CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '91363ff97dd19fd4',cH: 'kRcwmvcS.zERugIP0EESCLVu1M2jlvQuhE4lCnoihDY-1739800262-1.2.1.1-zFGL4rBc9rpt3gVxHqc.NiuRj7R8NlYRZ4OFkiR3B8u_y6O9h4Yuf436vaFOdAKR',cUPMDTk: "\/abstracts\/search?q=external%20anal%20sphincter%20muscle&__cf_chl_tk=XGUQIYift50ah70F1kKGKtMNpGPIq1_unBijOTeIT04-1739800262-1.0.1.1-JgRDkP1oyn9rpli8vHczFN.svJfrNPHiDQLXk9pYiOo",cFPWv: 'b',cITimeS: '1739800262',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=external%20anal%20sphincter%20muscle&__cf_chl_f_tk=XGUQIYift50ah70F1kKGKtMNpGPIq1_unBijOTeIT04-1739800262-1.0.1.1-JgRDkP1oyn9rpli8vHczFN.svJfrNPHiDQLXk9pYiOo",md: "FCYF40RGO_2AsWBwYKMnp24j_HEFezaK8lmK23AT988-1739800262-1.2.1.1-.r8qi.cU.eYh1ChQXmQum6lCbUd3hCAiDWkMSY26aLsrlPX2UiAsy49Y41sy2uEHvUWTXpP02uV6bnh7PDFVsM1pC__6YNKZ2H3hPGD_bLTqUxRn1.HJ2jcB6qrIAVu1TtdDknJQiqJX.IWIp0GmTkca_uv0OjSDim2JIxZsD3DBjEdShpWg_mEk.7mKZZzx8oMP.4FkLasrFqDlcKUBa1m.Y5F0m_HzzjKIo8.l8EC6jkOt46QLoe6oO1i1PUqRv3j_d.UF9LZEXj9zjUjKA7SRAQVVnNHG61V9MsmpTOq4E7CY_JfwLCR0nYGhBHO8LvPvhSSY3l7CIllJ8aC6S9MZrci__eIri4LMI4DIK7FNSrJPuiZZEiQlDEIosCpwsKP8ZNG0vbpJEwcvdvajaflxPI_.Uhfr_A7mLIWUAbbQFLpIVi7TQAsV0ntyfvYM2V1vBXIXgf.iK80jTa8S6cgVMnCbVUEsJqsae2C_2DQPFAVhwWZ4RArhegwWlU7wqnYSnXFCodPIQ1Xl4z_ODgMRWLmB3_lQxSo1GzxrSV7khp3aImo8F_O4ka7KCnmGx3F9YZ9t_w7RyZaMBeT03Q2wxqcxXB1dipEd.jxNyAAPmTfq6Fj8BsIVNxvl31YSVIpbdm6lA5IVPq24Dr0Tr0XZL_jiOHP5yh30nv.zrFhdOXAFvsi8Vg7Xzh5EM0l1L6jmlCkMJAt.yAM4xAQfwtr1CU.wryqC9CSR7FGanp7PbKMNBSmakd_38bbjWr5Egx3EGe.t84bGxLf0.LPZdmwKFDJltSq2LNmf5OcjidTD.27yLovmrS2PL7JKpltq.oA.pc8xHOqIpGhnmSHm5cpZh9.7edlv9fUjKdTlVdGGtMIwoscrwKpvZfmj77hl9xQc6zDH7HullIXriz_l1lz7_og5gOZqDUHKt7pDp9yCvgaIec6P_xsmvAhbGzjzSe.r0vRjK6GFfKf2OpsvDqDxkkdVU.pR0wA8yVzTMnfWhyXSlkDvwWKoCnKBZIRG45zGlLe4nl49BLDvhU9q9or_l9qs17zjDnmXfaAhAYrnA9oiiZa1K3snyT.7ko82AmK8R11q1j3p0eNYFnxNVsS.de.XuBDewi3frNp9hDgQNGf6G0H8c0YigBOwjGEucrGQ9dsgEcfOAyyvykEmRP9.umZJ3EzGY1rSoPqzoqk7EqE8LDn3kMtf0hJTbWN500IhxoxayWTHLsj0fzpRrl8X88rCbop2UmghPex5GcDMjYxxBsQrTH2N8es.yjgtnpp_rKj0A9nFOU1DtoTisjMNEvxUddip41FcR6ppO6LCveG.PvCV6mfqmgLsV6BxwJbnXLwvfosLo3hHDCDrYGQnoSIAsm.Si9Fm2vC18wJA5808QlwozguFyQ1I0StQ.AYXN_U_lUM63ux5AuTJlsJ78EBMnFLXgnE3FXeYuTWD7Ln.BiIr5m5uO3aAMg8.GiPZk8if5yO4aIP94EKOZ2VpLPzf69Ao.JebJCvBSWo7oaZSdE3IKrjcl8MI01uEAHkeMu8tVbdkRpMXVBReDIuymmxxSALXy4zkytmh9xQkVC347EOMFuLGMqfvkTxQVvOHkmCMEYQOtXIbjTYwJiTKnsJHULKbajXQicm79BExMIKntyqV1DWQm.utso_5Nc5lrSuZgQhzygQqZNCQNWR70kS6Wh43j3VrWV8vfClenUKFeiEQwiTdpN8hFjZGOO98WdhVpch3chsE8ZLGSFx_bo6m_GXGrGzXKs2QrLl3PEi9oeaqZfPF6y_JM88xuLY6Kk6Bk1ZS5b48g5ctjKg9_5x7jFfkxTMtu0JF7IaSpWMQuOdPtAUWdQakYFclpXu20rphlEvHdgWhXVRuOVp8Suj6flGgJxlb.Pi9cCEy3tqNhSKPwRpM0Xa.hEwNqVHKNP5RD0lhg.Nd01eyJ69BNLmnIYHnkx0zj41qVAqzqQ8dTCmYyNZ_1LHmBFIohJG3_j.KCUfQCBhulFSiFA",mdrd: "hfj_4uxdzC9gIs3mLaq1017_q_W_FDJlMaIdyvqEKd4-1739800262-1.2.1.1-tv52U7CDe8ZsVdM.p6W_yhfB4ovqWy3SYSYNrWNR2PS2Szfr4_JBL4ZdhjWDvZBBOKt7AKHXaUwddPg5XNQsMyOu2_3wSoTOva1pAeYTTpsnH36K7p4MEJz3Z.ixVcIToH7vJhxRZ9lvGArN93RIhkeiOXTw5K5Lso.AUuK0JvJbBEV8Q.npKsJXLKlGnwOZhMNunfusi2ckubYXqrTtxyR55I_XZsXfoiCS7ijIYnvtxvqmswhwyfTlCjFbLrAtEzK3Y2rHjFibZeMej0Ed5EkR.WvPJMcMc8GL2C96J4TeZ5h06BuAQBlnvWhg8yYtnEoSIRAl.ERMa3nhtanL4moEdlqJC6Y1_f_XD6QSqft3gKdEkkg2iXUKhqoNdp7nSijMonfUPMsg25mhrFX.KCPKcBmSL2cLIYYjn497B6.K589nhmUuLOvZNM6yM9qAGvQ.TBtV_bDmWZMykdMjFjsbvLa6RtAlXIeuayP1a5hRD629lo471t4i9S25geWDJm3xKTDybVahbxfNUgIZ3UJpZ9gMQKlloNUAM_B8Dn7iT35_IJfWArp7DEGVt8lrXlTrw9H8WMBg6wrskwKjl60qZbnx7RH4ZkMFhxYvigmAT56ySUhysZMzgFVl9gL5b._Mj6q2ZL8j1NHi.5W.yS5cxXseH_7J3yzJPOp.3YaVRZ27zWp1anUuEHi7vl.Gl1vRsGj48VwNt2kfX_I4cqVe.AGmu2cdqaDNZLvlo5bpnC_3ty5a2PtXXaPZWQk9vRbn8wOkwPp5l.Ft24DvjMVaoIa9ggze0KQnsuvybfEM3ReGzwio9c8IILSCXi7GM0wxqg09Js3D5lBZlXl2OhcH.tPnbO5J8Qwozww0foyeTgdowUsqd.qhIheJWyyXLNnKocneDmVIqby1HDk3.hUfvXvw8tq4f_8ZZ2k6z_9vpOb4oTcsqA9Scy5R2PynvG5rCB14AYR8GdtyKbK4XmShO.VX9cilN9N93e535RwIc1Vl9bXY6RRDyZQ59e2Xe1P.qI8ZDrVBbxoV.FjINmMc.jxLUkHJbQN9Ys2WAcVh7MLenIF3Vn7jtYWz1fFeM2qzUlS2cGvS0G1l_EvND.7MM823ZrZFJtpAeeg3RJ7eeTlHhITi1fanvlPKk.nmjMwkeZszuThCZrFiw7DO61jG8PBP.9_WIL4RkEic0LCRZUG2NLNRfxy_CjiHbvDf2dGBI4tFjzxF2ymI5LUFbBAaVm45DBWUSrU79sOUFJOKY6uxYdOlbZafpzkXt0mUBCFS2DBF9eRUB.V9hWc8jQY102WxoHrR_T4l91nUSWEvWxSyl3DHrYwLM6OMQK2jdVf058Ge5RPQfpCOBVjS85JI4NVpOeSJp.YH7kRqSPqiNKS9lBdHcxmAgWimvNwuSa9A32IiBFFSY6adg2YEpdTEHk8.qw9o_MFGgz6OEBZ6Tjr0qTFod7lJr8VnfuBVDXAQb6CXJrmQ7q_cDkgohv9PTLSsSDhhi4wawzErTLVR.kI9nuQhsxKwV6mNjoiESVko0pNIPotTuwLGoAtPootG4swlDcSfY2j753A30LSReiEhniHKrBsqtPEP5UO7MoQuZBxUGLlbBE0AvmrLruoynA6abOpXJAJBAh_lf_muIfkGHLOhtwiII785YS4x4detoDU_Wd9f5A5Hx0lKU2d_rn6vx8246Ej.OFyavJMhCZMqmrOW0cjrsLiUb.OhOnIOpc4LBZlK625xpZ5HbNeMrQRfMp_WRMOcXFpU434jn1huPuPSqZqo24R2ChG8afp4yPAJE847UUJnnbKqZ9qyv6fdZuPdJOLHwTv8.wODiv7xoNQoK6N2P.7Q2ph.nY6eL704kTPiyTSMIOiC.Uqw4Hkrr5dYTbF.0ndPvS2jaUSyoH7j1khT7jSfJxtui4zOCn36QsF3KGKfwoEI5uAmb6fw5MqyD446rd1jX4tBnalvnzs7EN5UzAzk4mSgclvGjfPtdv1X6IaT_fUTNA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91363ff97dd19fd4';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/abstracts\/search?q=external%20anal%20sphincter%20muscle&__cf_chl_rt_tk=XGUQIYift50ah70F1kKGKtMNpGPIq1_unBijOTeIT04-1739800262-1.0.1.1-JgRDkP1oyn9rpli8vHczFN.svJfrNPHiDQLXk9pYiOo" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>