Cerebral activation during anal and rectal stimulation

M. Lotze, B. Wietek, N. Birbaumer, J. Ehrhardt, W. Grodd, P. Enck

Research output: Contribution to journalArticle

Abstract

While the rectum is innervated by visceral afferents, the anal canal is innervated by the somatosensory pudendal nerve. The representation of these two central domains of intestinal sensations in the human brain is largely unknown. Nonpainful pneumatic stimulation of the anal canal and the distal rectum using event-related functional magnetic resonance imaging (fMRI) was performed in eight healthy subjects. Subjective scaling of sensations revealed no differences in unpleasantness and pain during both stimuli. Both types of stimuli revealed fMRI activation in secondary somatosensory, insula, cingular gyrus, left inferior parietal, and right orbitofrontal cortex. Anal stimulation resulted in additional activation of primary sensory and motor cortex, supplementary motor area, and left cerebellum. We concluded that viscerorectal and somatosensory anal stimulation predominantly differ in their primary sensory activation and additional activation in motor areas. This motor response following aversive somatosensory stimuli may be caused by a reflexive avoidance reaction which is not observed after the more diffuse experienced visceral stimulation.

Original languageEnglish
Pages (from-to)1027-1034
Number of pages8
JournalNeuroImage
Volume14
Issue number5
DOIs
Publication statusPublished - 2001

Fingerprint

Motor Cortex
Anal Canal
Rectum
Visceral Afferents
Magnetic Resonance Imaging
Pudendal Nerve
Gyrus Cinguli
Prefrontal Cortex
Cerebellum
Healthy Volunteers
Pain
Brain

Keywords

  • Anal
  • FMRI
  • Rectal
  • Somatosensory
  • Visceral

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

Cite this

Lotze, M., Wietek, B., Birbaumer, N., Ehrhardt, J., Grodd, W., & Enck, P. (2001). Cerebral activation during anal and rectal stimulation. NeuroImage, 14(5), 1027-1034. https://doi.org/10.1006/nimg.2001.0901

Cerebral activation during anal and rectal stimulation. / Lotze, M.; Wietek, B.; Birbaumer, N.; Ehrhardt, J.; Grodd, W.; Enck, P.

In: NeuroImage, Vol. 14, No. 5, 2001, p. 1027-1034.

Research output: Contribution to journalArticle

Lotze, M, Wietek, B, Birbaumer, N, Ehrhardt, J, Grodd, W & Enck, P 2001, 'Cerebral activation during anal and rectal stimulation', NeuroImage, vol. 14, no. 5, pp. 1027-1034. https://doi.org/10.1006/nimg.2001.0901
Lotze M, Wietek B, Birbaumer N, Ehrhardt J, Grodd W, Enck P. Cerebral activation during anal and rectal stimulation. NeuroImage. 2001;14(5):1027-1034. https://doi.org/10.1006/nimg.2001.0901
Lotze, M. ; Wietek, B. ; Birbaumer, N. ; Ehrhardt, J. ; Grodd, W. ; Enck, P. / Cerebral activation during anal and rectal stimulation. In: NeuroImage. 2001 ; Vol. 14, No. 5. pp. 1027-1034.
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