. Cunningham's Text-book of anatomy. Anatomy. Anal valves Fig. 962. -The Interior of the Anal Canal and Lower Part of Rectum, Crescentic fold which joins Showing the columns rectales, and the anal valves between their lower the lower ends Of the two ends. The columns were more numerous in this specimen than columns. These little folds, which resemble in miniature the segments of the semilunar valves of the heart, are the anal valves. They project inwards and upwards, and behind each is found a little pocket-like sinus (sinus rectalis). Processus vermiformis Superior ha?morrhoidal vessels Root
. Cunningham's Text-book of anatomy. Anatomy. Anal valves Fig. 962. -The Interior of the Anal Canal and Lower Part of Rectum, Crescentic fold which joins Showing the columns rectales, and the anal valves between their lower the lower ends Of the two ends. The columns were more numerous in this specimen than columns. These little folds, which resemble in miniature the segments of the semilunar valves of the heart, are the anal valves. They project inwards and upwards, and behind each is found a little pocket-like sinus (sinus rectalis). Processus vermiformis Superior ha?morrhoidal vessels Root of pelvic mesocolon ^--Lower end of pelvic colon ;*_——Internal spermatic vessels Genito-femoral nerve External iliac vessels —Obturator nerve -Umbilical artery *- Obturator vessels —Ureter Umbilical artery. Pelvic plexus of nerves Obt. vessels and nerve Ureter Pelvic plexus of nerves an< hemorrhoidal veins Levator ani Anal canal xternal sphincter Fig. 963.—Dissection of the Rectum from the Front m a Specimen hardened by Formalin Injection. The front wall of the pelvis has been removed, and the bladder, prostate, and seminal vesicles taken away. These valves were first described by Morgagni. Recently the view has been advanced by Ball that they are the remains of the embryonic cloacal or anal membrane ; and he explains the production of " painful fissure of the anus " by the tearing down of one of them during defsecation by hardened masses of faeces. The epidermis is continued in a thin and modified form from the exterior up along the anal canal as far as the superior end of the columnae rectales ; and the view is pretty generally held that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cunningham, D. J. (Daniel John), 1850-1909; Robinson, Arthur, b. 1862, ed. New York, W. Wood
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
