MEGAMERES Meaning and
Definition
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Megameres are large, distinct regions or sections found within the cytoplasm of certain eggs during early embryonic development. Typically, these eggs undergo a process called holoblastic cleavage, where the fertilized egg divides completely and evenly. However, in the case of eggs with megalithelid development, the division is incomplete, resulting in the formation of large, separate compartments known as megameres.
These megameres are usually visible as discrete regions, each containing its own nucleus and surrounded by a common membrane. They are formed due to differences in the distribution of cytoplasmic factors during cleavage, leading to variation in mitotic activity and cell division rates. This creates distinct cellular territories within the developing embryo.
Megameres play an important role in regulating subsequent developmental processes. They often function as organizers, influencing cell fate determination and pattern formation in the early stages of embryogenesis. Through specific interactions and signaling mechanisms, megameres coordinate the differentiation and specialization of neighboring cells, helping to establish the basic body plan and tissue organization of the developing organism.
The presence or absence of megameres is a significant characteristic observed in the development of various animal species. Their formation and role in embryonic development have been extensively studied in organisms such as mollusks, annelids, and arthropods. Understanding the mechanisms behind megamere formation and their subsequent developmental influence can provide valuable insights into the fundamental processes that shape early animal development.
Common Misspellings for MEGAMERES
Etymology of MEGAMERES
The word "megameres" comes from the combination of two components: "mega" and "meres".
"Mega" is a Greek prefix meaning "great" or "large". It is derived from the Greek word "megas". In English, it is often used to signify something of great size, magnitude, or importance, like in words such as "megabyte" or "megastar".
"meres" is a plural form of the word "mere", which is derived from the Old English word "mǣre". In this context, "mere" refers to a segment or a part.
Therefore, "megameres" is a term that combines the Greek prefix "mega" with the English plural suffix "-meres" to describe large or greatly significant segments or parts.
