piarachnoid


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Related to piarachnoid: pia arachnoid

pia-arachnoid

 [pi″ah-ah-rak´noid]
the pia mater and arachnoid considered together as one functional unit; the leptomeninges.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lep·to·me·ninx

(lep'tō-mē'ninks), [TA]
The two delicate layers of the meninges, the arachnoid mater and pia mater (vs. the tough pachymeninx or dura mater), considered together; by this concept, the arachnoid and pia are two parts of a single layer, much like the parietal and visceral layers of a membrane or bursa; although separated by the subarachnoid space they are connected via the arachnoid trabeculae and become continuous where the nerves and filum terminale exit the subarachnoid space (the cerebrospinal fluid-filled space bounded by the leptomeninges).
See also: arachnoid mater, pia mater.
Farlex Partner Medical Dictionary © Farlex 2012

lep·to·me·nin·ges

(lep'tō-mĕ-nin'jēz) [TA]
The two delicate layers of the meninges, the arachnoid mater and pia mater considered together.
See also: arachnoid, pia mater
Synonym(s): pia-arachnoid, piarachnoid.
[lepto- + G. mēninx, pl. mēninges, membrane]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012