amnion

/'æmniən/

Thân thiện

A diagram shows the amnion surrounding a developing chick embryo.

Definition

1. Noun:
   • A thin, innermost membranous sac: The amnion is a thin, fluid-filled sac that surrounds and protects the developing embryo or fetus of higher vertebrates, including reptiles, birds, and mammals.

Usage

• The term "amnion" is a specialized biological and medical term. It is used to describe a specific anatomical structure during embryonic development.
• It is typically used in scientific, medical, and zoological contexts.

Examples

• Noun:
  • The amnion forms early in embryonic development.
  • The fluid within the amnion, called amniotic fluid, cushions the fetus.
  • In mammals, the amnion is a key component of the amniotic egg.

Advanced Usage

• "Amniotic": This is the related adjective form.
  • Amniotic fluid is crucial for fetal development.
• The condition of having an amnion defines the group "Amniota," which includes reptiles, birds, and mammals.

Variants and Related Words

• Amniotic (adj): Of or relating to the amnion or amniotic fluid.
  • The doctor performed an amniotic fluid test.
• Amniocentesis (n): A medical procedure involving the extraction of amniotic fluid for testing.
  • Amniocentesis can be used to check for genetic disorders.

Synonyms

• Amniotic sac: A common synonym, often used in medical contexts.
  • The ultrasound showed a healthy amniotic sac.

Notes

• The plural form is amnia or amnions.
• The amnion is a defining characteristic of amniotes, distinguishing them from amphibians and fish.

Học thuật

Noun

1. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

Từ đồng nghĩa

• amniotic sac
• amnios