blastopore

The story is a little more complex, because the blastopore itself does not go on to become the mouth.

The open end of the archenteron is called the blastopore.

Two major groups of animals can be distinguished according to the blastopore's fate.

In most animals, a blastopore is formed at the point where cells are entering the embryo.

However, in bryozoans the blastopore closes, and a new opening develops to create the mouth.

A blastopore is an opening into the archenteron during the embryonic stages of an organism.

The one exception is the anterior portion of the dorsal blastopore lip.

This dent, the blastopore, deepens to become the archenteron, the first phase in the growth of the gut.

In many animals the blastopore, an opening in the surface of the early embryo, tunnels through to form the gut.

In protostome development, the first opening in development, the blastopore, becomes the animal's mouth.

The overhang appears similar to the dorsal blastopore lip in amphibian embryos, and we give it that name.

The coelom is formed by schizocoely, and the blastopore (a dent in the embryo) becomes the mouth.

Its ancestral role, or at least the role it plays in the Cnidaria, appears to be in defining the blastopore.

An alternative way to develop two openings from the blastopore during gastrulation, called amphistomy, appears to exist as well in animals like nematodes.

A transplanted blastopore lip can convert ectoderm into neural tissue and is said to have an inductive effect.

The embryonic shield has the same function as the dorsal lip of the blastopore and acts as the organizer.

Each is controlled by the dorsal blastopore, and primitive node (also known as Hensen's node), respectively.

The distinction between protostomes and deuterostomes is based on the direction in which the mouth (stoma) develops in relation to the blastopore.

The deuterostome mouth develops at the opposite end of the embryo from the blastopore and a digestive tract develops in the middle connecting the two.

In deuterosomes, the mouth develops at a later stage, at the opposite end of the blastula from the blastopore, and a gut forms connecting the two.

At the same time, when this thin layer of dividing cells reaches the dorsal lip of the blastopore, another process occurs termed convergent extension.

During the gastrula stage, once the blastopore has formed, the PMCs are localized within the prospective ventrolateral (from front to side) region of the blastocoel.