Neuro3 Neurology Circulatory

Question 1

Watershed zones

Answer 1

Between anterior cerebral/middle cerebral, posterior cerebral/middle cerebral arteries. Damage in severe hypotension : upper leg/upper arm weakness, defects in higher-order visual processing.

Question 2

Regulation of cerebral

perfusion

Answer 2

Normally driven by Pco2, but also by Po2 with
severe hypoxia.

Therapeutic hyperventilation (decreases Pco2) helps decrease ICP in cases of acute cerebral edema (stroke, trauma).

Question 3

Circle of Willis Anterior cirulation

Answer 3

derived from internal carotid: ACA, lateral striate, MCA.

Question 4

Circle of Willis Posterior circulation

Answer 4

derived from subclavian: AICA, ASA, basilar, PICA, PCA, vertebral

Question 5

Dural venous sinuses

Answer 5

Venous sinuses run in the dura mater where its meningeal and periosteal layers separate. Cerebral
veins : 7 venous sinuses : 7 internal jugular vein.