肛门外括约肌皮下部
Pars subcutanea sphincteris externi ani
- 相关用语: 皮下部分
定义
肛门外括约肌皮下部是肛门外括约肌最远端的部分，位于肛门内括约肌的下方。它是唯一一块在肛门（肛门口）处环绕于肛门内括约肌下方的肌肉，负责维持肛门自制功能，在肛门开口处形成严密封闭。
肛门外括约肌皮下部在轴位平面上呈两条平行的肌肉束，在某些解剖学描述中呈J形，突显其独特的形态构型及其与肛门内括约肌下缘的整合关系。
參考資料
Correlation Between Gross Anatomical Topography, Sectional Sheet Plastination, Microscopic Anatomy and Endoanal Sonography of the Anal Sphincter Complex in Human Males.Al-Ali S, Blyth P, Beatty S, et al.Journal of Anatomy. 2009;215(2):212-20. doi:10.1111/j.1469-7580.2009.01091.
Cross-Sectional Imaging Anatomy of the Anal Sphincters.Peschers UM, DeLancey JO, Fritsch H, Quint LE, Prince MR.Obstetrics and Gynecology. 1997;90(5):839-44. doi:10.1016/S0029-7844(97)00406-7.
Magnetic Resonance Imaging and 3-Dimensional Analysis of External Anal Sphincter Anatomy.Hsu Y, Fenner DE, Weadock WJ, DeLancey JO.Obstetrics and Gynecology. 2005;106(6):1259-65. doi:10.1097/01.AOG.0000189084.82449.fc.
A Missing Distal Complex of the External and Internal Anal Sphincters: A Macroscopic and Histologic Study Using Japanese and German Elderly Cadavers.Ishiyama G, Kim JH, Chai OH, et al.Surgical and Radiologic Anatomy : SRA. 2021;43(5):775-784. doi:10.1007/s00276-020-02606-4.
