Haeckel portrays a concrete demonstration of his Biogenetic Law through his Gastrea theory, in which he argues that the early cup-shaped gastrula stage of development is a universal feature of multi-celled animals.
32.
For example, humans start life as an egg, a near perfect sphere; they then become a gastrula with radial symmetry, then a simple embryo with bilateral symmetry, and then, when organs develop, an asymmetrical baby.
33.
"' Gastrulation "'is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar ( " three-layered " ) structure known as the "'gastrula " '.
34.
During the blastula and gastrula stages, " Wnt " as well as FGF pathways will induce the antero-posterior axis formation, regulate the precise placement of the primitive streak ( gastrulation and mesoderm formation ) as well as the process of neurulation ( central nervous system development ).
35.
Organic form in the drawing resembling a gastrula can be interpreted as an immersion of what was on the surface into the inside, into the darkness, into the closure from the outside world ( " Remembering an idea ", charcoal on canvas, 210 x 240 cm, 2005-6 ).
36.
In " Xenopus laevis " " Xbra " ( the " Xenopus " " T " homologue, also recently renamed " t " ) is expressed in the mesodermal marginal zone of the pre-gastrula embryo followed by localisation to the blastopore and notochord at the mid-gastrula stage.
37.
In " Xenopus laevis " " Xbra " ( the " Xenopus " " T " homologue, also recently renamed " t " ) is expressed in the mesodermal marginal zone of the pre-gastrula embryo followed by localisation to the blastopore and notochord at the mid-gastrula stage.
38.
The gastrula has the shape of a disk with three layers of cells, an inner layer called the endoderm, which gives rise to the lining of most internal organs, a middle layer called the mesoderm, which gives rise to the bones and muscles, and an outer layer called the ectoderm, which gives rise to the skin and nervous system.
39.
Elongation continues through the neurula and tailbud stages & As these involuted dorsal mesodermal tissues converge and extend on the inside of the gastrula, the presumptive posterior neural tissue converges and extends on the outside of the embryo, parallel to the underlying mesoderm, and then rolls up to form the neural tube, which later forms the hindbrain and spinal cord of the central nervous system ".
40.
Timing of development at 7-9�C proceeds as embryos reached the gastrula stage 1.3 days after fertilization, the trochophore stage 2.1 days after fertilization, the veliger stage 3.3 days after fertilization, torsion between 4.5-5 days after fertilization, metamorphosis at 10.5 days, and hatched and crawled out of the egg mass as a juvenile snail at 12.1 days.
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