List of MeSH codes (A17)

List of MeSH codes (A17) refers to a specific category within the Medical Subject Headings (MeSH) system, which is a comprehensive controlled vocabulary for the purpose of indexing journal articles and books in the life sciences. MeSH codes facilitate searching for subjects within databases such as PubMed by categorizing topics with unique identifiers. The A17 category encompasses terms related to the Embryonic Structures, which are critical in the study of embryology, developmental biology, and related medical fields.

Overview

The MeSH system is organized into a tree structure, where broader categories branch into more specific topics. The A17 category, focusing on embryonic structures, includes a variety of terms that describe the early formations and systems in developing organisms. These structures are foundational in understanding the complex processes of development from a fertilized egg to a fully formed organism.

List of MeSH Codes (A17)

Below is a detailed list of MeSH codes within the A17 category, highlighting the key embryonic structures and their significance:

• A17.360 - Blastocyst: A structure formed in the early development of mammals. It possesses an inner cell mass, which eventually forms the embryo, and an outer layer known as the trophoblast, which forms part of the placenta.
• A17.360.094 - Blastomeres: Cells formed by the division of the zygote after fertilization. They are the building blocks of the blastocyst.
• A17.360.750 - Trophoblasts: Cells forming the outer layer of the blastocyst, playing a crucial role in implantation and interaction with the maternal endometrium.
• A17.360.520 - Embryo, Mammalian: Refers to the early stages of mammalian development following the blastocyst stage until the point of birth.
• A17.360.520.190 - Chorion: An extraembryonic membrane that contributes to the formation of the placenta.
• A17.360.520.250 - Embryo, Nonmammalian: Embryonic development in non-mammalian species, which can offer comparative insights into embryological processes.
• A17.360.520.575 - Yolk Sac: An important embryonic structure in many vertebrates, providing nutrition to the developing embryo.

Importance of Embryonic Structures

Understanding embryonic structures is crucial for several reasons:

• It helps in the diagnosis and treatment of congenital anomalies.
• It provides insights into the mechanisms of development, which can inform regenerative medicine and stem cell research.
• It aids in understanding evolutionary biology and the changes in developmental processes over time.

See Also

• Developmental Biology
• Congenital Abnormalities
• Regenerative Medicine
• Stem Cell Research