W20/Neuro peer tute Flashcards
What are the 3 layers of the meninges?
Dura
Arachnoid
Pia
What’s the difference between the cranial and spinal meninges?
The cranial dura mater has 2 layers, while the spinal dura mater is only the layer continuous with the inner cranial dura mater layer
Describe some characteristics of the arachnoid layer
Thin
Avascular
Spiderweb-like in appearance
What is the fancy name for the outer cranial dural layer?
Periosteal layer
What is the fancy name for the inner cranial dural layer?
Meningeal layer
Which layer of the dura mater forms the falces?
The inner (meningeal) layer
What are the 4 falces?
Falx cerebri
Tentorium cerebri
Falx cerebelli
Diaphragma sellae
What are three major types of brain herniations?
Subfalcine (aka cingulate)
Transtentorial (aka uncal)
Tonsillar
Which herniation is the most common
Subfalcine
Which herniation is common in sub-arachnoid bleeds?
Transtentorial
Which herniation is most dangerous?
Tonsillar
How does CSF get back into the venous system?
Via the arachnoid granules (/villi) that project into the sinuses
Which meningeal space has the CSF?
Subarachnoid
Which meningeal spaces are potential spaces only?
Eipdural (except in spine - it’s an actual space)
Subdural
What are the ridges of the cerebrum called?
Gyri
What are the grooves of the cerebrum called?
Sulci
Which fissure divides the L and R cerebral hemispheres?
Superior sagittal fissure
aka longitudinal fissure
Which fissure separates the frontal from the temporal lobe?
Lateral fissure
aka Sylvian fissure
Which fissure separates the frontal and parietal lobes?
Central sulcus
What is the post-central gyrus for?
Sensation
What is the pre-central gyrus for?
Motor control
What is the huge bundle of axons that joins the R and L hemispheres called?
The corpus callosum
What is the Monro Kelly doctrine?
The cranial cavity is a closed box, so its volume is constant, and composed of brain, CSF, blood
What equation illustrates the Monro Kelly doctrine?
Vcc = Vbrain + Vcsf + Vblood
What is normal ICP?
1-15 mmHg
What ICP constitutes a medical emergency?
> 25 mmHg
