![The Encyclopædia britannica; a dictionary of arts, sciences, literature and general information. est is usually on the right side. Theyare known as the plicae recti or valves of Houston. In the The Encyclopædia britannica; a dictionary of arts, sciences, literature and general information. est is usually on the right side. Theyare known as the plicae recti or valves of Houston. In the](https://c8.alamy.com/comp/2CEPD43/the-encyclopdia-britannica-a-dictionary-of-arts-sciences-literature-and-general-information-est-is-usually-on-the-right-side-theyare-known-as-the-plicae-recti-or-valves-of-houston-in-the-analcanal-are-four-or-five-longitudinal-folds-called-the-columns-ofmorgagni-for-further-details-see-quains-anatomy-london1806-grays-anatomylondon-1905-cunninghams-anatomyedinburgh-1906-embryologythe-greater-part-of-the-alimentary-canal-isformed-by-the-closing-in-of-the-entoderm-to-make-a-longitudinaltube-ventral-and-parallel-to-the-notochord-this-tube-is-blindin-front-and-behind-c-2CEPD43.jpg)
The Encyclopædia britannica; a dictionary of arts, sciences, literature and general information. est is usually on the right side. Theyare known as the plicae recti or valves of Houston. In the
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