Central Nervous System pt 2

I and II (lateral ventricles)

I and II (lateral ventricles)

located in the cerebral hemispheres

III (third ventricle) 

midline structure in the diencephalon

IV (fourth ventricle)

bounded by the pons, medulla oblongata and cerebellum

Cerebral aqueduct 

• connects the third ventricle to the fourth ventricle and is located in the midbrain
  

• opening from the lateral ventricles to the third ventricle is called the interventricular foramen

choroid plexus

capillary-like structures that continually produce cerebrospinal fluid (CSF)

• where CSF is made

CSF

to serve as a shock absorber, help transport nutrients to cells and to remove products and help maintain the ion balance within the nerve tissue.

meningeal

• brain surrounded by three _ layers but modified somewhat from the make-up of the spinal cord.

• modifications are related to venous drainage of the brain and resorption of CSF

dura mater

in the brain has two layered sheets of fibrous connective tissue

• tough fibrous outermost layer of connective tissue, two layers of dura that separate to form dural venous sinuses 

superficial periostal layer

attaches to internal surface of the skull bone

deeper meningeal layer

form the true external covering of the brain and is continuous with dura mater of the spinal cord

dural sinuses

• wo layers of brain dura are fused together, except when they separate to enclosed a blood-filled _

• sinuses collect the blood to be drained from the brain

superior sagittal sinus

largest dural venous sinus

• on the superior aspect of the brain receives most of the CSF

arachnoid mater

delicate web-like meningeal layer underlies the dura mater

pia mater

delicate vascular membrane adheres to the surface of brain and spinal cord 

arachnoid granulations

on superior part of the brain, the arachnoid mater forms knoblike granulations called _

• CSF is returned to the general venous system through _ projecting into the dural venous sinuses

sub-arachnoid

space deep to the arachnoid mater is called the _ space and contains the cerebrospinal fluid (CSF)

cerebrospinal fluid

surrounds the brain and spinal cord providing nourishment and protection to the central nervous system (CNS)