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15 Cards in this Set
- Front
- Back
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Name 3 layers of meninges
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pia mater, dura mater, archnoid
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Pia Mater
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thin membrane covering brain and spinal cord, follows major surface contours, dips into sulci and other depressions, contains small capillaries
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Arachnoid
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spider web like appearance, slightly thicker then pia mater, does not follow contours, bridges over major depressions
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Subarachnoid space
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space between arachnoid and pia mater, contains CSF, reaches its greatest volume near major fissures and depressions, forming cisterns.
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What connects pia mater and arachnoid layer?
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arachnoid trabeculae - thin threads of connective tissue
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Dura Mater
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thickest out of meninges, inelastic connective tissue
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Subdural space
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space between arachnoid and dura mater, small since arachnoid follows dura mater closely
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Name 2 layers of dura mater
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1. periosteal layer - outer layer, adheres closely to the bone
2. meningeal layer - inner layer Normally layers are fused, but at some sites separate to form sinuses (ex. superior saggital sinus) - CSF and blood drain |
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Dural reflections
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at the space where layers separate , meningeal layers fold inward and fuse, function - restricting movement of the brain within the cranium, prevent largest brain structures from impacting each other with blows to the head
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Falx cerebri
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major dural reflection, sickle shaped, divides cortex in hemispheres, continuous with tentorium cerebelli
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Tentorium cerebelli
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forms a tent over cerebellum and brainstem, ensures that blows to the head do not drive cortex into cerebellum and brainstem
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Which layer contains only meningeal and not periosteal layers
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Dura mater of spinal cord
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Denticulate ligaments
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additional support structure in spinal cord, connects pia mater, arachnoid and dura mater
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Epidural space
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space above dura mater in spinal cord, insulates spinal cord
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What is choroid plexus?
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choroid plexus produces CSF, located within lateral,3d and 4th ventricles
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