Definition

1. Noun:
   • The inner germ layer in an embryo: In embryology, 'entoderm' refers to the innermost of the three primary germ layers (ectoderm, mesoderm, entoderm) of a developing animal embryo.
   • The source of internal linings: This layer gives rise to the epithelial linings of the digestive tract, respiratory system, and associated organs.

Usage Examples

• Noun:
  • During gastrulation, the entoderm is formed and will eventually become the gut lining.
  • The lungs and liver develop from tissues originating in the entoderm.

Advanced Usage

• "Derived from the entoderm": Used to describe organs or tissues that originate from this germ layer.
  • The thyroid gland is derived from the entoderm.

Variants and Related Words

• Endoderm: This is the more common and preferred modern spelling and synonym for 'entoderm'.
• Entodermal (adj): Pertaining to the entoderm.
  • The entodermal cells differentiate into specific organ tissues.
• Endodermal (adj): The more common adjectival form.
• Hypoblast: An earlier, related term sometimes used synonymously in certain contexts of early development.

Synonyms

• Endoderm: The primary synonym.
• Hypoblast: (In early embryology) the lower layer of the blastoderm.

Related Terms (Conceptual)

• Germ layer: A primary layer of cells in an embryo from which tissues and organs develop.
• Ectoderm: The outermost germ layer.
• Mesoderm: The middle germ layer.

Noun

1. the inner germ layer that develops into the lining of the digestive and respiratory systems