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Flashcards in Blood Supply Deck (16):
0

What 2 parts of the brain does the Circle of Willis encircle?

optic chiasm and pituitary gland

1

What two arteries does the Internal Carotid branch off to before joining Circle of Willis?

Opthalmic Artery: Central artery of retina. Occlusion can lead to sudden blindness.

Anterior Choroidal Artery: LGN of thalamus, Internal Capsule, Globus pallidus (also supplied by lenticulostriate arteries of MCA),

2

What is the most common site of aneurysm? Symptom?

Anterior Communicating Artery

Bitemporal hemianopsia (Tunnel Vision)

3

What is the most common artery involved in stroke?

MCA

4

Aneurysms of which arteries can give rise to CNIII palsy?

PCA, SCA, and Post. Comm. Artery

5

What does the PICA supply? Associated defect?

Supplies: medulla and posterior inferior cerebellum
Defect: Lateral Medullary (Wallenburg syndrome). Ipsilateral facial and Contralateral body pain/temp loss, nystagmus, ataxia, vocal cord paralysis, Horner syndrome

6

What does the AICA supply? Associated defect?

Supplies: pons, CN VII, anterior cerebellu,
Defect: lateral pontine syndrome

7

What do the Pontine Arteries supply? Associated defect?

Supplies: pons, corticospinal fibers, CN VI
Defect: "Locked-in syndrome"

8

What does the SCA supply? Associated defect?

Supplies: pons, superior surface of cerebellum, CN VII and VIII
Defect: Aneurysm can compress CN VIII--> dilated pupil on AFFECTED side!

9

What does the PCA supply? Associated defect?

Supplies: Occipital Lobe
Defect: Contralateral homonymous hemianopia with macular sparing. Aneurysm--> CN VIII palsy

10

What does the MCA supply? Associated defect?

Supplies: lateral aspects of hemispheres (trunk-face-upper extremity motor/sensory, Broca, Wernicke)
Defect: Upper branch--> face and arm hemiparesis, hemisensory loss, Broca aphasia. Lower branch--> Wernicke aphasia

11

What does the ACA supply? Associated defect?

Supplies: medial aspect of frontal lobes, lower extremity regions of motor/sensory
Defect: Contralateral lower extremity hemiplegia and/or sensory loss

12

The Dural Venous Sinuses provide path to what?

Provides pathogens an neoplastic cells with valveless path from face through bridging veins to brain

13

What do the Superior cerebral (bridging) veins drain into? What does the Great Cerebral Vein of Galen drain into?

Superior Sagittal Sinus--> confluence of sinuses

Great vein of Galen--> Straight sinus--> confluence of sinuses

Confluence of sinuses--> Transverse--> Internal Jugular vein

14

What is in the Cavernous Sinus? Which CN is most susceptible to impingement?

Surrounds the pituitary gland. Drains blood from face, eye and superficial cortex. Feeds into Jugular Vein.
Contains: CN III, IV, V1, V2, VI, postganglionic fibers that supply orbit. CN VI most susceptible to most medial.

15

What is Cavernous Sinus Syndrome?

opthalmoplegia and facial sensory loss