BRAIN INJ
Terms
undefined, object
copy deck
- Skull
-
1. Neurocranium 'br box'
2. Facial sk -> bones o nose, mouth orbit - Neurocranium (8 bones)
-
frontal
2 parietal
2 temporal
occipital
sphenoid
ethmoid - MENINGES
-
1)DURA
2)ARACHNOID
3)PIA - DURA
-
thick conn tiss
periosteum of skull - ARACHNOID
-
thin + collagenous
attached to Dura - PIA
-
thin + collagenous
att to CNS - 3 Meningeal Spaces
-
1) EXTRADURAL - btw cr bones + dura (path)
2) EPIDURAL - btwe parietal and meningeal dura (path)
3) SUBARACH - btw arach + pia (true - filled w CSF) - Dural Septa (reflections)
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FALX CEREBRI - sep R+L cerebral hemispheres
TENTORIUM CEREBELI - sep occipital lobe from brstem + cerebellum - Dural Venous Sinuses
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receive all venous drainage of bl:
SUP SAG SINUS
TRNSV SINUSES - Arach Villi
- outpocketing of arach through Venous Sinus
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Blood Source:
MMA
Dural Venous Sinus
Cerebr art/V -
Bleeding/Hematoma:
Epidural
Sub/Epi dural
Subarach hmrrg - Herniations
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from on intracr compart to another bc dura are tough,
but BR SOFT + SQUISHY - Ventricles + communications
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2 lat
(IV foreamen)
3rd V
(cerebral aqueduct)
4th V - Ventricle fn
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make CSF (clear, colourless, low pr)
exits via 3 apetures:
2 lat
1 median - Choroid Plx
-
formed where Ependyma (lines CNS) meets Pia
NO NEURAL TISS INTERFERES
Here, chr epith forms (secretory)
In all 4 ventricles (lat v's make most) - Choroid Epith
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Have tight jns
Secrete CSF - CSF fns
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1. decrease wt of CNS ('CNS floats' in CSF) allowing meninges to supp it
2. Regulates ECF of n's
3. 'Spatial Bufferring'
-br box only allows enter when sthing exits
-each HB pumps bl into br
-CSF sloshes in+out of foramen magnum w each HB