Embryo demarcation and Mesoblast metamerization

General information:

•Period when embryogenesis ends and organogenesis begins
•The process of cell division and differentiation intensifies in the embryo
•Determination of the embryo in relation to its appendages
•Constriction of the lecithocoel (area II)
•Segmentation of the intraembryo mesoblast
•The end of neurulation

Neurulation Organogenesis

Neurulation: 

Morphogenetic process

Formation of the neural plate and neural tube, thus giving the nervous system its final shape and position in the dorsal axis of the embryo

Gastrulation in mammals, amphibians and chickens

Gastrulation corresponds to the second phase of embryonic development, during which mitotic activity continually slows down. The embryo's volume remains constant.
• It is a stage marked by the transition from the blastocyst (blastula), the early stage of embryonic development, to the gastrula stage..

General information on embryology, Cleavage

I. Embryonic Development

a. Definition, History, Embryological Techniques, Terminology,

b. Pre-embryonic

c. Embryonic

II. Primordial Morphogenesis (Morula - Early Gastrula) 2nd, 3rd Week

III. Secondary morphogenesis (Gastrula) 4th week

IV. Longitudinal and transverse demarcations (Transformation of the flat tridermal embryonic disc into a C-shaped cylindrical structure)

V. Neurulation and delimitation of the cephalic end

VI. Establishment of the heart and vascular system of the embryo

VII. Morphogenesis of the caudal region

VIII. Embryonic appendages: umbilical cord, membranes, placenta

IX. Definitive morphogenesis

X. Morphogenetic mechanisms

XI. Comparative and evolutionary embryology