noun

definition

An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.

Examples of blastula in a Sentence

Then follows the phenomenon of gastrulation, by which onehalf of the blastula is invaginated into the other, so as to obliterate the segmentation cavity.

The result of cleavage in all cases is a typical blastula, which when set free becomes oval and develops a flagellum to each cell, but when not set free, it remains spherical in form and has no flagella.

When the blastula is oval and freeswimming the inner mass is formed by unipolar immigration from the hinder pole.

Thus a planula larva may be a blastula, or but slightly advanced beyond this stage, or it may be (and most usually is) a parenchymula; or in some cases (Scyphomedusae) it may be a gastrula.

When the blastula is spherical and not set free, the germ-layer formation is always multipolar, either by immigration or by delamination, i.e.

If the embryo is set free as a free-swimming, so-called planula-larva, in the blastula, parenchymula, or gastrula stage, then a free actinula stage is not found; if, on the other hand, a free actinula occurs, then there is no free planula stage.

This is the blastula stage occurring universally in all Metazoa, probably representing an ancestral Protozoan colony in phylogeny.

Disclaimer

Scrabble® Word Cheat is an incredibly easy-to-use tool that is designed to help users find answers to various word puzzles. With the help of Scrabble Word Cheat, you can easily score in even the most difficult word games like scrabble, words with friends, and other similar word games like Jumble words, Anagrammer, Wordscraper, Wordfeud, and so on. Consider this site a cheat sheet to all the word puzzles you have ever known.

Please note that SCRABBLE® is a registered trademark. All intellectual property rights for the game are owned by Hasbro Inc in the U.S.A and Canada. J.W. Spear & Sons Limited of Maidenhead, Berkshire, England (a subsidiary of Mattel Inc.) reserves the rights throughout the rest of the world. Also, Mattel and Spear are not affiliated with Hasbro. Words with Friends is a trademark of Zynga with Friends.

Scrabblewordcheat.com is not affiliated with SCRABBLE®, Mattel Inc, Hasbro Inc, Zynga with Friends, or Zynga Inc in any way. This site is only for entertainment and is designed to help you crack even the most challenging word puzzle. Whenever you are stuck at a really difficult level of Scrabble or words with friends, you will find this site incredibly helpful. You may also want to check out: the amazing features of our tool that enables you to unscramble upto 15 letters or the advanced filters that lets you sort through words starting or ending with a specific letter.

Top Search