Definition

1. Noun:
   • The outer germ layer in an embryo: In embryology, the exoderm is the outermost of the three primary germ layers of an early embryo. It develops into the epidermis (skin) and the nervous system.

Usage

• The term "exoderm" is a specialized scientific term used primarily in the fields of embryology, developmental biology, and zoology. It is not commonly used in everyday conversation.

Examples

• Noun:
  • During gastrulation, the embryo forms three germ layers: the endoderm, mesoderm, and exoderm.
  • The exoderm gives rise to structures such as the skin, hair, and the entire nervous system.

Advanced Usage

• "Exodermal" (adjective): Pertaining to or derived from the exoderm.
  • The exodermal cells differentiate into neural crest cells.

Variants and Related Words

• Synonym: Ectoderm. "Ectoderm" is the more commonly used and preferred term in modern scientific literature. "Exoderm" is a less frequent synonym.
• Related Term: Germ layer. A primary layer of cells in an embryo from which tissues and organs develop.

Synonyms

• Ectoderm: The outer germ layer that develops into the integumentary system (skin, hair, nails) and the nervous system.

Notes

• The word "exoderm" is formed from the Greek roots "exo-" meaning "outside" and "-derm" meaning "skin." It is important to distinguish it from the "epidermis," which is the outermost layer of the skin in a developed organism, derived from the exoderm/ectoderm.

Noun

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