EXOCHORION Meaning and
Definition
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Exochorion is a term primarily used in the field of entomology to refer to the outermost protective layer or covering found on the eggs of certain insect species. This term is specifically applied when discussing the eggs of mosquitoes and other insects that reside in aquatic environments.
The exochorion plays a crucial role in protecting the developing embryos from various environmental factors such as desiccation, microbial infections, and predation. It is often composed of a tough and flexible material that helps shield the eggs from physical damage. Additionally, the exochorion is impermeable to water, which prevents excessive water loss and maintains a suitable moisture level necessary for embryonic development.
The structure and appearance of the exochorion vary among different insect species. It can be smooth or rough, depending on the presence of specific external sculpturing. In some cases, the exochorion may possess spines, filaments, or other unique features that further assist in protection against external threats.
The exochorion, along with other layers such as the endochorion and serosal cuticle, constitutes the chorion of an insect egg. These layers work together to safeguard the developing embryo and ensure its survival until hatching. By examining the characteristics of the exochorion, entomologists can gain valuable insights into the reproductive strategies, habitat preferences, and evolutionary adaptations of different insect species.
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The layer of the chorion derived from the ectoderm.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for EXOCHORION
- exochorign
- exochorimn
- exochorinn
- exochoriof
- exochoriol
- exochorioo
- exochoarion
- e xochorion
- ex ochorion
- exo chorion
- exoc horion
- exoch orion
- exocho rion
- exochor ion
- exochori on
- exochorio n
Etymology of EXOCHORION
The word "exochorion" is derived from the combination of two Greek roots: "exo" meaning "outer" or "outside", and "chorion" meaning "skin" or "membrane".
In biology, "chorion" typically refers to an outer protective membrane that surrounds the embryo of certain organisms. The addition of the prefix "exo-" emphasizes the external nature of the membrane, distinguishing it from other layers or structures. Therefore, "exochorion" can be understood as the outer layer or membrane surrounding an embryo.
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