edson sospeter
Nov 12, 2023
How blood supply occurs in the brain??
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Nov 12, 2023
Blood supply to the brain is crucial for its proper functioning. It is supplied by two pairs of arteries: the internal carotid arteries and the vertebral arteries.
The internal carotid arteries supply the anterior portion of the brain. They arise from the common carotid arteries in the neck and enter the skull through small openings called the carotid canals. These arteries then divide into two main branches: the anterior cerebral arteries and the middle cerebral arteries. The anterior cerebral arteries supply the frontal lobes and the medial surfaces of the brain, while the middle cerebral arteries supply the lateral surfaces of the brain, including the temporal and parietal lobes.
The vertebral arteries supply the posterior portion of the brain. They arise from the subclavian arteries in the neck and enter the skull through the foramen magnum. The two vertebral arteries merge at the base of the brain to form the basilar artery, which then divides into smaller branches to supply the brainstem, cerebellum, and the posterior part of the cerebral hemispheres.
These arteries give rise to a network of smaller blood vessels called arterioles, which further branch out into even smaller vessels called capillaries. Capillaries are responsible for delivering oxygen and nutrients to the brain cells and removing waste products. The capillaries then converge to form venules, which eventually join to form larger veins that carry deoxygenated blood back to the heart.
The brain also has a unique system called the Circle of Willis, which is a circular network of arteries located at the base of the brain. This network provides collateral circulation, allowing blood to flow to different regions of the brain even if one of the major arteries becomes blocked.
Overall, the blood supply to the brain is a complex and highly regulated process, ensuring that the brain receives a constant supply of oxygen and nutrients for its proper functioning.
The internal carotid arteries supply the anterior portion of the brain. They arise from the common carotid arteries in the neck and enter the skull through small openings called the carotid canals. These arteries then divide into two main branches: the anterior cerebral arteries and the middle cerebral arteries. The anterior cerebral arteries supply the frontal lobes and the medial surfaces of the brain, while the middle cerebral arteries supply the lateral surfaces of the brain, including the temporal and parietal lobes.
The vertebral arteries supply the posterior portion of the brain. They arise from the subclavian arteries in the neck and enter the skull through the foramen magnum. The two vertebral arteries merge at the base of the brain to form the basilar artery, which then divides into smaller branches to supply the brainstem, cerebellum, and the posterior part of the cerebral hemispheres.
These arteries give rise to a network of smaller blood vessels called arterioles, which further branch out into even smaller vessels called capillaries. Capillaries are responsible for delivering oxygen and nutrients to the brain cells and removing waste products. The capillaries then converge to form venules, which eventually join to form larger veins that carry deoxygenated blood back to the heart.
The brain also has a unique system called the Circle of Willis, which is a circular network of arteries located at the base of the brain. This network provides collateral circulation, allowing blood to flow to different regions of the brain even if one of the major arteries becomes blocked.
Overall, the blood supply to the brain is a complex and highly regulated process, ensuring that the brain receives a constant supply of oxygen and nutrients for its proper functioning.
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