Neuro (2): Ventricles and CSF
central canal
(F) The narrow cavity in the center of the spinal cord that is continuous with 4th ventricle
aqueduct of sylvius
(H) Drainage from 3rd ventricle to 4th ventricle. In midbrain.
cerebral aqueduct
(H) Passageway for CSF between 3rd and 4th ventricle
lateral ventricle parts
- Anterior horn - Body - Posterior horn - Atrium - Inferior horn
cerebrospinal fluid
-CSF serves to support and cushion the CNS against injury. -It may serve nutritive functions and remove metabolic waste products.
four ventricles
1. Right lateral ventricle 2. Left lateral ventricle 3. Third ventricle 4. Fourth ventricle
foramen of luschka
4th ventricle to subarachnoid space. LATERAL
foramen magendie
4th ventricle to subarachnoid space. MEDIAL
choroid plexus
A highly vascular portion of the lining of the ventricles that secretes cerebrospinal fluid.
ventricular system
A system of fluid-filled cavities inside the brain, providing shock absorbency and nutrient exchange between blood vessels and brain tissue.
15-45 mg/dl
CSF protein concentration
CSF flow
Choroid plexus in lateral ventricles --> through interrventricular foramina into third ventricle--> down cerebal aquaduct to 4th ventricle--> out to lateral apertures and one medial apertures--> fills subarachnoid space and bathes external surface of brain and spinal cord--> arachnoid villi, CSF is reabsorbed into venous blood of dural sinuses
half of plasma
Glucose { } of the CSF is roughly _____
thalamus and hypothalamus
Lateral walls of the 3rd ventricle are made up of
types of hydrocephalus
Noncommunicating: obstruction via aqueduct stenosis, fourth ventricular tumor, scarring Communicating: either increased CSF production or decreased absorption
plasma
Salt concentration of CSF is the same as _____
interventricular foramen
The CSF formed in the choroid plexuses of each lateral ventricle flows in the third ventricle through two narrow, oval openings, which are...?
arachnoid granulations
absorb CSF in the mid sagittal sinus
hydrocephalus
an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain
.5ml/min
approximate production rate of CSF
CSF
cerebrospinal fluid
lateral ventricles, atrium, roof of the third ventricle and fourth ventricle
choroid plexus is present in the following
superior sagital sinus
drains most CSF from brain. site with most arachnoid villi. Runs along superior border of falx cerebri.
ependymal cells
in cns only, epithellal cells in a single layer, that line the spaces in the brain and spinal cord, and proudce cerebrospinal fliud (csf)
3-4 times
number of times the CSF is renewed in the human body per day
four
number of ventricles of the brain
fornix
roof of third ventricle
basal hypothalamus
the floor of the third ventricle is formed by...
foramen of Monro
the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere
150 ml
total CSF volume in a healthy adult