,NEUROSURGERY PRACTICE QUESTIONS AND ANSWERS
,Contents
Foreword viii
Preface ix
Questions 1
Answers 167
vii
, Questions
1. Regarding the pathophysiology of myasthenia gravis, what is/are the possible
mechanisms by which acetylcholine receptor antibodies interfere with neuro-
muscular transmission?
A. binding to the acetylcholine receptor and blocking the binding of acetyl-
choline
B. cross-linking acetylcholine receptors, thereby increasing their rate of inter-
nalization
C. binding of complement resulting in destruction of the muscle end plate
D. all of the above
E. none of the above
2. All of the following statements are correct regarding the medial lemniscus
EXCEPT:
A. Near the sensory decussation, its blood supply comes from the anterior
spinal artery.
B. The medial lemniscus can be found in close proximity to the anterolateral
tract in the medulla.
C. Its somatotopy in the pons is such that leg fibers are lateral to arm fibers.
D. The fibers of the medial lemniscus arise from the cuneate and gracile nuclei.
E. Brainstem lesions involving medial lemniscus fibers usually include adjacent
structures, resulting in motor and sensory losses.
1
,Contents
Foreword viii
Preface ix
Questions 1
Answers 167
vii
, Questions
1. Regarding the pathophysiology of myasthenia gravis, what is/are the possible
mechanisms by which acetylcholine receptor antibodies interfere with neuro-
muscular transmission?
A. binding to the acetylcholine receptor and blocking the binding of acetyl-
choline
B. cross-linking acetylcholine receptors, thereby increasing their rate of inter-
nalization
C. binding of complement resulting in destruction of the muscle end plate
D. all of the above
E. none of the above
2. All of the following statements are correct regarding the medial lemniscus
EXCEPT:
A. Near the sensory decussation, its blood supply comes from the anterior
spinal artery.
B. The medial lemniscus can be found in close proximity to the anterolateral
tract in the medulla.
C. Its somatotopy in the pons is such that leg fibers are lateral to arm fibers.
D. The fibers of the medial lemniscus arise from the cuneate and gracile nuclei.
E. Brainstem lesions involving medial lemniscus fibers usually include adjacent
structures, resulting in motor and sensory losses.
1
