Term
|
Definition
A: Anterior cerebral
B: Anterior communicating
C: Anterior cerebral
D: Middle cerebral
E: Posterior communicating
F: Posterior cerebral
G: Basilar
H: Frontal lobe
I: Temporal lobe
J: Cerebellum |
|
|
Term
| How is cerebral blood flow controlled locally? |
|
Definition
1) Metabolic hyperaemia
2) Functional hyperaemia
3) Hypoxemic vasodilation. |
|
|
Term
| What is metabolic hyperaemia? |
|
Definition
| An increase in metabolism products (H+ & adenosine) causes an increased diameter of blood vessels to transport them away. |
|
|
Term
| What is functional hyperaemia? |
|
Definition
| Increased neuronal activity produces focal vasodialtion due to an increase in K+, H+ and adenosine. |
|
|
Term
| What is hypoxemic vasocilation? |
|
Definition
| Decreased O2 conc. (<50mm Hg) causes increased blood flow. |
|
|
Term
| What is the range of cerebral blood flow autoregulation? |
|
Definition
|
|
Term
| Describe the 2 factors which autoregulation depends upon. |
|
Definition
1) Myogenic and metabolic
2) Increased BP stretches smooth muscle and decreases metabolites. This causes vasoconstriction of smooth muscle and increased resistance to blood flow. |
|
|
Term
| What is the effect of chronic hypertension on autoregulation of CBF? |
|
Definition
| Shifts the autoregulatory range to the right (higher pressures). |
|
|
Term
| What is the most important factor in increasing CBF? |
|
Definition
|
|
Term
|
Definition
A: Sagittal sinus
B: Cerebral vein
C: Dura mater
D: Arachnoid mater
E: Pia mater
F: Subarachnoid space |
|
|
Term
| Name the 4 types of cranial haemorrhage. |
|
Definition
1) Subdural
2) Subarachnoid
3) Intracerebral
4) Extradural |
|
|
Term
| What does a stroke in the brainstem cause? |
|
Definition
|
|
