Definition

1. Noun:
   • The middle of the three meninges: The arachnoid membrane is a delicate, web-like membrane that is one of the three layers (meninges) covering the brain and spinal cord. It is situated between the outermost dura mater and the innermost pia mater.

Usage

• The term "arachnoid membrane" is used specifically in anatomical and medical contexts to describe this particular protective layer of the central nervous system.
• It is often referred to simply as the "arachnoid" in professional medical discourse.

Examples

• Noun:
  • A tear in the arachnoid membrane can lead to a cerebrospinal fluid leak.
  • The surgeon carefully dissected through the dura to expose the arachnoid membrane.
  • Inflammation of the arachnoid membrane is known as arachnoiditis.

Advanced Usage

• "Arachnoid" as a standalone noun: In technical writing, the word "arachnoid" is commonly used by itself to mean the arachnoid membrane.
  • The subarachnoid space lies between the arachnoid and the pia mater.

Variants and Related Words

• Arachnoid (noun): A shortened form of "arachnoid membrane."
• Subarachnoid (adj): Located or occurring beneath the arachnoid membrane, typically referring to the space filled with cerebrospinal fluid.
  • A subarachnoid hemorrhage is a serious type of stroke.
• Arachnoiditis (noun): A medical condition characterized by inflammation of the arachnoid membrane.

Synonyms

• Arachnoid (noun): The middle meninx.
• Arachnoidea mater (noun): The full Latin-derived anatomical term.

Notes

• The name "arachnoid" derives from the Greek word for "spider," referring to the membrane's delicate, web-like appearance.
• It is a key anatomical structure in neurology and neurosurgery.

Noun

1. the middle of the 3 meninges