Blastopore
Blastopore
The blastopore (/ˈblæstəpɔːr/; from the Greek blastos meaning "sprout" and poros meaning "opening, passage") is a structure observed in the early embryonic development of animals. It is the opening of the central cavity of an embryo in the gastrula stage.
Definition
The blastopore is the first opening that forms in the process of gastrulation, the phase of embryonic development that follows blastulation. It is through the blastopore that cells migrate into the embryo, subsequently forming the mesoderm and endoderm.
Development
During the process of gastrulation, the blastopore can develop into the mouth (a process known as protostomy) or the anus (a process known as deuterostomy) depending on the species. In deuterostomes, which include vertebrates, the blastopore becomes the anus while the mouth forms secondarily. In protostomes, which include invertebrates like insects and mollusks, the blastopore becomes the mouth.
Related Terms
- Gastrulation: The phase of embryonic development that follows blastulation and during which the blastopore forms.
- Protostomy: A developmental mode in some animals where the blastopore becomes the mouth.
- Deuterostomy: A developmental mode in some animals where the blastopore becomes the anus.
- Mesoderm: The middle layer of an embryo in early development, between the endoderm and ectoderm.
- Endoderm: The innermost layer of cells or tissue of an embryo in early development.
See Also
External links
- Medical encyclopedia article on Blastopore
- Wikipedia's article - Blastopore
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