Anal sphincter muscles diagram
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The external anal sphincter EAS is made of striated muscle the same as the pelvic floor muscles . we do have voluntary control over the EAS — allowing us to hold on if we are aware of wind or diarrhoea. So, when the rectum fills, and the pressure inside it increases, the nerves sense the pressure and tell the brain about it. As the muscles relax, the anus opens and the rectum empties. Bowel constipation incontinence. The internal anal sphincter IAS is made of smooth muscle and we do not have voluntary control of this muscle. The colon, or large intestine also known as the large bowel , starts at the final portion of the small intestine and goes all the way to the rectum. The anal canal is about 3 — 4cm long in women and sometimes slightly longer in men.
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Influence Of Autonomic Nerves On The Internal Anal Sphincter In Man
One of the muscle groups within levator ani is the puborectalis. So, when the rectum fills, and the pressure inside it increases, the nerves sense the pressure and tell the brain about it. The rectum empties and stool is expelled. These different sections are separated by bands of muscles, or sphincters, which act as valves. The external anal sphincter EAS is made of striated muscle the same as the pelvic floor muscles . we do have voluntary control over the EAS — allowing us to hold on if we are aware of wind or diarrhoea. Muscular contractions squeeze peristalsis the food through the different sections of the intestine.
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After the first stitch
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