Leptomeninges
Leptomeninges
Leptomeninges (pronunciation: lep-toh-men-in-jeez) is a term used in the field of neuroanatomy to refer to the two innermost layers of the meninges, the pia mater and the arachnoid mater.
Etymology
The term "leptomeninges" is derived from the Greek words "lepto", meaning thin, and "meninx", meaning membrane. This is in reference to the thin, delicate nature of these two layers of the meninges.
Anatomy
The leptomeninges envelop the entire central nervous system, including the brain and spinal cord. They play a crucial role in protecting these vital structures from injury and providing them with nutrients.
The pia mater is the innermost layer of the leptomeninges, adhering closely to the surface of the brain and spinal cord. It follows the contours of these structures, dipping into the sulci and fissures.
The arachnoid mater is the middle layer of the meninges, lying between the pia mater and the outermost layer, the dura mater. It is separated from the pia mater by the subarachnoid space, which is filled with cerebrospinal fluid.
Related Terms
- Meninges: The three-layered protective covering of the brain and spinal cord, consisting of the dura mater, arachnoid mater, and pia mater.
- Pia Mater: The innermost layer of the meninges, closely adhering to the surface of the brain and spinal cord.
- Arachnoid Mater: The middle layer of the meninges, separated from the pia mater by the subarachnoid space.
- Subarachnoid Space: The space between the pia mater and arachnoid mater, filled with cerebrospinal fluid.
- Cerebrospinal Fluid: The fluid that fills the subarachnoid space, providing cushioning and nutrients to the brain and spinal cord.
External links
- Medical encyclopedia article on Leptomeninges
- Wikipedia's article - Leptomeninges
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