venous blood supply

Question 1

what sinuses are along the venous system?

Answer 1

dorsal sagittal
temporal
dorsal petrosal
middle meningeal

Question 2

what do the sinuses do?

Answer 2

• pool blood
• the point where the exchange between CSF & the venous system occurs

Question 3

why might pooling blood (due to sinuses) be a bad thing?

Answer 3

blood clotting

Question 4

what is the blood brain barrier (BBB)?

Answer 4

a physical barrier between the systemic circulatory system and nervous secretary system

Question 5

which cell facilitates the BBB?

Answer 5

astrocytes

Question 6

what do astrocytes do?

Answer 6

form a layer around the blood vessels & controls exchange

Question 7

what methods can be used to cross the BBB?

Answer 7

lipophilia (lipophilic) - can diffuse rapidly across lipid membrane
ions - pumped across
specified transporter - glucose & amino acids
receptors
plasma proteins - absorptive
cell-mediated