Flashcards in Protection of the CNS Deck (23):
What is the outer layer of the meninges known as?
What is the innermost layer of the meninges known as?
What is the middle layer of the meninges known as?
What is the subdural space?
The potential space separating the dura and arachnoid maters
What is the subarachnoid space?
The area that separates the arachnoid and the pia mater.
What fluid is contained in the subarachnoid space?
What is the name of the type of fluid found in very small amounts in the subdural space?
Briefly describe the dura mater in relation to the brain.
Two layers of dense fibrous tissue
Outer layer takes place of periosteum on the inner surface of skull and inner layer provides protective covering for the brain.
Where does the spinal dura mater start and end?
Begins at the Foramen Magnum and ends at the 2nd Sacral Vertebrae.
What are the falx's in the brain?
Tentorium cerebelli (Tent of the cerebellum)
Which layer of the cerebral dura mater extends to form the spinal dura mater?
What is the epidural space?
The area which separates the spinal dura mater from the periosteum of the vertebrae and ligaments within the neural canal.
What is contained in the epidural space?
Blood vessels and areolar connective tissue
What attaches the spinal dura mater along it's length
Strands of fibrous tissue attached to the posterior ligament at intervals
What function do the attachments of the spinal dura mater to ligaments along it's length perform?
Stabilises the spinal cord
What tissue makes up the arachnoid mater?
What tissue makes up the pia mater?
Delicate layer of connective tissue containing many blood vessels
What is the filum terminale?
Continuation of the pia mater beyond the spinal cord
Which layers of the meninges fuse with the periosteum of the coccyx?
Dura mater and pia mater
List the components of CSF.
List functions of CSF
1) Maintains uniform pressure around vital structures - cushioning and shock absorbing the brain and spinal cord
2) Keeps Brain and SC moist
3) Thought to be involved in breathing as it bathes the surface of the medulla (site of respiratory chemoreceptors)
What function do choroid plexuses perform?
They secrete CSF into the ventricles of the brain