Definition

1. Noun:
   • The outer germ layer that develops into skin and nervous tissue: In embryology, the 'ectoblast' is the outermost layer of cells in an early embryo, which gives rise to structures such as the epidermis, hair, nails, and the entire nervous system including the brain.

Usage

• The term 'ectoblast' is a specialized scientific term used primarily in the fields of embryology, developmental biology, and zoology. It is synonymous with the more commonly used term 'ectoderm'. It is used to describe a fundamental layer in the early development of multicellular animals.

Examples

• Noun:
  • During gastrulation, the embryo forms three primary germ layers: the ectoblast, mesoblast, and endoblast.
  • The neural crest is a population of cells that delaminate from the ectoblast.
  • The ectoblast is responsible for forming the outer covering of the body and the central nervous system.

Advanced Usage

• "Ectoblastic" (adjective): Pertaining to or derived from the ectoblast.
  • The epidermis is an ectoblastic tissue.

Variants and Related Words

• Ectoderm: This is the more frequently used synonym for 'ectoblast' in modern scientific literature.
• Epiblast: In mammalian development, the epiblast is the tissue that gives rise to the ectoderm (ectoblast) and other germ layers. It is a related but distinct concept.

Synonyms

• Ectoderm: The outer germ layer of an embryo.

Antonyms

• Endoblast / Endoderm: The innermost germ layer that develops into the lining of the digestive and respiratory tracts.
• Mesoblast / Mesoderm: The middle germ layer that develops into muscles, bones, and the circulatory system.

Noun

1. the outer germ layer that develops into skin and nervous tissue