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23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus

23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus
Transcribed Image Text:23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus
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