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A Defecation Reflex Center is located in the: A. Hypothalamus B. Spinal Cord C. Limbic System...

A Defecation Reflex Center is located in the:

A. Hypothalamus

B. Spinal Cord

C. Limbic System

D. Midbrain

E. Basal (Ganglia) Nuclei

F. Primary Motor Area

Science   Anatomy-And-Physiology   
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Answer #1

The answer os option B.Spinal cord

The defecation reflex centre is located at the sacral area of the spinal cord (s2-S4)

The parasympathetic defecation reflex is stimulated by the distension of the rectum. The stretch receptors of the rectal wall detects it and sends the impulses via the sensory fibres terminating at the reflex centres at S2-S4.The motor impulses reach the smooth muscles and causes a strong peristaltic wave and initiates the movement of faecus down and the internal anal sphicter is relaxed.

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