Flashcards in Ventricles Deck (22):
1
CSF found in
subarachnoid space
ventricles
2
lateral ventricle
1 in each half of telencephalon
shaped like backward C
anterior horn, body, temporal horn, posterior horn
3
Atrium
point of communication of the horns
4
glomus
large tuft of chord plexus at atrium
can become calcified with age
can be used as radiologic landmark
5
boundaries of lateral ventricle
anterior- genu of corpus callous
rostrum of of corpus callous forms anterior floor
caudate nucleus forms lateral wall
septum pellucidum forms medial wall
6
No direct communication btw
2 lateral ventricles
7
Each lateral ventricle communicates with a 3rd ventricle thorugh
bilateral interventricular foramina (of Monro)
8
3rd ventricle
narrow CSF filled space between right and left half of diencephalon
9
3rd ventricle boundaries
superior- fornix body
tela choroidea
laterally thalamus
and hypothalamus
anterior border- lamina terminalis
10
3rd ventricle communicates with the 4th ventricle via
cerebral aqueduct of sylvius
11
cerebral aqueduct
courses through mesencephalon (midbrain)
ventral-tegmentum
dorsal- tetum
opens into 4th ventricle
12
4th ventricle
dorsal to pons and open medulla
cerebellum forms roof
13
Rhomboid fossa
2 brain stem regions form rhomboid shaped floor of 4th ventricle
14
3 outflow apertures from 4th ventricle that communicates with Cisterna Magna
posterior- foramen of Magendie
laterally - foramina of luschka
15
choroid plexus
highly vascular
produces CSF
formed from tea choroidea
anterior and posterior choroidal arteries
16
CSF composition
watered down
higher Mg and Cl- concentrations
fills ventricles and subarachnoid spaces and cisterns
17
CSF volume
total in brain 125-150 mL
40 ml in ventricles
500-600 ml is formed in 24 hours
18
arachnoid villi
reabsorbs CSF into venous system
mostly in the superior sagittal sinus
passive diffusion
arachnoid granulations
19
CSF function
cushion, buoyant, stable enviornment
50 vs 1500 g
20
communicating hydrocephalis
cerebral ventricles remain in communication with subarachnoid space
21
communicating hydrocephalus
ventricle CSF not able to reach subarachnoid space
22