Biomaterial Database

The anal sphincter. 1984

M M Henry, and J P Thomson

The anal sphincter has not generally stimulated great scientific interest although anatomical and physiological disorders of this region are common and may be the cause of considerable suffering to the individual affected. Over the last decade there has, however, been an accelerating interest in the function of this important sphincter.

UI	MeSH Term	Description	Entries
D011312	Pressure	A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Pressures
D012002	Rectal Diseases	Pathological developments in the RECTUM region of the large intestine (INTESTINE, LARGE).	Anorectal Diseases,Anorectal Disorders,Rectal Disorders,Anorectal Disease,Anorectal Disorder,Rectal Disease,Rectal Disorder
D012005	Rectal Prolapse	Protrusion of the rectal mucous membrane through the anus. There are various degrees: incomplete with no displacement of the anal sphincter muscle; complete with displacement of the anal sphincter muscle; complete with no displacement of the anal sphincter muscle but with herniation of the bowel; and internal complete with rectosigmoid or upper rectum intussusception into the lower rectum.	Anus Prolapse,Anus Prolapses,Prolapse, Anus,Prolapse, Rectal,Prolapses, Anus,Prolapses, Rectal,Rectal Prolapses
D012018	Reflex	An involuntary movement or exercise of function in a part, excited in response to a stimulus applied to the periphery and transmitted to the brain or spinal cord.
D003672	Defecation	The normal process of elimination of fecal material from the RECTUM.	Bowel Function,Bowel Movement,Bowel Functions,Bowel Movements,Defecations
D005242	Fecal Incontinence	Failure of voluntary control of the anal sphincters, with involuntary passage of feces and flatus.	Bowel Incontinence,Fecal Soiling,Incontinence, Bowel,Incontinence, Fecal,Soilings, Fecal
D005401	Fissure in Ano	A painful linear tear at the margin of the anus. It appears as a crack or slit in the mucous membrane of the anus and is very painful and difficult to heal.	Anal Fissure,Anal Ulcer,Anal Ulcers,Fissure, Anal,Ulcer, Anal,Ulcers, Anal
D006484	Hemorrhoids	Swollen veins in the lower part of the RECTUM or ANUS. Hemorrhoids can be inside the anus (internal), under the skin around the anus (external), or protruding from inside to outside of the anus. People with hemorrhoids may or may not exhibit symptoms which include bleeding, itching, and pain.	Hemorrhoid
D006627	Hirschsprung Disease	Congenital MEGACOLON resulting from the absence of ganglion cells (aganglionosis) in a distal segment of the LARGE INTESTINE. The aganglionic segment is permanently contracted thus causing dilatation proximal to it. In most cases, the aganglionic segment is within the RECTUM and SIGMOID COLON.	Aganglionosis, Colonic,Colonic Aganglionosis,Megacolon, Congenital,Aganglionic Megacolon,Aganglionosis, Rectosigmoid Colon,Aganglionosis, Total Colonic,Congenital Intestinal Aganglionosis,Congenital Megacolon,Hirschsprung's Disease,Megacolon, Aganglionic,Rectosigmoid Aganglionosis,Total Colonic Aganglionosis,Aganglionosis, Rectosigmoid,Disease, Hirschsprung,Disease, Hirschsprung's,Hirschsprungs Disease,Rectosigmoid Colon Aganglionosis
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man