MUSCLE NERVE CARTILAGE BONE
PERIPHERAL NERVE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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somatic nervous system
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autonomic nervous system
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Either A or B
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None of the above
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Detailed explanation-1: -The vagus nerve, CN X, makes up about 75% of the PNS and provides parasympathetic input to most of the thoracic and abdominal viscera, with the sacral parasympathetic fibers innervating the descending and sigmoid colon and rectum. The vagus nerve has four cell bodies in the medulla oblongata.
Detailed explanation-2: -The term autonomic nervous system (ANS) refers to collections of motor neurons (ganglia) situated in the head, neck, thorax, abdomen, and pelvis, and to the axonal connections of these neurons (Figure 1).
Detailed explanation-3: -The central part of the ANS consists of centers within the brainstem and the spinal cord, while the peripheral part is made up of autonomic fibers and ganglia of the PNS. SNS centers are found within the thoracic and lumbar segments of the spinal cord, which is why it is also called the thoracolumbar division.