Blood Supply of the CNS

Question 1

Metabolism in CNS depends almost entirely

upon the

Answer 1

aerobic combustion of glucose

Question 2

Duration of consciousness after
complete cessation of circulation is less
than

Answer 2

10 seconds

Question 3

Estimated cerebral blood flow is about

Answer 3

50ml in 100g of brain per min or 750ml/min

Question 4

Mean oxygen consumption in the normal conscious individual is about

Answer 4

3.3ml per 100g of brain per min or 46 ml/min for the entire brain

Question 5

Brain (2%of BW) requires how much CO2 and O2

Answer 5

17% of CO2 and consumes 20% of the O2 utilized in the body

Question 6

Blood supply of the Spinal Cord comes from

Answer 6

Vertebral arteries

Multiple radicular arteries

Question 7

2 paired descending vessels which provide the principal blood supply of the entire cervical spinal cord.

Answer 7

Vertebral Arteries

Question 8

Supply the posterior 3rdof the spinal cord

Answer 8

Posterior spinal arteries

Question 9

Paired arteries unite to form a single descending midline vessel that supplies midline rami to the lower medulla and sulcal branches that enter the anterior midline fissure of the spinal cord.

Answer 9

Anterior Spinal Artery

Question 10

Provide the principal blood supply of thoracic, lumbar, sacral and coccyceal

Answer 10

Radicular Arteries

Question 11

Derived from segmental vessels ( ascending cervical, deep cervical, intercostal, lumbar & sacral arteries)

Answer 11

Radicular Arteries

Question 12

Accompanies a lower thoracic or upper lumbar spinal root most frequently on the left side

Answer 12

Artery of Adamkiewics

Question 13

Contribute to the anterior spinal artery
Numbers between 6-10:
cervical (0-6);thoracic(2-4); lumbar (1or2)

Answer 13

Anterior Radicular Arteries

Question 14

Divide on the posterolateral surface of the spinal cord and joined the paired posterior spinal arteries
Most consistent on the left side

Answer 14

Posterior Radicular Arteries