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The ventricular system Flashcards

(16 cards)

1
Q

What are the four ventricles that make up the ventricular system?

A

two lateral ventricles, third ventricle and fourth ventricle; these are interconnected by channels and are continuous with the central canal of the spinal cord and the subarachnoid space

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2
Q

What cells line the ventricles- what are the choroid plexuses?

A

ependymal cells- a choroid plexus is a group of specialised ependymal cells within each ventricle that secrete cerebrospinal fluid (CSF)

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3
Q

What is the route of flow in the ventricular system?

A

lateral ventricles -> interventricular foramen -> third ventricle -> cerebral aqueduct -> fourth ventricle -> median and lateral apertures -> subarachnoid space

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4
Q

lateral ventricles

A

largest cavity in the ventricular system

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5
Q

interventricular foramen

A

at the midline of the brain, channels contain choroid plexus

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6
Q

third ventricle

A

in the midline between the left and right lateral ventricles, a median cleft between the 2 thalami

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7
Q

cerebral aqueduct

A

within the midbrain (mesencephalon)- dorsal to the pons and ventral to the cerebellum

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8
Q

fourth ventricle

A

within the pons or in the upper part of the medulla, characteristic diamond-shape in cross sections

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9
Q

How is CSF returned to the venous system?

A

returned via the arachnoid villi- these are sections of arachnoid mater which project into the dural venous sinuses

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10
Q

What are subarachnoid cisterns?

A

around the base of the brain the distance between the arachnoid mater and pia mater is increased in some areas forming subarachnoid cisterns- the cisterns contain greater amounts of CSF, arachnoid trabeculae and some cranial nerve roots

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11
Q

What are the names of the subarachnoid cisterns (5)?

A

interpeduncular cistern, quadrigeminal cistern, chiasmatic cistern, pontocerebellar cistern, cerebellomedullary cistern

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12
Q

Interpeduncular cistern

A

located between the cerebral peduncles of the midbrain

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13
Q

Quadrigeminal cistern

A

located between the posterior part of the corpus callosum and the cerebellum, contains parts of the great cerebral vein and the pineal gland

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14
Q

chiasmatic cistern

A

lies inferior and anterior to the optic chiasma- contains the dessucation of the optic nerve fibres

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15
Q

pontocerebellar cistern

A

lies anterior to the pons

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16
Q

cerebromedullary cistern (cisterna magna)

A

the largest cistern, located between the cerebellum and the medulla