Week 1 CNS Objective 5: Cerebral vascular supply

Question 1

Two sources of blood to the brain

Answer 1

1. vertebral
   a. first branch of the subclavian
   b. pass through the foramen magnum
   c. unite at caudal border of pons to form basilar
   artery
   d. basilar artery gives off cerebellar arteries and then
   divides into two posterior cerebral arteries
2. Internal carotid
   a. terminal branches of the common carotids
   b. enter cranial cavity though carotid canal in
   temporal bone

Question 2

Circle of willis

Answer 2

Pentagonal shaped circle of arteries on the ventral surface of the brain that unites the two vertebral and two internal carotids

important anastomose

Question 3

Circle of Willis components

Answer 3

Posterior cerebral arteries (Terminal branches of basilar artery)

Posterior communicating arteries (Connect the posterior cerebral arteries to the internal carotids)

Internal carotids

Anterior carebral arteries

anterior communicating artery (unpaired)