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Rectococcygeal muscle : ウィキペディア英語版 | Rectococcygeal muscle
The rectococcygeal muscles are two bands of smooth muscle tissue arising from the 2nd and 3rd coccygeal vertebrae, and passing downward and forward to blend with the rectal longitudinal smooth muscle fibers on the posterior wall of the anal canal.〔Wu Y, Dabhoiwala NF, Hagoort J, et al. ''3D Topography of the Young Adult Anal Sphincter Complex Reconstructed from Undeformed Serial Anatomical Sections.'' Souglakos J, ed. PLoS ONE. 2015;10(8):e0132226. doi:10.1371/journal.pone.0132226〕 ==Structure== The rectococcygeal muscles are composed of smooth muscle and run from the anterior surface of the 2nd and 3rd coccygeal vertebrae down the posterior wall of the rectum as a triangular shaped muscle before branching and inserting among the various muscles and fascial structures associated with the pelvic diaphragm and anal canal and collectively called longitudinal anal muscles.〔
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