Meninges and Ventricles Flashcards
Via what structure does blood supply leave the brain?
Internal Jugular Vein
What forms venous sinuses?
dura mater
TRUE or FALSE: bridging veins do not penetrate dura mater.
FALSE –> bridging veins penetrate the dura
Where are bridging veins found?
in arachnoid mater
Do superior cerebral veins pierce the arachnoid mater?
yes
Where do superior cerebral veins drain into?
superior sagittal sinus or lacunae
What are the different routes of drainage from the superficial middle cerebral vein?
- to cavernous sinus
- to superior anastomotic vein –> superior sagittal sinus
- to inferior anastomotic vein –> transverse sinus
What kind of brain bleed occurs when the middle meningial artery ruptures? Where does the brain bleed occur?
epidural hematoma; epidural space (between calvaria and dura mater)
Where would a subdural bleed occur?
below dura mater and above arachnoid mater
What kind of brain bleed occurs when bridging veins rupture?
subdural hematoma
Which of the following is/are potential space(s)?
a) epidural space
b) subarachnoid space
c) subdural space
a) epidural space
c) subdural space
TRUE or FALSE: pia mater extends into sulci
TRUE
Where is cerebrospinal fluid produced in the brain?
ventricles
What is another name for the interventricular foramen?
Foramen of Monro
What is another name for the cerebral aqueduct?
Aqueduct of Sylvius
What ventricles does the cerebral aqueduct connect?
third ventricle and fourth ventricle
Describe the path of CSF from when it is secreted and how it cushions the CNS.
CSF excreted from choroid plexus into VENTRICLES where it flows through the SUBARACHNOID SPACE (to cushion CSF)
What must the CSF flow through from the ventricles in order to reach the subarachnoid space?
lateral and median apertures
TRUE or FALSE: most of the CSF resides inside the ventricles.
FALSE –> most of the CSF resides OUTSIDE of the ventricles
Where does CNS drain into (from the subarachnoid space and ventricles)?
dural sinus
Where does CNS drain into (from the subarachnoid space and ventricles)?
dural sinus
What structures allow CSF to drain from the subarachnoid space into the superior sagittal sinus?
arachnoid granulations
What are the functions of the arachnoid trabeculae?
- help keep brain suspended within the meninges
- maintain space between pia mater and arachnoid mater
Describe the path of CSF drainage starting from the subarachnoid space.
subarachnoid space –> superior sagittal sinus –> confluence of sinuses –> transverse sinus –> sigmoid sinus –> internal jugular vein –> heart
What is hydrocephaly?
accumulation of CSF in the brain
What are the 2 different types of hydrocephaly and what is the difference?
communicating: outside the ventricular system, obstruction at cisterns or arachnoid villi
noncommunicating: within the ventricular system
How does communicating hydrocephalus occur?
fluid reabsorption system fails and ventricles begin to enlarge
How does noncommunicating hydrocephalus occur?
ventricles become blocked by obstructions (e.g. tumor, cyst, scarring)
What is another name for noncommunicating hydrocephaly?
obstructive hydrocephaly
