The embryo is now called a blastula or early blastocyst.

Cleavage divisions carry the blastula from 64 to 512 cells.

In mammals the blastula is referred to as a blastocyst.

The blastula gives no visible indication of the complex animal into which it will develop.

In most other groups, the blastula undergoes more complicated rearrangement.

After the 7th cleavage has produced 128 cells, the embryo is called a blastula.

You might think of it as the equivalent of a blastula in embryology.

Baer also received credit for the discovery of the blastula.

A blastula is a sphere of cells surrounding a blastocoel.

It contains abundant hydroxyproline and has the appearance of a blastula.

It is the animal hemisphere of the blastula that will eventually become the ectoderm.

Only when the blastocoel is formed does the early embryo become a blastula.

In Xenopus embryos, the blastula is composed of three different regions.

Cleavage ends with the formation of the blastula.

This simple structure, the blastula, must now be moulded by cellular activities into all the shapes that emerge during development.

The germ layers form during gastrulation of the blastula.

The first three to four months are spent with the blastula in suspended development before it implants itself in the placenta.

Blastocyst formation begins at day 5 after fertilization in humans and is closely related to blastula.

The blastocyst must not be confused with the blastula; even though they are similar in structure, their cells have different fates.

After fertilization, a solid and ciliated blastula is created due to superficial cleavage.

In vitro fertilisation involves implantation of a blastula into a mother's uterus.

In a few species, the blastula contains supplies of nutrient yolk and lacks arms, since it has no need to feed.

The crater nest was a blastula of Earth, a chaotic jumble of elements looking for growth and order.

Gastrulation: Blastula continues to grow, cells continue reproducing using mitosis.

In others, normal segmentation occurs in the blastula but gastrulation fails.