CNS protection Flashcards
How do cranium and vertebral column protect the central nervous system
Provide a hard casing around the brain and spinal cord to protect from outside trauma
What are the three portions used in central nervous system protection
The cranium and vertebral column
meninges
astrocytes
What are the three types of meninges
what is the general function of the meninges
Duramater
arachnoid mater
pia mater
Restrict movement within the brain casing
Describe duramater
Thick with lots of collagen and protects the brain in two layers one attaches to the cranium and one attaches to the deeper meninges
Spinal cord only has on layer
Explain the function of Arachnoid mater
Attaches to the Duramater and sends projections into deeper meninges
the space between attachments is called subarachnoid space and is filled with cerebrospinal fluid to prevent and stop movement of the brain
What is pia mater and what functions does it carry out
Thin tightly adhered to the brain and spinal cord
holds blood vessels in place
What do astrocytes do in the protection of the central nervous system
Maintain ion balances and the blood brain barrier
What is cerebrospinal fluid where is it produced and what does it fill
Produced by the choroid plexus which is comprised of empendymal cells and blood vessels it fills brain ventricles and subarachnoid space and runs in the venous system
What are the four ventricles and what order does CSF flow in
Lateral ventricles left and right to
the third ventricle to
the cerebral aqueduct to
the fourth ventricle
What is the order of the sinuses through which drainage occurs in the brain
Begin with superior and inferior sagittal sinuses inferior drains to the straight sinus then meet together with the superior sinus at the confluence of sinuses then to transverse sinuses to sigmoid sinus to internal jugular veins
