Vasculature of the CNS

Question 1

Blood supply to brian:

Answer 1

Anterior circulation: Internal carotid: Supplies the cerebrum

Posterior circulation: Vertebral Artery: supplies Cerebrum, cerebellum, Brain stem and spin cord—– Branches off subclavian, entered transfers process of C6 vertebra

Question 2

Parts of the Anterior circulation of brian:

Answer 2

Cervical-Neck
Petrous- Carotid canal
Cavernous- Siphon
Cerebral- Cerebrum– gives off ant and middle branches

Question 3

Foramen lacerum

Answer 3

Filled with cartilage.

Question 4

Ophthalmic artery:

Answer 4

Off of internal carotid: Branches into central artery of the retina and supraorbital and supratrochlear artery

Question 5

Anterior and Middle cerebral arteries:

Answer 5

Anterior cerebral territory does the anterior aspect Frontal parietal and Medial

Middle cerebral does parts of frontal, parietal and temporal lobes

*MCA= Large # of infarction strokes

Question 6

What forms the Basilar A?

Answer 6

2 (vertebral)? arteries. Pontine arteries branch off of the Basilar A.

Question 7

Vertebral artery

Answer 7

Involved in posterior circulation. Off of subclavian, does significant part of medulla, cerebellum, dura, posterior cranial fossa.

Question 8

Vertebrobasilar Circulation– Basilar:

Answer 8

Pons
Occipital lobe
Temporal lobe
Brainstem
Cerebellum

Question 9

Vertebrobasilar Circulation– Vertebral

Answer 9

Medulla
Cerebellum
Dura of post cranial fossa

Question 10

What is the Circle of Willis

Answer 10

Anastomosis found on inferior aspect of brain connecting anterior and posterior circulation of both hemispheres

Posterior communicating artery connects middle cerebral (IC) and posterior cerebral arteries

Anomalies very common (52%)

Question 11

Spinal cord arteries:

Answer 11

Vertebral branches: Anterior spinal a

Posterior spinal aa.

Question 12

Vasculature of the spinal cord:

Answer 12

Network of vessels that come off and supply spinal cord.

Ant. and post spinal arteries are joined by segmental branches through the intervertebral foramen

Segmental arteries bifurcate into radicular branches that supply the nerve roots

Question 13

Clinical considerations of vasculature of the CNS

Answer 13

Ischemia: Decreased blood deliver

Transient ischemic attack (TIA): Brief reduction in blood flow, Transient neurological signs

Infarction: Tissue death due to long term ischemia

Hemorrhagic stroke: Arterial rupture