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