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url url url url
  2. Weltenzyklopädie
  3. لانه‌گزینی (جنین انسان) - ویکی‌پدیا، دانشنامهٔ آزاد
لانه‌گزینی (جنین انسان) - ویکی‌پدیا، دانشنامهٔ آزاد
از ویکی‌پدیا، دانشنامهٔ آزاد
بارآوری در انسان‌ها. با به‌هم‌پیوستن اسپرم و تخمک از راه لقاح، یک کانسپتوس ایجاد می‌شود و در طول زمانی نزدیک به ۹ روز در دیوارهٔ رحم کِشت خواهد شد، که برای یک دورهٔ ۹ ماهه در آنجا خواهد ماند.

لانه‌گزینی یا کاشت (به انگلیسی: implantation)، در انسان، نخستین مرحلهٔ بسیار ابتدایی بارداری است که در آن کانسپتوس به دیوارهٔ رحم می‌پیوندد (ازاین پس جنین خوانده می‌شود). در این مرحله از پیشرفت دوران بارداری، جنین یک بلاستوسیست است. از راه این پیوستگی‌است که جنین می‌تواند مواد مغذی و اکسیژنی را که برای رشد خود به آن‌ها نیاز دارد از مادر دریافت کند.

در انسان، لانه‌گزینیِیک تخمک بارور شده به احتمال زیاد در حدود ۹ روز، و در نهایت بین ۶ و ۱۲ روز پس از تخمک‌گذاری رخ می‌دهد.[۱]

شکست در کاشت

دو سوم از شکست یا عدم موفقیت در لانه‌گزینی به «پذیرش ناکافی رحم» و یک سوم دیگر به «مشکلات خود جنین» مربوط دانسته‌شده‌است.[۲] پذیرش ناکافی رحم ممکن است توسط سیتوکین‌های غیرطبیعی و سیگنال‌های هورمونی و همچنین در اثر تغییرات وراژنتیک باعث شود.[۳]

جستارهای وابسته

منابع

  1. ↑ Wilcox AJ, Baird DD, Weinberg CR (1999). "Time of implantation of the Conceptus and loss of pregnancy". New England Journal of Medicine. 340 (23): 1796–1799. doi:10.1056/NEJM199906103402304. PMID 10362823.
  2. ↑ Melford, S. E.; Taylor, A. H.; Konje, J. C. (2013). "Of mice and (wo)men: factors influencing successful implantation including endocannabinoids". Human Reproduction Update. 20 (3): 415–428. doi:10.1093/humupd/dmt060. ISSN 1355-4786. PMID 24306146.
  3. ↑ Cakmak, H.; Taylor, H. S. (2010). "Implantation failure: Molecular mechanisms and clinical treatment". Human Reproduction Update. 17 (2): 242–253. PMC 3039220 Freely accessible. doi:10.1093/humupd/dmq037.
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