Word parts
What it means
The brain and spinal cord are wrapped in three layers, the meningesmuh-NIN-jeezThe three thin layers of tissue that cover and protect the brain and spinal cord.mening/o membraneFull entry . The subarachnoid space lies between the middle layer (arachnoid mater) and the inner layer (pia mater) and holds the cerebrospinal fluidser-uh-broh-SPY-nul FLOO-idThe clear, watery fluid that bathes and cushions the brain and spinal cord.cerebr/o brainspin spine-al relating toFull entry that cushions the brain. A lumbar puncture draws fluid from this space in the lower back, and spinal anesthesia is injected into it. Bleeding into it is a subarachnoid hemorrhage.
At a glance
| Spanish | espacio subaracnoideo |
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Related terms
spinal cord
The long bundle of nerves that runs down through the backbone and carries messages between the brain and the body.
cerebrospinal fluid
The clear, watery fluid that bathes and cushions the brain and spinal cord.
lumbar puncture
A procedure in which a needle is put between two bones in the lower back to take out spinal fluid or give medicine; a spinal tap.
meninges
The three thin layers of tissue that cover and protect the brain and spinal cord.