The word "blastodermic disc" refers to the first embryonic tissue formed during the early stages of development in some animal embryos. The IPA phonetic transcription of this word is /ˌblæstoʊˈdɜrmɪk dɪsk/, which can be broken down into its individual phonemes: "bl-ah-s-t-oh" (blast), "d-er-m-i-k" (dermic), and "d-ih-s-k" (disc). The word is spelled with two "d"s, as it is derived from the Greek prefix "blast-" meaning "germ" or "bud", and the Greek root "-derm" meaning "skin" or "layer".
A blastodermic disc is a term used in embryology to describe a specialized cluster of cells that forms during the early stages of embryonic development in animals. Specifically, it refers to the disc-shaped group of cells that forms on the surface of the yolk in a developing egg.
In species that undergo internal fertilization, such as mammals, the blastodermic disc is highly significant as it is the region where the formation of the embryo occurs. This disc contains all the necessary cells which will eventually develop into different tissues and organs of the growing organism.
The blastodermic disc is formed after the process of fertilization, when the sperm and egg fuse to create the zygote. This zygote initially divides into a few cells, which then multiply and arrange themselves into a flattened structure on top of the yolk. This disc-like cluster of cells is the blastodermic disc.
From this stage, the cells within the blastodermic disc start to differentiate and specialize, with some cells becoming the ectoderm (outer layer) and others becoming the endoderm (inner layer). These layers are essential for the development of different body structures, including the nervous system, skin, and gut.
Overall, the blastodermic disc is a crucial early stage in embryonic development, responsible for initiating the formation of the embryo in many animals that lay eggs. It acts as a foundation for the subsequent growth and differentiation of cells, leading to the development of a fully formed individual.
The germinal d. of an ovum after segmentation of the vitellus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The word "blastodermic disc" is derived from the combination of two terms: "blastoderm" and "disc".
The term "blastoderm" comes from the Greek words "blastos" meaning "germ" or "embryo", and "derma" meaning "skin" or "layer". In embryology, the blastoderm refers to the layer of cells formed during early embryonic development, which eventually gives rise to the different tissues and organs of an organism.
The term "disc" is derived from the Latin word "discus", meaning "disk" or "round flat object". In this context, it refers to the shape or structure of the blastoderm.
Therefore, "blastodermic disc" refers to the circular or disk-like layer of cells that forms during the early stages of embryonic development.