6 The Ventricular System (Part 2)

cavities (ventricles), ependymal

The ventricular system of the CNS consists of interconnected __________ lined with __________ cells

subarachnoid space

CSF is produced within the ventricles flows towards and fills the _______ _________ before entering the venous system

production and circulation of CSF

What is the main role of the ventricles?

cephalic, neural tube

Ventricles develop from the _________ portions of the _________ _________ in parallel with brain development

lateral ventricles, 3rd ventricle, cerebral aqueduct, 4th ventricle, central canal

What are the five main structural components of the ventricular system?

lateral ventricles

Largest; one in each hemisphere; C-shaped (anterior horn, body, atrium, inferior horn)

3rd Ventricle

Forms the cavity of the diencephalon

interventricular foramen, cerebral aqueduct

The 3rd ventricle communicates rostrally with lateral ventricles (via _________ ________); ventrally with the ________ __________

cerebral aqueduct

Extension of the ventricle through the mesencephalon

3rd ventricle, 4th ventricle

The cerebral aqueduct communicates rostrally with the _______ _________and caudally with the _________ __________

4th ventricle

Rhomboid shaped; forms the cavity of metencephalon and myelencephalon

central canal

A tiny channel found within the spinal cord and inferior medulla oblongata

ependyma

The ventricles of the brain and the central canal of the spinal cord are lined with _________ (one-layer cuboid epithelium)

choroid plexus

modified ependymal cells surrounding a core of capillaries and loose connective tissue

microvilli

Luminal surface of ependymal cells are ciliated with __________

astrocytic processes

The base of ependymal cell is in contact with the subependymal layer of _________ ________

tanycytes, astrocytic, nutrient transport

In some regions, such as the 3rd ventricle, patches of ependymal cells called _________ extend processes through __________ layer to the blood vessels to provide _________ _________

True

T/F: The choroid plexus produces the CSF

vascularized

The choroid plexus is highly _________ projections into the ventricles

lateral ventricle, 3rd ventricle

The choroid plexus extends from the _______ _______ into the atrium and along the floor of the lateral ventricle, attaches to the roof of the _______ ________

foramen of Luschka

In the 4th ventricle, the choroid plexus is attached to the caudal roof and attaches into the ___________ _____ ___________

4th ventricle, subarachnoid space

The foramen of Luschka is an aperture between the _______ _________ and the _________ __________ at the cerebellopontine angle

folds

The choroid plexus has a series of ________ (villi)

Choroid epithelium

a single layer of cuboidal epithelial cells

tight

Cells of choroid plexus are ________ junction-connected

choroid epithelium

Blood filters through fenestrated capillaries across the ________ ________ into ventricles

ions, metabolites

The choroid plexus is specialized to control the flow of ________ and __________ into the CSF

blood-CSF barrier

The choroid plexus represents the ________ __________

slow, pulsating

CSF flow is a _______ _________ movement

lateral ventricles, 3rd ventricle, Cerebral Aqueduct, 4th ventricle, cisterns of subarachnoid space

What is the path of CSF flow?

subarachnoid space, arachnoid granulations

CSF is absorbed from the ________ ________ into the venous drainage through the _________ ________ (superior sagittal sinus)

False (must be precise)

T/F: Production, flow, and absorption of CSF does not have to be in precise balance

hydrocephalus

blockage of the CSF movement or failure of the absorption mechanism that result in CSF accumulation in ventricles

obstructive, communicating

What are the two types of hydrocephalus?

obstrutive

hydrocephalus that is due to blockage of flow of CSF

communicating

hydrocephalus that is due to overproduction or decreased absorption of CSF