Topic 19: Nervous System - CNS Protective Features - Bone, Meninges, CFS Flashcards
Name the protective features of the CNS (5)
- bone
- Meninges
- CFS
- Blood brain barrier
- Cerebral Arterial Circle
What bones protect the CNS? (2)
- skull
- vertebral column
What are meninges?
CT around the brain and spinal cord
What are the three layers of meninges?
- Dura Mater (outer)
- arachnoid mater (mid)
- Pia mater (inner)
What are the features of dura mater surrounding the brain? (2)
- 2 fused layers
- separated in some places to form spaces called venous (dural) sinuses that contain blood
What is the dura mater surrounding the spinal cord? layers, deep and superficial (3)
- 1 layer
- deep to dura mater = subdural space, filled with ISF
- superficial to dura mater is epidural space (spinal cord only)
What is the epidural space filled with?
- fat, blood vessels, CT, etc/
Is arachnoid mater vascular or avascular?
- avascular
What does the subarachnoid space contain? (2)
- CSF
- web-like strands of CT secure it to pia mater below
What are arachnoid granulations? (3) ie. location and what goes on in there
- in brain only
- project into dural sinuses
- CSF enters granulations to return to blood
What are characteristics of pia mater? (2)
- on surface of CNS (brain and spinal cord)
- vascular
What is meningitis?
- inflammation of meninges
Where is CSF found? (2)
- surrounds brain and spinal cord
- in brain ventricles and central canal of spinal cord
What are ventricles?
- spaces inside brain (filled with CSF)
Where are all 4 ventricles found?
2 lateral ventricles (1 and 2) in cerebrum
3rd ventricle in diencephalon
4th ventricle surrounded by pons, medulla oblongata, cerebellum
CSF circulation diagram from lateral ventricles
CSF circulation diagram from choroid plexuses
