Nihon Daicho Komonbyo Gakkai Zasshi

1) Take breakfast enough and do not be pressed for time after that.
2) Do not bear the urge for bowel movement.
3) Go to lavatory right away after feeling the urge.
4) Finish bowel movement as fast as possible.
5) Keep stool not so hard.
6) Shut the buttock strongly several times after bowel movement.
7) Do not rub with tissue too precisely. Wash away with warm water if it is possible.

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We performed histological studies on the conjoined longitudinal muscle and the muscle fibers of the anal subepitbelial layer of specimens collected from 22 human ranging from 7 months of fetal to 73 years of age.
In our studies these muscle and muscle fibers were compared mainly among age groups and regions.
1. Conjoined longitudinal muscle.
The muscle was classified into three types on the basis of the course of running; that is an externally bending, a straight running, and an internally bending type.
It was also divided into three types on the basis of the pattern of division; that is, a type with 2 or 3 branches, a type showing a fan-like and a type showing a broom-like ramification, respectively.
On the basis of these classification, all the specimens were examined with the following results. In the younger age groups and the posterior commisure regional group, specimens belonging to the externally bending type and the type with 2 or 3 branches were predominant.In the older age groups and the anterior commisure regional group, specimens belonging to the straight running group and the group showing a broom-like ramification were predominant.
2. Muscle fibers of the anal subepithelial layer.
The muscle fibers were originated chiefly from the medial side of the upper part of the internal anal sphincter muscle.
The muscle fibers could be classified into four types on the basis of morphology; that is, a rod-like, a triangular, a fusiform, and a linear type.
When all the specimens were analyzed by the age group, the linear type was predominant in the group less than 20 years of age, the triangular type in the group of twenties and thirties, the fusiform type in the group of forties and fifties, and the linear type in the group of sixties.
There was no significant difference in the frequency of occurrence among the regional groups of specimens.

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