Meninges

protection of brain

• bone (skull)

• membranes (meninges)

• watery cushion (cerebrospinal fluid)

• blood brain barrier

what is the purpose of meninges

• cover and protect CNS

• protect blood vessels and enclose venous sinuses

• contain CSF

• form partitions in skull

what are the layers of the meninges

• dura mater

• arachnoid mater

• pia mater

meningitis

inflammation of meninges

what is the strongest layer of the meninges

dura mater

what is the dura mater

two layers of fibrous connective tissue around brain separate to form dural venous sinuses

what are the layers of the dura mater

• periosteal layer

• meningeal layer

are the layers of the dura mater fused or separated

fused, but do separate at times

where does deoxygenated blood/veinous blood (jugular vein) that needs to get back to the heart collect

falx cerebri in longitudinal fissure only

identify the dura mater and its layers

answer

dura septa

limits excessive movement of the brain, keeps it where it is at since it is floating (stabilizes and prevents twisting)

what makes up the dura septa

• falx cerebri

• tentorium cerebelli

falx cerebri

in longitudinal fissure; attached to crista galli

tentorium cerebelli

horizontal dural fold over cerebellum and in transverse fissure; shelf between cerebellum and posterior part of brain

identify falx cerebri

answer

identify tentorium cerebelli

answer

arachnoid

middle layer with web-like extensions that is puffed up from the surface of the brain by CSF

what does the subarachnoid space contain

• CSF

• large blood vessels

arachnoid villi

protrude into superior sagittal sinus and permit CSF reabsorption

pia

delicate vascularized connective tissue that clings tightly to brain (adhered to surface, in all cracks and divets)

why his brain hemorrhage bad

puts pressure on brain

types of brain hemorrhage

• epidrual hematoma

• subdural hematoma

• subarachnoid hemorrhage

• intracerebral hemorrhage

epidural hematoma

outside dura; between skull and dura

subdural hematoma

between dura and arachnoid

subarachnoid hemorrhage

between arachnoid and pia

intracerebral hemorrhage

within brain tissue

order of meninges from outside, in

• skull

• dura mater

• arachnoid mater

• pia mater

• brain tissue

identify each type of brain bleed

answer

what type of brain bleed is this

answer

what are the meninges of the spinal cord

• dura mater

• arachnoid mater

• dura mater

what is the epidural space

where the epidural need with med goes

what happens if the epidural goes in too far

it pokes into the dura which results in headaches and CSF leak

identify the meninges of the spinal cord

answers

identify the epidural space

answer

how does a lumbar puncture and an epidural differ when it comes to the layers they are injected into

lumbar puncture penetrates the dura into the subarachoid space whereas the epidural is upon the dura in the epidural space

how does a lumbar puncture and an epidural differ when it comes to the effect/purpose it has

lumbar puncture is a spinal anesthetic that takes a sample of CSF whereas an epidural is anesthesia

which one is the epidural

left