Anatomy of the Meninges Flashcards
what fissure divides the 2 cerbral hemispheres
great longitudinal fissure

where is the tranverse fissure located?
between occiptial lobe and cerebellum

what is the termination of the spinal cord called?
what are the extension the spinal nerves below this level referred to as?
spinal cord- brainstem ——> lumabr vertrbae L1
cons medullaris (L1)
Lumbar, scaral and occygeal spinal nerves extend downwards to leave the verebtral colum—–>cauda equina

what are the 3 layers of thje meninges and what is there function?
dura matter
arachnoid matter
pia matter
(DAP)
function- provide framework for cranila and cerebral vasculature
Protective- from mechanical dmaage help from too CSF
Label this diagram


Describe the Dura matter
- tough, fiborous , vascularised
- loos fititng
- double emembrane in the cranium
- outer periosteal layer (con tinuoius with the periostrum of the outer surfave of the skull
- inner meningeal layer (exits skull to cover tehs pinal cord. SC only has one layer.
what is the extra-dural space?
Potential space between the cranium bone and the dura.
Name the Dural Reflections and what is there function
- Falx cereberi- dural extension within great longitudunal fissure
- Tenotrium cerebelli- tranvers fissure
- Falx cerebelli- btetween cerbellar lobes
- diagrahm sellae- hyposeal fossa
Label this


label this


Describe the arachnoid matter
Describe the pai mater
thin
translucent
tirghtly adherent to surfacve of the brain- follows fyri and sulci
Ppathophysiology of the Dura matter?
raised intracanial pressure- brain can herniate under the Falx cerebri
what are the subarachnoid spaces?
true spaces between the pia and arachnoid matter
filled with CSF and blood vessesl
as the pia is atightly adhered to the brain and the arachoid is loose- region sof subarahcnoid spaces - comparatively lareg called Cistern
what holds the arachnoid and pia matter together?
Trabeculae

Label the following…

superiro cistern
chiasmatic cistern
interpeduncular cistern
pontine cistern
cerebelliomedullary cistern

Describe blood supply the the dura
blood supply travels in the outer periosteal layer
4 major arteries
Anteriro meningeal
middle meningeal (main- branch of the maxillary artery from external carotid)
acessory meningeal artery
Posteriro meningeal artery
where does the middle meningeal artery branch from?
branhc of the Maxillary ateyr from external carotid
Where is the Middle meningeal artery?


Describe innervation of the dura?
tirgeminal nerve CNV
what is the clinical relevance of the meninges?
pathohpysiology and treatment/diagnosios
Meningitis- inflaamtion fot the meninges, can be infective and noninfective
Lumbar punction- removal of CSF from the subarachnoid spaxces for analysis (below L1)
form what space do we take CSF from in a lumbar punction
subarachnoid space
why is the Pterion particular site of weaknes? what kind of intercranila haemohrage might we See?
epidural haemorrhage- pterion is particualr weeks site that converges of the skull bones (frontal patielta, occiptal, sphenoid bome)- overlies the middel meningeal artery
in what groups might we see a subdural haemorrhage
occurs generally due to lower impact truama in indivudals with predisposing factors and is often a venous bleed



















