Question at position 10 In the parasympathetic division of the ANS, preganglionic neurons:Have cell bodies in the brainstem or sacral spinal cord and synapse in terminal or intramural ganglia near the target organExtend directly from the CNS to skeletal musclesHave cell bodies in the thoracolumbar spinal cord and synapse in chain ganglia

Question

BlackTom AI · Accepted Answer

Question restatement: In the parasympathetic division of the ANS, preganglionic neurons:
Options:
1) Have cell bodies in the brainstem or sacral spinal cord and synapse in terminal or intramural ganglia near the target organ
2) Extend directly from the CNS to skeletal muscles
3) Have cell bodies in the thoracolumbar spinal cord and synapse in chain ganglia

Option 1 analysis: This statement correctly describes the parasympathetic preganglionic neurons. Their cell bodies are located in the brainstem (cranial nerves III, VII, IX, X pathways) or in the sacral spinal cord. Their axons project to ganglia that are typically very close to, or within, the target organ (terminal ganglia or intramural ganglia). This arrangement allows for focused, localized control of the organ, with short preganglionic fibers and longer postganglionic fibers to the effector tissues. The use of terminal or intramural ganglia near the target aligns with the classic parasympathetic circuitry.

Option 2 analysis: The claim that parasympathetic preganglionic fibers extend directly from the CNS to skeletal muscles is inaccurate. Direct CNS-to-skeletal muscle innervation is characteristic of the somatic (voluntary) motor system, not the autonomic (involuntary) parasympathetic pathway. Parasympathetic fibers do not target skeletal muscle; skeletal muscle is innervated by motor neurons in the somatic system.

Option 3 analysis: Stating that parasympathetic preganglionic cell bodies reside in the thoracolumbar spinal cord and synapse in chain ganglia is incorrect. The thoracolumbar region and sympathetic chain (paravertebral or prevertebral ganglia) are hallmark features of the sympathetic division. Parasympathetic pathways originate cranially and sacrally, not thoracolumbar, and their ganglia are typically terminal or intramural rather than arranged in a chain.

Additional contextual notes: Understanding the division-specific organization helps distinguish these options. Parasympathetic pathways emphasize localized control via short preganglionic fibers that synapse near or within the target organ, whereas sympathetic pathways generally involve longer pathways to chain or collateral ganglia before reaching targets. The fundamental mismatches in Options 2 and 3 highlight common conceptual errors about autonomic organization.

查看解析

登录即可查看完整答案

类似问题

The largest number of parasympathetic nervous system fibers are contained in which area of the body?

Question at position 39 The pontine storage center facilitates the storage of urine by enhancing Printed Blank[input]Question Blank 1 of 1[input] activity to keep the internal urethral sphincter contracted.parasympatheticsympathetic

Question at position 44 What causes dry mouth during public speaking or stressful events?Dehydration aloneOverproduction of saliva due to anxietyIncreased sympathetic stimulationIncreased parasympathetic activity

The autonomic nervous system:

Question at position 1 The parasympathetic nervous system's effect on the heart would be __________. Select all that apply.Cardiac output would increaseStroke volume would increaseStroke volume would decreaseCardiac output would decreaseHeart rate would increaseHeart rate would decrease

Question at position 12 True or false: Mr. Gomez's HR was elevated due to sympathetic nervous stimulation trying to increase CO.TrueFalse

The autonomic nervous system controls involuntary visceral activities in the body.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单