08 26 2014 Meninges and Ventricals Flashcards
Cerebral Spinal fluid
Clear, colorless liquid
140mL
Provides buoyancy, and protects against sudden movements.
Some antibacterial properties
Cisterns
Enlarged areas of subarachnoid space (around brain stem)
- Perimesencephalic cisterns
- Prepontine cistern
- cisterna magna
perimesencephalic cisterns
Interpeduncular cistern (ventral and abovepons)
Quadrigeminal (and ambient) cisterns (between corpus collusum and cerebellum and pons)
Prepontine cistern
ventral to pons (aka in front of pons)
Cisterna magna
below cerebellum
Why do you use a lumbar puncture?
Diagnose subarachnoid hemorrhage and meningitis or introduce drugs.
Adults: L3-L4
Children: L4-L5
What is normal pressure of CSF
< 20 cm H2O
Layers of Dura in Brain vs. spinal cord?
Brain: 2 layers
-periosteal and meningeal – split to form sinuses
Spinal cord : 1 layer – meningeal (vertebrae have their own periosteum)
Layers of Arachnoid in brain vs. spinal cord?
Brain: arachnoid trabecular and many cisterns
Spinal cord: fewer travecule and 1 cistern (lumbar cistern)
- this is where you do lumbar puncture
Layers of Pia in brain vs. spinal cord?
Spinal cord: forms denticulate ligaments and filum terminal
Denticulate Ligament of spinal cord?
anchor pia to dura (from pia to dura)
Filum Terminum of spinal cord?
anchors spinal cord to arachnoid.
Coccygeal ligament (filum terminale externum) of spinal cord?
anchors spinal cord to coccyx
What are the dural folds?
just name them
Invaginations of inner dural layer. Create the supratentorial and infratentorial spaces (in reference to tentorium)
- Flax cerebri
- Falx cerebelli
- Tentorium cerebelli
- Diaphragm sellae
Falx cerebri
in between cerebral hemispheres (in longitudinal fissure)