. Cunningham's Text-book of anatomy. Anatomy. 1224 THE DIGESTIVE SYSTEM. a series of small sacculations. These, however, disappear, and the longitudinal fibres, although thicker in front and behind, form a continuous layer all round, as the rectum proper is approached. INTESTINUM RECTUM. Intestinum Rectum.—The rectum is the portion of the large bowel which intervenes between the pelvic colon above and the anal canal—the slit-like passage through which it conmiunicates with the exterior (Eig. 961). Unlike the portion of the bowel which immediately precedes it, the rectum has but a partial cover
. Cunningham's Text-book of anatomy. Anatomy. 1224 THE DIGESTIVE SYSTEM. a series of small sacculations. These, however, disappear, and the longitudinal fibres, although thicker in front and behind, form a continuous layer all round, as the rectum proper is approached. INTESTINUM RECTUM. Intestinum Rectum.—The rectum is the portion of the large bowel which intervenes between the pelvic colon above and the anal canal—the slit-like passage through which it conmiunicates with the exterior (Eig. 961). Unlike the portion of the bowel which immediately precedes it, the rectum has but a partial covering of peritoneum, and is entirely destitute of a mesentery; sacculations, too, which are so characteristic of the large intestine, cannot properly be said to be present. The rectum begins at the termination of the pelvic mesocolon, namely, about the Posterior superior spine Upper lateral inflexion Peritoneum (pararectal fossa)' Superior hemorrhoidal artery Rectum Sacro-tuberous ligament Ischio-rectal fossa. Anal canal. Hll Third sacral vertebra Fourth sacral vertebra (cut) Lower border of piriformis (cut) Superior hemorrhoidal artery Middle lateral inflexion Coccygeus Levator ani Ar—External sphincter Fig. 959.—The Eectum froji behind. The sacrum has been sawn across through the 4th sacral vertebra, and its inferior part removed with the coccyx. The posterior portions of the coccygei, levatores ani, and of the external sphincter have been cut. away. The " pinching in " of the lower end of the rectum by the medial edges of the levatores ani, resulting in the formation of the flattened anal canal, is suggested in the illustration, which has been made from a formalin-hardened male body, aged 30. The lateral inflexions of the rectum, corresponding to the plicse transversales recti, are also shown. level of the third sacral vertebra, and ends, where the bowel pierces the pelvic floor, opposite the inferior and posterior part of the prostate in the male, or at a po
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
