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UMN/LMN BOWEL

Neurosurgery

UMN/LMN BOWEL

1. UMN bowel - injuries above T12 (conus medullaris). Anal sphincter becomes spastic, voluntary control is lost but reflex activity is intact. Spastic anal sphincter contributes to constipation.
2. LMN bowel - injuries below T12 (conus medullaris). Anal sphincter becomes flaccid, voluntary and reflex control are lost. Absence of peristalsis after colonic, sigmoid and rectal denervation.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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