Ventricles and CSF Flashcards by Lola Carthy

what is the floor of the lateral ventricle

thalamus and tail of caudate nucleus

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what is the roof of the lateral ventricle

corpus callosum.

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describe the path of the central canal

it passes from spinal cord to brain stem and opens out into the 4th ventricle

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describe the reabsorption of CSF

CSF is reabsorbed into the venous system by passing into the dural venous sinuses, mainly the superior sagittal sinus.

Arachnoid villi can be found along these sinuses

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describe the path of the cerebral aqueduct

passes throughout the length of the midbrain, beneath the inferior and superior colliculi.

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what is the floor of the inferior horn

the hippocampus

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what is the roof of the inferior horn

tail of the caudate nucleus

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where is the 4th venticle

4th ventricle which lies on the dorsal surface of the brain beneath the cerebellum

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what is the septum pellucidum

sheet spans between the corpus callosum and fornix in the midline and separates the anterior horns of the 2 lateral ventricles.

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why does CSF get reabsorbed into dural venous sinuses

Reabsorption occurs here because the hydrostatic pressure in the subarachnoid space is higher than that in the lumen of the sinus and because of the greater colloid osmotic pressure of blood compared to CSF

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describe the bottom of the 4th ventricle

extends as far as the pontomesencephalic junction where it becomes continuous with the cerebral aqueduct.

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what is the total volume of CSF

usually 135-150ml

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what vesicle is the forth ventricle in

rhombencephalon

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what does high protein levels in CSF indicate

of meningitis and multiple sclerosis

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what is in the diencephalon

thalamus, hypothalamus, epithalamus
most of third ventricle

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how do the 2 lateral ventricles communicate with 3rd ventricle

via the interventricular foramen ( foramen of Monro )

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what are the primary brain vesicles

(prosencephalon, mesencephalon and rhombencephalon)

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what can be identified after week 7 of embryonic development

five secondary brain vesicles are produced by division of prosencephalon (telencephalon, diencephalon) and the rhombencephalon (metencephalon, myelencephalon)

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what are the lateral walls of the 3rd ventricle

thalamus and hypothalamus

what vesicle forms the lateral and third ventricle

prosencephalon

what is in the rostral part of the 3rd ventricle

the interventricular foramen (foramen of monro),

what is the lateral wall of the lateral ventricle

head of the caudate nucleus

what is the function of the interventricular foramen

facilitates communication on either side of the 3rd ventricle with the lateral ventricle in the cerebral hemisphere.

At the rostral margin of the midbrain, the _____________ opens into the 3rd ventricle.

cerebral aqueduct

how does the CSF protext the brain from damage

by buffering

what foramina does the fourth ventricle run through

2 lushka and magendie

what is the roof of the 3rd ventricle

pia-ependyma

where does the ventricular system develop from

the lumen of the neural tube

where does the midbrain arise from

from the second vesicle of the neural tube, the mesencephalon

what facilitates communication between the 3rd and 4th ventricle

the cerebral aqueduct

where is CSF formed

mostly in the choroid plexus of the lateral, third and fourth ventricles or from ependymal cells that line the ventricles

what is a clincal perspective in the ventricles

Hydrocephalus

what can be identified after week 5 of embryonic development

the primary brain vesicles (prosencephalon, mesencephalon and rhombencephalon)

what is in the mesencephalon

brain stem, midbrain and cerebral aqueduct

what is in the metencephalon

brain stem, pons, cerebellum, forth ventricle

what is in the telencephalon

cerebrum, cerebral hemispheres (cortex, white matter, basal nuclei) lateral ventricles and superior portion of third ventricle

where does the forebrain arise from

the prosencephalon

what does the lateral ventricle consist of

an anterior (frontal) horn, body, posterior (occipital) horn and inferior (temporal) horn.

where does the hindbrain arise from

the developing rhombencephalon

where is the the interventricular foramen (foramen of monro),

is located between the column of the fornix and the anterior pole of the thalamus.

how much CSF is produced a day

500ml

what is the function of cerebrospinal fluid

protextion, buoyancy, excretion of waste products and endocrine medium for the brain

what is the medial wall of the lateral ventricle

septum pellucidum

what is in the myelencephalon

brain stem, medulla oblongata and forth ventricle

what forms the roof of the 4th ventricle

the central canal

describe the flow of CSF

- produced by the choroid plexus of the lateral ventricle - flows into the interventricular foramen into the 3rd ventricle. - it enters the 4th ventricle via the cerebral aqueduct - CSF leaves the ventricular system via the 3 apertures of the 4th ventricle and enters the subarachnoid space. - Most CSF enters cisterna magna via the median aperture, but some enters the subarachnoid space via lateral apertures. - From here, CSF flows superiorly around the cerebral hemispheres to the sites of reabsorption.