. Diseases of the rectum and anus: designed for students and practitioners of medicine. ani muscle. The anus may be thoroughly stretched in every directionwithout permanently impairing its functions. In health, theorifice is closed by the external sphincter; but, in cancer,stricture, extensive ulceration, and other grave diseases of therectum, this muscle may become worn out or destroyed, andthe anus becomes patulous, causing partial or complete in-continence. PERIRECTAL SPACES The rectum is surrounded by loose connective tissue andfascia, the latter derived principally from the pelvic fascia.
. Diseases of the rectum and anus: designed for students and practitioners of medicine. ani muscle. The anus may be thoroughly stretched in every directionwithout permanently impairing its functions. In health, theorifice is closed by the external sphincter; but, in cancer,stricture, extensive ulceration, and other grave diseases of therectum, this muscle may become worn out or destroyed, andthe anus becomes patulous, causing partial or complete in-continence. PERIRECTAL SPACES The rectum is surrounded by loose connective tissue andfascia, the latter derived principally from the pelvic the rectum and sacrum is a large space, devoid offat, called the retrorectal space, and between the rectum, semi-nal vesicles, and the recto-vesical fascia is another space ofconsiderable size called the prerectal space (Quenu). Wal-deyer, in speaking of the latter space, claims that it is isolatedlaterally from the retrorectal space by the junction of theparietal and pelvic fascia and above it is lost in the subperi-toneal tissue of the bladder. He does not believe that the. PLATE IV—LEVAT0RE8 ANI, SIDE VIEW, SHOWING THEIR RELATION TO THE RECTUM. A A, Levatores ani. B, Rectum. ANATOMY AND PHYSIOLOGY 19 lateral spaces, described by Quenu, are deserving of specialconsideration. He further says that the anal canal does notcome into relationship with any of these spaces. ISCHIO=RECTAL FOSS/E On either side of the lower end of the rectum, betweenit and the tuber is-chii, are two large spaces filled with fat,and which are called the ischio-rectal fosses. They are triangu-lar in shape, with the apices directed upward and the basestoward the skin. Their depth varies from one and a half inches( centimeters) in front to two inches ( centimeters) be-hind, and at their lowermost and broadest part they are a littlemore than an inch ( centimeters) in width. Internally thesespaces are in relation to the external and internal sphincters,coccygeus, and levator ani muscles;
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanusdis, bookyear1910
