What are the features of blastula?

Blastula, hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg. The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel.

What are the main structures you observe in ts of blastula?

The blastula is made up of a hollow spherical layer of cells, referred to as the blastoderm which surrounds a yolk or fluid-filled space called the blastocele or blastocoel. In most mammals, including humans, the structure formed next is the blastocyst, a mass of inner cells that are distinct from the blastula.

What does the blastula develop into?

The blastula eventually organizes itself into two layers: the inner cell mass (which will become the embryo) and the outer layer or trophoblast (which will become the placenta ); the structure is now called a blastocyst.

What is the blastula stage of embryonic development?

An early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence.

What are the types of blastula?

1 Coeloblastula It is a hollow blastula containing a large spacious blastocoel. Usually, the blastocoel is filled with a fluid containing mucopolysaccharides. The blastula resulting from holoblastic equal ceavage, as in the case of echinoderms and amphioxus, is called equal coeloblastula .

What is true blastula?

So, the correct answer that describes a blastula is ‘A hollow ball of cells with a fluid-filled cavity called a blastocoel’.

What is difference between morula and blastula?

The main difference between morula and blastula is that morula is a spherical mass of blastomeres, which are formed following the splitting of a zygote whereas blastula is an early developmental stage of the embryo, consisting of a spherical layer of cells filled with fluid.

What is the 32 cell stage?

Morula is a cell type which undergoes mitotic division thereby resulting in the production of around 32 cells. This 32-cell stage is thus referred to as blastula wherein all the cells are of the same size as that of the zygote.

What are the 3 stages of embryonic development?

The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.

What are the 4 stages of embryonic development?

Contents

• Germinal stage. 1.1 Fertilization. 1.2 Cleavage. 1.3 Blastulation. 1.4 Implantation. 1.5 Embryonic disc.
• Gastrulation.
• Neurulation.
• Development of organs and organ systems.

What is meant by Stereoblastula?

: a blastula without a cavity.

What is blastula or blastocyst?

Definition. Blastula refers to an animal embryo at the early stage of development when it is a hollow ball of cells whereas blastocyst refers to mammalian blastula in which some differentiation of cells has occurred. Thus, this is the main difference between blastula and blastocyst.

How to study the TS of the blastula?

To observe the TS of mammalian blastula through permanent slides. Observe the permanent slide under a microscope and note down the features of TS of the mammalian blastula. Blastula appears as a sphere with a cavity known as blastocoel. An outer layer of blastomeres known as trophoblasts is observed.

How are the cells of the blastula formed?

You can learn more about this topic in the related articles below. Blastula, hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg. The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel.

How is the blastula related to the gastrula?

The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel. After the blastula develops, it undergoes transition to the gastrula ( q.v. ), a process called gastrulation. In organisms such as mammals, the earlier morula ( q.v.

What does the Greek word blastulation mean in Greek?

Blastulation: 1 – morula, 2 – blastula. The blastula (from Greek βλαστός (blastos), meaning ” sprout “) is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity called the blastocoele formed during an early stage of embryonic development in animals.