Cleavage

Cleavage: what is it and how does it happen?

In embryology, division, or cleavage, is the first stage in the development of a fertilized egg. During the process of cell division, the cells of a fertilized egg split into two daughter cells, which then continue to divide to form a cluster of cells known as a blastocyst.

Division occurs due to the contraction of the cytoplasm around the cell nucleus, which leads to its division into two parts. Because the cytoplasm does not increase in size, each daughter cell receives half the original volume of cytoplasm and nucleus. This process continues further as the cells divide into smaller cells called blastomeres or blastomeres.

It is important to note that in the intervals between each cell division, the blastomeres do not grow, but decrease in size. This occurs because each blastomere receives only half the cytoplasm and nucleus from its mother cell, and therefore becomes smaller. In addition, each blastomere also receives its own mitochondria and other organelles necessary for its survival and growth.

Ultimately, the blastocyst, consisting of many blastomeres, reaches the stage at which various cellular layers begin to form, which in turn lead to the formation of all the tissues and organs of the future organism.

In conclusion, cleavage is an important stage of embryonic development that results in the development of a fertilized egg into a multicellular organism. Thanks to this process, the cells of the embryo quickly grow, forming all the necessary tissues and organs for the unborn child.

Fission (in embryology) is the repeated division of a fertilized egg cell to form a clump of cells that then develops into a blastocyst. In the intervals between each subsequent division, cells (blastomeres) do not grow, thus decreasing in size.

Division begins immediately after fertilization and continues for several days. With each division, the number of cells doubles, forming the so-called morula. After several cycles of division, a cavity is formed in the center of the cluster of cells - this is the blastocyst.

Division occurs very quickly and synchronously. This process is critical for the proper development of the embryo. Any division disorders can lead to serious developmental pathologies.

Division (cleavage) is a process that occurs in embryology during the formation of a blastocyst.
During this process, the fertilized egg cell divides again, resulting in a clump of cells.

Division is important for the development of the embryo, as it allows it to grow and develop.

When a cell divides, the size of the cells that are formed as a result of division decreases.

This process is an important step in embryo development and can be used as an indicator of the health of the embryo.