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The external anal sphincter consists of

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The external anal sphincter measures about 8 to 10 cm in length, from its anterior to its posterior extremity, and is about 2. 5 cm opposite the anus, when defecation occurs the sphincter muscle retracts. An anal sphincter is a group of muscles at the end of the rectum that surrounds the anus and controls the release of stool, thereby maintaining continence. There are two sphincter muscles one is internal and one is external. The internal anal sphincter is controlled involuntarily while the external anal sphincter is controlled voluntarily true or false. Hormone produced by an enteroendocrine cell of the stomach called a g cell. The internal anal sphincter is involuntary and consists of smooth muscle. Alimentary canal and accessory organs make up the digestive system learn with flashcards, games,. The external anal sphincter consists of striated muscle that is controlled voluntarily by somatic motor neurons that exit the spinal cord at s2s4 and travel over the pudendal nerve. The internal anal sphincter makes the largest contribution to continence about 85 of the resting anal tone of 4080 mmhg comes from the internal anal sphincter. Anal sphincter sfingkter a circular muscle that constricts a passage or closes a natural orifice. When relaxed, a sphincter allows materials to pass through the opening. Four main sphincter muscles along the alimentary canal aid in digestion the cardiac sphincter , the pyloric sphincter , and two.   other articles where internal anal sphincter is discussed anal canal the internal sphincter is part of the inner surface of the canal it is composed of concentric layers of circular muscle tissue and is not under voluntary control. The external anal sphincter consists of striated muscle fibers. The muscle is encased by the perimysium, which has a whitish colour and a structure resembling fasciae. 3 cm high around the anal canal and can be contracted at will. The internal anal sphincter consists of smooth muscle and is innervated by the autonomic nervous system while the external anal sphincter consists of striated skeletal muscle and has somatic innervation. The internal anal sphincter consists of smooth muscle cells under involuntary control, whereas the external anal sphincter consists of voluntarily-controlled striated muscle cells.

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