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A stool test is a medical diagnostic technique that involves the collection and analysis of fecal matter. Microbial analysis (culturing), microscopy and chemical ...
This angle is called the anorectal angle. [41] When feces reach the rectum, the rectal walls become naturally distended, stimulating nerve receptors. Brain centres for defecation respond to this sensation and stimulate mass colonic movement in the colon and the rectum. [20] These mass contractions move feces along the colon and into the rectum ...
Rectal sensation is required to detect the presence, nature, and amount of rectal contents. [26] Reduced rectal sensation may be a contributory factor. If the sensory nerves are damaged, the detection of stool in the rectum is dulled or absent, and the person will not feel the need to defecate until too late.
Testing of stool samples by real-time polymerase chain reaction is able to detect C. difficile about 93% of the time and when positive is incorrectly positive about 3% of the time. [54] This is more accurate than cytotoxigenic culture or cell cytotoxicity assay. [54] Another benefit is that the result can be achieved within three hours. [54]
Damage to the defecation centre within the medulla oblongata of the brain can lead to bowel dysfunction. A stroke or acquired brain injury may lead to damage to this centre in the brain. Damage to the defecation centre can lead to a loss of coordination between rectal and anal contractions and also a loss of awareness of the need to defecate. [12]
A 2023 study published in the journal Acta Neuropathologica examined tissue from the brain and retina of 86 individuals and compared samples from donors with normal cognitive function to samples ...
Anatomic pathology relates to the processing, examination, and diagnosis of surgical specimens by a physician trained in pathological diagnosis. Clinical pathology involves the laboratory analysis of tissue samples and bodily fluids; procedures may include blood sample analysis, urinalysis, stool sample analysis, and analysis of spinal fluid ...
The latest research looked at a part of the brain called the olfactory bulb, which processes information about smell. Humans have two olfactory bulbs, one above each nasal cavity. Humans have two ...