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. Author manuscript; available in PMC: 2006 Jun 14.
Published in final edited form as: Obstet Gynecol. 2005 Dec;106(6):1259–1265. doi: 10.1097/01.AOG.0000189084.82449.fc

Fig. 1.

Fig. 1.

A. Inferior, left three-quarter view of model showing relationship of external anal sphincter complex to the bones and pelvic organs. B. Inferior, left three-quarter view of the external anal sphincter complex. External anal sphincter is in red; note the lateral wing portion of the external anal sphincter. Subcutaneous external anal sphincter is in orange. C. Posterior view of the external anal sphincter complex showing the circumferential nature of both the external anal sphincter and the subcutaneous external anal sphincter. U, urethra; B, bladder; V, vagina; LA, levator ani muscle; R, Rectum; EAS-M, main body of external anal sphincter; EAS-W, lateral wing portion of the external anal sphincter; SQ-EAS, subcutaneous external anal sphincter.