Brain blood supply
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The document discusses the brain's blood supply system. It is supplied by two main arterial systems: 1. The internal carotid system which supplies the anterior circulation via branches like the anterior and middle cerebral arteries. It connects with the vertebrobasilar system at the Circle of Willis. 2. The vertebrobasilar system arises from the subclavian arteries and supplies the posterior circulation via the basilar and posterior cerebral arteries. Both systems anastomose extensively to ensure redundancy. The Circle of Willis is an important collateral supply and aneurysms commonly form here. Venous drainage occurs via the internal auditory and petrosal sinuses.
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The document summarizes the blood supply of the brain and spinal cord. It discusses the anterior and posterior circulations of the brain, which are supplied by the internal carotid and vertebral arteries respectively. It describes the formation and branches of the circle of Willis. It provides details on the territories supplied by the major cerebral arteries like the middle, anterior, and posterior cerebral arteries. It also discusses the vascular supply of different parts of the brainstem and cerebellum. Finally, it outlines the arterial blood supply of the spinal cord.
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1. The brain receives a significant portion of the body's blood supply and oxygen due to its high metabolic demand, with cerebrovascular diseases and stroke being major causes of death.
2. The internal carotid arteries and vertebral arteries supply blood to the brain, which circulates through the Circle of Willis before branching into further arteries.
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The brain receives its blood supply from two internal carotid arteries and two vertebral arteries. These vessels anastomose to form the circle of Willis at the base of the brain. The internal carotid artery gives off branches that supply the anterior circulation, including the anterior cerebral artery and middle cerebral artery. The vertebral arteries join to form the basilar artery, which supplies the posterior circulation via branches such as the posterior cerebral artery. Various arteries anastomose to provide collateral circulation. Venous drainage involves superficial and deep veins that drain primarily into the dural venous sinuses.
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Brain blood supply
- 1. BRAIN BLOOD SUPPLY Dr. Ghada M. Wageih Audio-vestibular medicine specialist Health insurance
- 3. Aortic ArchBrachiocephalic Trunk R C C A Rt. Subc lavia n A. Rt. L C C A Lt. Subclavian Lt.Vertebral a. Vertebrala. Ant.Spinala.Basilara. PICAPICA AICAAICA Cerebellum Cerebellum Labyrinthine a. Sup. Cerebellar a. Post.Spinala. Post.Spinala. Labyrinthine a. Terminal branches to Mid brain, Temporal lobe, Occipital lobe Sup. Cerebellar a. Pontine a.Pontine a. Arteries to Medulla Oblongata MO a.
- 4. or Basilara. AICA Labyrinthine a. or IAA IAC It irrigates the ganglion cells, nerves, dura, and arachnoid membranes in IAC Ininnerear I. Common Cochlear a. Main cochlear artery supplies Apical ¾ of cochlea Vestibulocochlear artery Posterior Vestibular a. • Inferior part of saccule • Ampulla of PSCC Basal ¼ of cochlea Cochlear Ramus Anterior Vestibular a.II. • Utricle, • Superior part of saccule • Ampullae of ASCC, HSCC.
- 5. Posterior Vestibular a. Cochlear Ramus Main cochlear artery 2. Anterior Vestibular a. Vestibulocochlear artery 1. Common Cochlear a.
- 7. Aortic Arch Brachiocephalic Trunk R C C A Rt. Subcl avian A. L C C A Lt. Subclavian A. ICA Carotid Canal Cavernous Sinus F. Lacerum Ophthalmic a. Central retinal a.Optic canalPost. Communicating a. Ant. Choroidal a. Middle cerebral a. Ant. Cerebral a. (to Frontal lobe & Parietal lobe) Lenticulostriatal a. in lateral Sulcuc (Basal ganglia, corpus striatum, internal capsule, ..) Terminal Cortical Branches for Frontal & Parietal lobes posterior limb of internal capsule, thalamus, and optic chiasm/optic tract
- 8. ACA ICA ACA ICA Basilara. MCA MCA PCA PCA Ant. Communicating a. Ant Choroidal a.Ant Choroidal a. Post. Communicating a. Post. Communicating a. OAOA • Rt. Carotid system + Lt. Carotid system • Carotid system + Vertebro-basilar circulation • Anterior circulation + Posterior circulation Circle of Willis connecting:
- 9. ICA ACA ACA MCAMCA Ant Communicating a. Basilara. ICA Circle of Willis (top view) A unique collateral supply system •COW is the commonest site of aneurysm in our body •Ant communicating a. aneurysm is the commonest in it compress optic chiasma •Post. Communicating a. aneurysm compress 3rd Cr. N.
- 10. Venous drainage Into: 1. Internal Auditory vein, 2. veins of cochlear aqueduct & vestibular aqueduct into Inferior Petrosal & Sigmoid sinuses.
- 11. Thank You