exam 4: Meniges (31) Flashcards
Three membranes that line the skull and vertebral canal and enclose the brain and spinal cord
Meninges
label 1-3
- Dura mater
- Arachnoid
- Pia mater
Arachnoid + Pia mater=
Leptomeniges
Cranial dura fused to the periosteum
is there an epidural space within skull
NO
Within the vertebral canal. the dura mater and periosteum are separated leaving a __________________
fat filled epidural space (6) just deep to the yellow ligament
Dura mater: Specialized Folds
Falx cerebri
where does this extend into?
longitudinal cerebral fissure (between cerebral hemispheres)
Dura mater: Specialized Folds
Falx cerebri
what does this contain
dorsal sagittal sinus (collects blood)
identify what the yellow arrow is pointing to
Longitudinal cerebral fissure
identify 1 and 2
- Falx cerebri
2.Corpus callosum
identify
Dura mater
identify
Falx cerebri
Dura mater: Specialized Folds
Tentorium cerebelli (dural and osseous parts)
where does this extend to
Extend into transverse cerebral fissure (between cerebral hemisphere and cerebellus)
Identify
Tentorium cerebelli
identify
Transverse cerebral fissure
identify
- Dorsal sagittal sinus
- Tentorial process-Tentorium cerebelli osseum
identify 1 and 2
- Falx cerebri
- Tentorium cerebelli
what lines the deep surface of the dura mater
Arachnoid
what part of the arachnoid contains the cerebrospinal fluid (CSF)
Arachnoid trabeculae transverse subarachnoid space
what is intimately attaches to the surface of the CNS
pia mater
where does the pia mater extend into
depths of sulci, fissures, crevices
identify
cerebellomedullary cistern (cisterna magna)
identify
Lumbar cistern
What is Myelography
injection of contrast into subarachnoid space
Thickened longitudinal cord of pia on lateral margin of the spinal which segmentally attaches to the dura and arachnoid and thus suspends the spinal cord
denticulate ligaments
what does the denticulate ligaments attach
segmentally attaches to the dura and arachnoid and thus suspends the spinal cord
narrow cord of meninges that attaches conus medularis to the caudal vertebrae
Filum terminale
CSF production:
Choricoid plexus
this is a compact mass of what 3 things
pia, capillaries, and ependymal epithelium
what does the Choricoid plexus produce
CSF by secretion and ultrafiltration from blood
the choroid plexus present in
present within each ventricle (lateral, 3rd and 4th)
identify 1 and 2
- Choroid plexus
2.Ventricles
identify 1 and 2
- Subarachnoid space
- Central canal of spinal cord
identify 1
Mesencephalic aqueduc
how does CSF flow starting at the lateral ventricle
how does CSF flow after it reaches the lateral apertures
what are the green arrows representing
CSF drainage into the vein system
identify 1 and 2
- Arachnoid villi
- Falx cerebri
what is this showing?
what is the cause?
Hydrocephalus; high pressure of CSF in the subarachnoid space due to problems with circulation
what is referred to as the pachymeninx
dura mater
what does the Corpus callosum do
fibers that communicate the right and left hemispheres
identify
Tentorium cerebelli
The subarachnoid space has enlargements that are also called ________________
what is the purpose of these enlargements
cisterns; collection of CSF
There is communication between the 4th ventricle and the _____________ space, allowing for it to be filled with CSF
subarachnoid
the 4th ventricle lives in what 2 areas
pons and medulla oblongata
T/F we are producing CSF all the time
true
what are arachnoid villi
formations that project into the dura mater sinus that filter CSF into the venous system
dura mater sinus joins with ____ and blood gets drains
veins
why does hydrocephalous occur due to increased CSF
the bones of the skull are not formed together so the CSF will flow out and around= creating the enlarged head
