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Early embryology of the prechordal region
المؤلف
المصدر
Journal of the Faculty of Medicine Baghdad
العدد
المجلد 47، العدد 1 (31 مارس/آذار 2005)3ص.
الناشر
تاريخ النشر
2005-03-31
دولة النشر
العراق
عدد الصفحات
3
التخصصات الرئيسية
الملخص EN
Background: Prechordal plate is important midline structure in the head region.
It has been shown that it plays a bivotal role in the development of the brain and the eyes.
Aim of study: There is confunsion, in the literatures and textbooks concerning of terms: prechordal plate, prechordal mesoderm and the Buccopharyngeal membrane.
The aim of this work is to study is based on histological changes of the early stages of the chick embryo hoping to illuminate these aspects especially after the recent revival of attention to the importance of this region in the process of induction of the brain region of the newral tub & the development of the prosencephalon & the eyes as shown by genes activities & expression in the prechordal plate ..
Materials & Methods :this study is based on histological description of the early stages (4- 7H.&H.) of the chick embryo to illuminate the nature of these structures .
It appeared that the cephalic foregut in the early stages is lined by tall endodermal cells that form three regions: Dorsal wall (PI) where it forms the prechordal plate and contributes to the formation of the prechordal mesodermal mass (mesoendoderm); the rostral end (P2), and the ventral wall (P3) where it fuses with the surface ectoderm forming the oral plate (or the Buccopharyngeal membrane).
The contribution of endoderm to the head mesenchyme is emphasized in this study.
Conclution: this study indicated that the prechordal plate is not simply the Buccopharyngeal membrare it forms an early proliferating zone , rostal to the notochord , that contribute to the mass of prechordal mesoderm & another zone , which is extending later as a Sessels pouch , which also proliferate for some time .
also the ventral extension is a part of Buccopharyngeal membrane.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Hammash, M. Hayawi. 2005. Early embryology of the prechordal region. Journal of the Faculty of Medicine Baghdad،Vol. 47, no. 1.
https://search.emarefa.net/detail/BIM-362551
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Hammash, M. Hayawi. Early embryology of the prechordal region. Journal of the Faculty of Medicine Baghdad Vol. 47, no. 1 (2005).
https://search.emarefa.net/detail/BIM-362551
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Hammash, M. Hayawi. Early embryology of the prechordal region. Journal of the Faculty of Medicine Baghdad. 2005. Vol. 47, no. 1.
https://search.emarefa.net/detail/BIM-362551
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-362551
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
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