the Vagus nerves. In: Brain Research. 2004 ; Vol. 1024, No. 1-2. pp. 77-88.
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