A previously healthy 20-year-old man comes to the physician because of a 1-week history of progressive weakness in his arms and legs and tingling in his toes and fingertips. He also has difficulty drinking with a straw. Mental status examination shows no abnormalities. Physical examination shows prominent facial weakness. He unable to puff out his cheeks. Ocular motions are normal. He is barely able to lift his arms above his head and is unable to rise from a chair without pushing with his arms on the armrests. Vibratory perception in his feet is decreased. Muscle stretch reflexes are absent. Plantar responses are flexor bilaterally. Which of the following portions of the motor system is most likely damaged in this patient? A) Lower motoneurons B) Neuromuscular junctions C) Peripheral nerves D) Skeletal muscles E) Upper motoneurons

A previously healthy 20-year-old man comes to the physician because of a 1-week history of progressive weakness in his arms and legs and tingling in his toes and fingertips. He also has difficulty drinking with a straw. Mental status examination shows no abnormalities. Physical examination shows prominent facial weakness. He unable to puff out his cheeks. Ocular motions are normal. He is barely able to lift his arms above his head and is unable to rise from a chair without pushing with his arms on the armrests. Vibratory perception in his feet is decreased. Muscle stretch reflexes are absent. Plantar responses are flexor bilaterally. Which of the following portions of the motor system is most likely damaged in this patient? A) Lower motoneurons B) Neuromuscular junctions C) Peripheral nerves D) Skeletal muscles E) Upper motoneurons

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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