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Blastopore in Biological Dictionary

Blastopore

A blastopore is an opening into the archenteron during the embryonic stages of an organism. The distinction between protostomes and deuterostomes is based on the direction in which the mouth (stoma) develops in relation to the blastopore . Protostome derives from the Greek word protostoma me...

Yolk plug

...arge edible endothermal cells surrounded by the blastopore of an ... ... be seen within the confines of t...own as the yolk plug . ... the circular-shaped blastopore and " yolk plug " of vegetal pole macromeres. ....posterior end of the embryo extends ... ... blastopore and Frog yolk plug . These slides only contain...

Primitive streak

...ion is complete the primitive streak disappears. ... The primitive gut that forms during gastrulation in the developing blastula is ... blastopore in amphibians and fish, and the primitive streak in birds and mammals. ... Britannica online encyclopedia article on primitive streak (emb...

Dorsal lip

...Transplant in Amphibian Embryos ... region of the blastopore lip of one embryo will induce gastrulation ...rula in the ... By transplanting the dorsal blastopore lip onto the ventral side of another host ... This dorsal blastopore lip was named the "Organizer" because of its ab...

Deuterostome

...include Echinodermata, Hemichordata and Chordata. ... Most previous hypotheses of deuterostome origins have assumed that the ... Deuterostome . blastopore becomes: mouth. mouth. anus. anus. anus. cleavage: ... phyla and the chaetognaths) should be included in the deuterostome clade. ... They lack...

Archenteron

.... ... gastrula n. , pl. -las or -lae ( ). An embryo at the stage following the blastula, consisting of a ... archenteron . neurula. gastrulate. blastopore ... ... staining is detected in the invaginating archenteron (an endomesodermal tissue) ... mesenchyme founder cells, which occupy the tip of th...
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