Components of the Intracranial Vault Flashcards
Blood supply to the brain:
B/L Carotid bodies
B/L Vertebral arteries
The left CA arises from the _____ _____.
Aortic Arch
The right CA arises from the _______ ______.
Innominate Artery
The Internal CA enters the …….
base of the skull.
The External CA remains……..
superficial to the skull
Internal Carotid Arteries (ICA) supplies……….
Arterial supply to the Circle of Willis
Arterial supply of the eye via the ophthalmic artery
Ultimately bifurcates into the anterior and middle cerebral arteries
Circle of Willis
Vertebral
Basilar
Posterior Cerebral
Posterior Communicating
Internal Carotid
Middle Cerebral
Anterior Communicating
Anterior Cerebral
“Very Big Posterior Polyps Invaded My Aching Ass”
______ covers the brain and spinal cord.
Meninges
Meninges consists of ____, ____, and _____.
Dura mater
Arachnoid mater
Pia mater
Where does CSF circulate?
in the subarachnoid space (between arachnoid and pia mater)
The ______ ______ contains the blood supply to the brain
Arachnoid Mater
What layer drains the CSF?
Dura Mater
Dura Mater consists of…..
Consists of an outer (endosteal layer) and an inner (meningeal layer)
Dural sinus are between these layers
Which hematoma has a faster onset of symptoms?
Epidural Hematoma!
Epidural hematoma definition:
Bleeding between the skull and dura mater
Usual arterial in origin (meningeal arteries)
Subdural hematoma definition:
Bleeding between the dura and arachnoid mater
Usually resulting from tears inbridging veins
Subarachnoid hemorrhage definition:
Bleeding between the arachnoid membrane and the pia mater
Usually from a rupturedcerebral aneurysm
The _______ are lined by ependymal cells which help to form the choroid plexus
Ventricles
There are _____ lateral ventricles in the cerebral hemispheres
2
Third ventricle is located in the ________.
diencephalon
Fourth ventricle is located between the _____ and the _______.
pons and cerebellum
CSF site of production:
Choroid Plexus in the cerebral ventricles
CSF: __-__% of intracranial volume
10-15%
Total volume of CSF and how much is produced per 24 hours?
150cc total volume
500cc produced per day
CSF function
“maintains a milieu in which the brain can function by regulating pH and electrolytes, carrying away waste products, and delivering nutrients.”
CSF Flow:
through ventricles –> arachnoid space —> dural sinuses —-> back to circulation
The 2 lateral ventricles are within the ______ ______ and communicate with the third ventricle through the _____ ___ _______.
Cerebral hemispheres
Foramen of Monroe
The third ventricle is inside the substance of the _______, dividing it to 2 lateral parts.
The floor of tis ventricle is the _____ _____.
thalamus
optic chiasm
The fourth ventricle, which communicates with the third ventricle via the ______ ____ ______, lies anterior to the _______and has a connection to the subarachnoid space through the_____ ____ ___ ______ and 2 lateral ____ ___ _______.
-aqueduct of sylvius
-cerebellum
- median foramen of Magendie
-foramen of Luschka
Site of CSF reabsorption:
Arachnoid villi
Pathway between lateral and third ventricle:
Foramen of Monroe
Pathway between third and fourth venticle
Aqueduct of Sylvia’s
