The Anus Rectum and Prostate

The gastrointestinal tract terminates in a short segment, the anal canal. Its external margin is poorly demarcated, but the skin of the anal canal can usually be distinguished from the surrounding perianal skin by its moist, hairless appearance. The anal canal is normally held in a closed position by the muscle action of the voluntary external anal sphincter and involuntary internal anal sphincter, the latter an extension of the muscular coat of the rectal wall.

The direction of the anal canal on a line roughly between anus and umbilicus should be noted carefully. Unlike the rectum above it, the canal is liberally supplied by somatic sensory nerves, and a poorly directed finger or instrument will produce pain.

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100 Pregnancy Tips

100 Pregnancy Tips

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