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Flashcards in CNS vasc Deck (46):
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Prior to terminating, however, each ICA gives off a .

posterior communicating artery

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posterior communicating arteries project posteriorly to communicate with the

posterior cerebral artery (PCA).

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two ant cerebral art are connected by an anastomosing branch called the

anterior communicating artery.

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not part of circle of willis

middle cerebral artery

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hip and down provided by 

Anterior cerebral artery (ACA)

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middle cerebral artery 

supply rest of body other than LE

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lenticulostriate arteries

given off by middle cerebral arteries as they course lateral

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frequent site of stroke

lenticulostriate arteries

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internal capsule and deep gray matter

lenticulostriate arteries

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formed by tight junctions between the endothelial cells lining CNS capillaries

Blood Brain Barrier

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limit the flow of substances from capillaries into the CNS

tight junctions of Blood brain barrier

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hydrophilic substances such as amino acids and glucose and medications 

cant cross bbb alone

need carrier

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Lipid soluble molecules, such as ethanol, nicotine and caffeine

cross the BBB,

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Intermediate meningeal layer

Arachnoid

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Conforms to shape of brain …

does not dip into sulci

 Delicate membrane

Arachnoid

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Pia mater

Adheres to the brain, following all of its contours

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Dura mater

External Periosteal Layer

Internal Meningeal Layer

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Internal Meningeal Layer of dura mater

Dense fibrous connective tissue

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External Periosteal Layer

Formed by the periosteum which adheres to the internal surface of skull

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 two largest dural reflections are

Falx cerebri

©Tentorium cerebelli

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invaginates along the longitudinal fissure, between the two cerebral hemispheres

Falx cerebri

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positioned between the occipital and temporal lobes - and- cerebellum

Tentorium cerebelli:

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dural venous sinuses

Dural reflections

receive deoxygenated blood

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conveys deoxygenated blood from cerebral veins to the internal jugular vein

dural venous sinus system

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arrange

venous sinuses --> cerebral arteries capillaries -->internal jugular vein--> cerebral veins

cerebral arteries capillaries --> cerebral veins --> venous sinuses --> internal jugular vein

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diff b/n Cerebral veins and dural venous sinuses

typical venous histology vs. dural spaces lined with endothelial cells

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Potential space between cranium & periosteal layer of dura

Epidural space

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Epidural hemorrhage/ hematoma

Most frequently occurs with trauma/skull fracture

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Epidural hemorrhage/ hematoma

Laceration/ tearing of the meningeal artery and

Bleeding into the potential space between the cranium and periosteal layer of dura

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the periosteal dura encloses the

meningeal vessels.

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subdural space

Potential space between the dura and arachnoid

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Subdural Hemorrhage/ Hematoma

secondary to rapid acceleration/deceleration which pulls the brain away from the skull

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tears cerebral veins as they enter the dural sinus

Subdural Hemorrhage/ Hematoma

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subarachnoid space

true space that contains blood vessels and CSF

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Interventricular Foramen (Foramen of Monroe)

communicates Lateral Ventricles (2) Right Left

to 3rd ventricle

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communication between 3rd and 4th ventricle

Cerebral Aqueduct (Aqueduct of Sylvius)

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Subarachnoid Hemorrhage/ Hematoma

arterial hemorrhage

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Subarachnoid Hemorrhage/ Hematoma

~70% are 2° aneurysm

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Foramen of Magendie

Midline opening in the 4th ventricle

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Foramen of Luschka

Paired openings in the 4th ventricle

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CSF is made in the ------ -------, it circulates through the ---------  and exits the ---- ventricle

 CSF is made in the choroid plexus, it circulates through the ventricles and exits the 4th ventricle

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As CSF leaves the 4th ventricle, it enters the

subarachnoid space.

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CSF travel to subarachnoid space into the dural venous sinuses

via arachnoid granulations

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