L7 Ventricles, CSF, Veins and Sinuses Flashcards
what is hydrocephalus?
dilation of cerebral ventricles
what ventricle splits the diencephalon into halves?
the 3rd ventricle
what is a common site for obstructive hydrocephalus?
cerebral aqueduct
where is the foramen of Lushka found?
junction of the medulla and pons
how do the ventricles communicate with the subarachnoid space?
foramen of lushka and foramen of magendi
where is there no choroid plexus?
cerebral aqueduct
what are the functions of CSF
- bouyancy
- shock absorption
- chemical stability
- reduction of ischemia - balance pressure/blood
what produces CSF?
choroid plexus
ependymal
glia
pial and arachnoid vessels
how are ions and water transported from CSF?
ions actively transported
water passively transported
what is CSF low in
glucose protein K+ calcium and cellular content
what is CSF high in?
Na
Cl
Mg
*normal ranges of Na in CSF and serum largely overlap
is the BBB continuous with hte spinal cord?
yes
what does the subfornical organ do?
thirst regulation
water balance
can communicate to retain salt
behavior - get up and get a drink etc.
what does the organum vasculorum of the lamina terminalis do?
fluid and electrolyte balance
what does the neuro hypophysis do
part of pituitary system
output pathway wants to put stuff into blood
can signal vascular system to add anti-direuetic hormone into blood and have impact on kidney
what does the median eminence of the 3rd ventricle do?
hypophyiotropic hormones converge before they are conveyed into the pituitary gland
what is the area postrema?
body fluid homeostasis and emetic phys.
causing vomting even beyond when its useful
posions act on area postrema
what does the subcommissural organ do?
secrete various glycoproteins into CSF - maybe somatostatin
what does the pineal gland do?
mediate circadian rhythm - melatonin
what is a symptoms of obstructive hydrocephalus?
sunset gaze - eye balls point down
brain damage and pushes down in structures that raise eyeballs up.
