- All Journals
- Al-Qadisiyah University
- Basrah University
- Kirkuk University
- Mosul University
- The Iraqi Borad for Medical Specialization
- University of Anbar
- University of Technology
- Al Mustafa University
- Al-Zahraa University for Women
- Alnoor University
- Kunooz University
- Misan University
- Ninevah University
- Tikrit University
- University of Al-Hamdaniya
- University of Kerbala
Early Embryology of the Prechordal Region | ||
| Journal of the Faculty of Medicine | ||
| Article 1, Volume 47, Issue 1, 2005, Pages 68-72 | ||
| Author | ||
| M. Hayawi Hammash | ||
| Abstract | ||
| 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. | ||
| Keywords | ||
| Chick embryo; Cephalic foregut; Prechordal plate; Prechordal mesoderm; Mesoendoderm; Buccopharyngeal membrane | ||
|
Statistics Article View: 155 PDF Download: 15 |
||