BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms...

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BLASTULA

Transcript of BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms...

Page 1: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

BLASTULA

Page 2: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

• Blastula is a hollow sphere of blastomeressurrounding a cavity.

• The cavity of blastula is called blastocoel.

• The process of formation of blastula isknownas blastulation.

• Blastula -32-64 cell stage

Page 3: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

DIFFERENT TYPES OF BLASTULA

• The blastula of various groups of animalsdiffers in form and structure depending upona variety of factors such as the size of theamount and distribution of yolk etc. Thefollowing categories of blastulae have beenrecognized in different groups of animals

Page 4: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

Coeloblastula

• It is a hollow blastula containing a largespacious blastocoel.

• The blastocoel is filled with a fluid containingmucopolysaccharides.

•

Page 5: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

• The blastula resulting from holoblastic equalcleavage, as in the case of echinoderms andamphioxus, is called equal coeloblastula .

• The blastoderm is single layered.

• Holoblastic unequal cleavage, as in frog,results in unequal coeloblastula.

• lt has a blastocoel displaced towards theanimal pole and a multilayered blastoderm.

Page 6: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

Stereoblastula• This type of blastula is composed of an

aggregate of larger sized and relativelylesser number of cells without or withextremely small blastocoelic space inthe centre.

• Stereoblastula occurs in a variety ofanimals such as insects, some wormslike Nereis, mollusks like Cripidula,gymnophionan amphibians and certainfishes.

Page 7: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

Discoblastula• Discoblastula consists of a disc

- shaped mass of blastomeresoverlying a large yolk mass.

• This blastula is the result ofmeroblastic discoidal cleavageas in most fishes, reptiles andbirds.

• There is no blastocoel, insteada slit like cavity calledsubgerminal cavity appears inbetween the blastoderm andthe yolk mass.

Page 8: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

Blastocyst• It is the blastula stage of

mammals;• It consists of a hollow spherical

vesicular blastula, containingan inner cell mass at the animalpole.

• The embryo proper developsfrom the inner cell mass.

• The outer single layer of cellswhich encloses the blastocoelis called the trophoblast.

• The trophoblast establishesrelations with uterine wall andhelps in nutrition of thedeveloping embryo

Page 9: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

Periblastula

• A stage in the embryonic development ofmost arthropods having centrolecithal eggs.

• The periblastula is a vesicle whose wallconsists of one layer of cells and whose cavityis filled with unbroken yolk.

• It forms as a result of the superficialsegmentation of the egg.

Page 10: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

Fate Map

Page 11: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

• Fate map is t

Page 12: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 13: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 14: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 15: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 16: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 17: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 18: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 19: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 20: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 21: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 22: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 23: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 24: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 25: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 26: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 27: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 28: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 29: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 30: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 31: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.
Page 32: BLASTULA...•The blastula resulting from holoblastic equal cleavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula. •The blastoderm is single layered.

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In an early branching metazoan, bacterial colonization of ...oocytes develop outside the female into a coeloblastula (Fig. 1A). The developing embryo lacks any protective structure

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Stádia embryonálního vývoje: 1. BLASTULA€¦ · 29 Neurální lišta ... • Asymetrie (Porifera) • Radiální symetrie (Cnidaria) • Bilateriální symetrie (Bilateralia)

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