L2 - Blood supply and Meninges Flashcards
what are the order of meninges from brain towards skull?
(brain) pia arachnoid dura (skull)
which meningeal layer can be described as a tough fibrous membrane?
dura
which meningeal layer can be described as a soft translucent membrane?
arachnoid
where is the subdural space?
space between arachnoid and dura/below the dura (very thin)
falx cerebri and tentorium cerebelli are extensions of which meninges layer?
dura
what is the name of extension of dura matter that forms a partition between the right and left hemispheres?
falx cerebri
which meningeal layer can be described as microscopically thin, delicate membrane?
pia
which meningeal layer is tightly adhered to the surface of the brain, following all cavities?
pia
what is considered a real space? Give examples.
a space that normal exists - subarachnoid space in the skull and spine - epidural space in the spine
what is considered a potential space? Give examples.
not a space - but can become a space in pathological conditions (eg brain bleed) - epidural space in the skull - subdural space in the spine and skull
is the epidural space, real or potential?
potential in the skull real in the spine
what are the real spaces in the skull?
subarachnoid space
what are the real spaces in the spine?
epidural space subarachnoid space
what are the potential spaces in the skull?
epidural space subdural space
what are the potential spaces in the spine?
subdural space
is the subdural space, real or potential?
potential
is the subarachnoid space, real or potential?
real
what is the blood supply of the dura matter?
middle meningeal artery
what are the twi layers if the dura?
outer layer adhered to skull: periosteal inner layer which forms falx cerebral: meningeal
the two layers of the dura matter are tightly fused together except for where?
dural venous sinuses various infoldings
where is the middle meningeal artery? Why is it prone to injury in this position?
- lies below pterion (region where the frontal, parietal, temporal, and sphenoid bones join together. It is located on the side of the skull, just behind the temple.) - most fragile part of the skull and so if it fractures/breaks = middle meningeal artery bleeds
where does venous blood of the brain drain?
into dural sinuses (e.g superior sagittal sinus) and then into the internal jugular vein
where will you find the falx cerebri dural folding?
between cerebral hemispheres
where will you find the tentorium cerebelli dural folding?
between occipital lobes and cerebellum
where will you find the falx cerebelli dural folding?
between cerebellar hemispheres
what is the function of dural infoldings? (e.g falx cerebri)
act as shelves to stabilise brain
where are the venous (dural) sinuses located?
within the dural inholdings
what is the function of the venous (dural) sinuses?
they receive venous blood from the brain and drain into the internal jugular vein
what do superficial veins of the brain drain into?
superior sagittal sinus
what do deep veins of the brain drain into?
internal cerebral veins
what do internal cerebral veins of the brain drain into?
great vein (of Galen)
what does the great vein (of Galen) drain into?
straight sinus
what does the straight sinus and superior sagittal sinus drain into?
confluence of sinuses which drains into the transverse sinuses
what does the transverse sinus drain into?
sigmoid sinus