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Ch. 14 The Brain and Cranial Nerves
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMartini, Nath, Bartholomew 11th EditionCh. 14 The Brain and Cranial NervesProblema 26
Capitolo 14, Problema 26

A cerebrovascular accident occurs when
(a) The reticular activating system fails to function
(b) The prefrontal lobe is damaged
(c) The blood supply to a portion of the brain is cut off
(d) A descending tract in the spinal cord is severed
(e) Brainstem nuclei hypersecrete dopamine

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Step 1: Understand the term 'cerebrovascular accident' (CVA), which is commonly known as a stroke. It involves an interruption of blood flow to a part of the brain.
Step 2: Review each option to see which one describes a condition related to blood flow or vascular issues in the brain.
Step 3: Option (a) mentions the reticular activating system failing, which affects consciousness but is not specifically about blood supply.
Step 4: Option (b) involves damage to the prefrontal lobe, which affects cognitive functions but does not directly describe a vascular event.
Step 5: Option (c) states that the blood supply to a portion of the brain is cut off, which matches the definition of a cerebrovascular accident.

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Cerebrovascular Accident (Stroke)

A cerebrovascular accident, commonly known as a stroke, occurs when the blood supply to a part of the brain is interrupted or reduced, depriving brain tissue of oxygen and nutrients. This can result from a blockage (ischemic stroke) or bleeding (hemorrhagic stroke), leading to brain cell damage or death.
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Blood Supply to the Brain

The brain relies on a continuous supply of oxygenated blood delivered through arteries like the carotid and vertebral arteries. Any disruption in this blood flow, such as a clot or hemorrhage, can cause brain dysfunction or damage, highlighting the importance of vascular health in neurological function.
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Neurological Functions of Brain Regions

Different brain areas have specific roles: the reticular activating system regulates consciousness, the prefrontal lobe manages decision-making, and brainstem nuclei control vital functions. Damage to these areas causes distinct symptoms, but a stroke specifically involves impaired blood flow rather than direct damage to these structures alone.
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Major Regions of the Brain
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