arachnoid etymology

Etymology:

• Greek "arachne" (spider) + "eidos" (form, shape)

Meaning and Origin:

The term "arachnoid" refers to structures that resemble the web of a spider. It is used to describe various anatomical structures and tissues:

Anatomical Structures:

• Arachnoid membrane: A thin, delicate membrane lining the subarachnoid space in the brain and spinal cord. It is located between the dura mater (outermost membrane) and pia mater (innermost membrane).
• Arachnoid cyst: A fluid-filled sac that forms between the arachnoid membrane and the other meninges.
• Arachnoid granulations: Small, finger-like projections that protrude from the arachnoid membrane into the venous sinuses of the brain. They facilitate the absorption of cerebrospinal fluid from the subarachnoid space.

Tissues:

• Arachnoid tissue: A delicate connective tissue that resembles the web of a spider. It is found in various parts of the body, including:
  • Trabeculae in the spleen
  • Reticular tissue in lymph nodes
  • Endothelium of certain blood vessels

arachnoid relate terms

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