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Blood Supply to the Nervous System

Blood Supply to the Nervous System

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Blood Supply to the Nervous System

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  1. Blood Supplyto the Nervous System

  2. Objectives • 1. Describe the importance of blood circulation to the brain. • 2. List major arteries that transport blood to the cerebrum. • 3. Describe region supplied by each major artery. • 4. Discuss general blood supply for brainstem, cerebellum, and spinal cord. • 5. List common points of anastomoses in the vascular system.

  3. Objectives • 6. Explain significance of potential collateral circulation. • 7. Describe venous-sinus system. • 8. Discuss mechanism of cerebrovascular accidents. • 9. Discuss common cerebrovascular accidents. • 10. Describe the mechanism regulating blood flow. • 11. Discuss the blood-brain barrier and its clinical significance.

  4. Blood Supply • Function: • Total Dependence of Nerve Cells

  5. Oxygen Deprivation Within the Brain • Without Adequate Blood Supply • Irreversible Damage • Site of Lesion

  6. Metabolic Needs of the Brain • Brain’s Metabolic Needs • Blood Flow to the Brain

  7. Drainage of Blood from the Brain • Veins and Sinuses

  8. Vascular Network • Blood Circulation to the Brain

  9. Vascular Network • Large Arteries • Small arteries • Arterioles with small diameters • Capillaries

  10. Cerebral Arteries: Lateral Brain and Cerebellar Surface • Bhatnagar & Andy, 1995, Figure 17.4

  11. Cerebral Arteries: Midsagittal Brain Surface • Bhatnagar & Andy, 1995, Figure 17.3

  12. Vascular Network • Veins • Venules

  13. Cerebral Venous Sinuses • Bhatnagar & Andy, 1995, Figure 17.7

  14. Cerebral Veins: Lateral Surface • Bhatnagar & Andy, 1995, Figure 17.8A

  15. Cerebral Veins: Midsagittal Surface • Bhatnagar & Andy, 1995, Figure 17.8B

  16. Cerebrovascular Supply • Two Arterial Systems:

  17. Cerebral Arteries • Love & Webb, 1996, Figure 3-7

  18. Cerebrovascular Supply: Carotid and Vertebral Basilar Systems • Bhatnagar & Andy, 1995, Figure 17.1A

  19. Cerebrovascular Supply: Circle of Willis • Bhatnagar & Andy, 1995, Figure 17.1B

  20. Cerebrovascular Supply: Cerebral Arterial Structure at Base of Brain • Bhatnagar & Andy, 1995, Figure 17.2

  21. Cerebrovascular Supply: Carotid System • Carotid System

  22. Cerebral Arteries • Love & Webb, 1996, Figure 3-7

  23. Cerebrovascular Supply: Carotid and Vertebral Basilar Systems • Bhatnagar & Andy, 1995, Figure 17.1A

  24. Carotid System • External Carotid Artery and its Branches • Internal Carotid Artery and its Branches

  25. Cerebral Arteries • Love & Webb, 1996, Figure 3-7

  26. Carotid System • Internal Carotid

  27. Cerebrovascular Supply: Carotid and Vertebral Basilar Systems • Bhatnagar & Andy, 1995, Figure 17.1A

  28. Vertebral Basilar System • Two Vertebral Arteries

  29. Cerebral Arteries • Love & Webb, 1996, Figure 3-7

  30. Cerebrovascular Supply: Carotid and Vertebral Basilar Systems • Bhatnagar & Andy, 1995, Figure 17.1A

  31. Cerebrovascular Supply: Circle of Willis • Bhatnagar & Andy, 1995, Figure 17.1B

  32. Cerebrovascular Supply: Cerebral Arterial Structure at Base of Brain • Bhatnagar & Andy, 1995, Figure 17.2

  33. Vertebral Basilar System • Branches

  34. Cerebrovascular Supply: Circle of Willis • Bhatnagar & Andy, 1995, Figure 17.1B

  35. Cerebrovascular Supply: Cerebral Arterial Structure at Base of Brain • Bhatnagar & Andy, 1995, Figure 17.2

  36. Vertebral Basilar System • Posterior Spinal Artery • Function: • Circulatory Disorders

  37. Vertebral Basilar System • Anterior Spinal Artery • Pathway: • Function: • Circulatory Disorders

  38. CorticobulbarTract • Bhatnagar & Andy, 1995, Figure 14.3A

  39. CorticospinalTract • Bhatnagar & Andy, 1995, Figure 14.3B

  40. Vertebral Basilar System • Posterior Inferior Cerebellar Artery • Function:

  41. Vertebral Basilar System • Anterior Inferior Cerebellar Arteries

  42. Vertebral Basilar System • Pontine Level

  43. Cerebrovascular Supply: Circle of Willis • Bhatnagar & Andy, 1995, Figure 17.1B

  44. Vertebral Basilar System • Internal Auditory Artery • Function:

  45. Vertebral Basilar System • Superior Cerebellar Arteries • Pathway: • Function: • Circulatory Disorders:

  46. Circle of Willis • Shape: • Location: • Connections:

  47. Cerebrovascular Supply: Carotid and Vertebral Basilar Systems • Bhatnagar & Andy, 1995, Figure 17.1A

  48. Cerebrovascular Supply: Circle of Willis • Bhatnagar & Andy, 1995, Figure 17.1B

  49. Cerebrovascular Supply: Cerebral Arterial Structure at Base of Brain • Bhatnagar & Andy, 1995, Figure 17.2

  50. Circle of Willis • Components: • Communicating Arteries • 1. • 2. • Proximal Portions of the Cortical Arteries • 1. • 2. • 3.