Polarity in embryogenesis - Wikipedia
The vegetal pole contains large yolky cells that divide very slowly, in contrast with the animal pole above it. In some cases, the vegetal pole is thought to differentiate into the extraembryonic membranes that protect and nourish the developing embryo, such as the placenta in mammals and the chorion in birds.
Cleavage (embryo) - Wikipedia
The pole of the egg with the highest concentration of yolk is referred to as the vegetal pole while the opposite is referred to as the animal pole. Cleavage differs from other forms of cell division in that it increases the number of cells and nuclear mass without increasing the cytoplasmic mass.
DEVELOPMENTAL BIOLOGY 3230 - University of Utah
Placental mammals develop a specialized organ through which the embryo is nourished throughout development and so also have little yolk. Many eggs are polarized with a yolk rich pole, termed the vegetal pole and a yolk poor pole termed the animal pole, eg., frog. The zygotic nucleus is generally displaced towards the animal pole.
Vegetal pole Definition & Meaning - Merriam-Webster
The meaning of VEGETAL POLE is the point on the surface of an egg that is diametrically opposite to the animal pole and usually marks the center of the protoplasm containing more yolk.
An Introduction to Early Developmental Processes
When one pole of the egg is relatively yolk-free, the cellular divisions occur there at a faster rate than at the opposite pole. The yolk-rich pole is referred to as the vegetal pole ; the yolk concentration in the animal pole is relatively low.
2: Fertilization and Cortical Rotation - Biology LibreTexts
The animal and vegetal poles differ in the mRNAs and proteins (see Briefly, Genetics for a refresher on molecular biology terms) 3 and so do the inner and outer parts of the oocyte. Sperm entry induces a change in the way cytoskeletal microtubules interact with each other.
Oocyte Polarity and the Embryonic Axes: The Balbiani Body, an …
The expanded animal character in bucky ball mutants supports a model, whereby establishing vegetal pole identity breaks symmetry and regulates or alternatively indirectly influences the extent of the animal territory; however, the mechanism linking patterning of …
The Early Development of Sea Urchins - Developmental Biology
The cells at the vegetal pole of the blastula begin to thicken, forming a vegetal plate. The cells of the animal half synthesize and secrete a hatching enzyme that digests the fertilization envelope ( Lepage et al. 1992 ; Figure 8.11C ).
Animal development - Embryogenesis, Morphogenesis, …
At one pole, known as the animal pole, the cytoplasm appears to be more active and contains the nucleus (meiotic divisions occur in this region); at the other, called the vegetal pole, the cytoplasm is less active and contains most of the yolk.
Animal development - Embryo Formation, Cell Differentiation ...
As a consequence of the infolding at the vegetal pole, the blastocoel is reduced or obliterated, and a new cavity is created, the primitive gut cavity, or archenteron, which eventually gives rise to the hollow core (lumen) of the alimentary canal.