File:Mon345778676.png

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مصرى: مرحلة نضج البويضة

-يفرز الفص الامامى للغدة النخامية هرمون التحوصل FSH الجريبي الذى يعمل على نمو الحويصلات في المبيض و يحفز المبيض لتحويلها الي حويصلة جراف المحتوية على البويضة. ب-يستغرق نمو حويصلة جراف حوالى عشرة ايام ح-تفرز حويصلة جراف اثناء نموها هرمون الاستيروجين الذى يعمل على انماء بطانة الرحم

مرحلة التبويض -تبدا عندما يفرز الفص الامامى للغدة النخامية الهرمون اللوتينى LH الذي يحفز تكوين الجسم الأصفر فى اليوم الرابع عشر من بدء الطمث ويؤدى الى انفجار حويصلة جراف وتحرر البويضة وتكون الجسم الأصفر من بقايا حويصلة جراف ب-يفرز الجسم الاصفر هرمونا البروجسترون ويعمل على زيادة سمك بطانةالرحم وزيادة الامداد الدموى بها (حوالى 14 يوم )

مرحلة الطمث

اذا لم تخصب البويضة يبدا الجسم الاصفر فى الضمور التدريجى ويقل افراز هرمون البروجسترون ويؤدى ذلك الى تهدم بطانة الرحم وتمزق الشعيرات الدموية مما يسبب انقباضات الرحم فيؤدى الى خروج الدم فيما يسمى (بالطمث )الذى يستغرق من 3 -5 ايام ثم تبدا دورة جديدة للمبيض الثانى
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current08:35, 29 January 2021Thumbnail for version as of 08:35, 29 January 2021727 × 658 (247 KB)Mohgan73 (talk | contribs)Uploaded own work with UploadWizard

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