Which vessel system supplies structures in the head, neck, thorax, and abdomen ?
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Answer: C. Vagus nerve
Explanation
The vagus nerve provides parasympathetic and visceral supply to structures throughout head, neck, thorax, abdomen. Extensive branching allows cranial nerve ten to regulate visceral functions across multiple body cavities. Option C is correct because the vagus nerve travels far beyond the head and neck region. Cranial nerve ten is the longest autonomic nerve connecting the brainstem to visceral internal organs. Parasympathetic fibers regulate heart rate, respiratory passages, and gastrointestinal motility throughout the body. Visceral sensory fibers transmit physiological feedback from thoracic and abdominal organs back to brainstem.
Vagal nerve stimulation therapies are utilized clinically to treat severe epilepsy and refractory depression disorders. Surgeries in the neck or chest must protect the recurrent laryngeal branches of the vagus nerve. Autonomic dysfunction involving the vagus nerve can produce widespread gastrointestinal and cardiovascular symptoms. The internal carotid artery supplies oxygenated blood to intracranial structures rather than general viscera. The twelfth cranial nerve is the hypoglossal nerve controlling motor movements of the tongue. The accessory cranial nerve provides motor innervation to sternocleidomastoid and trapezius muscles exclusively.
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Answer: B. Mylohyoid
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Q3. Which muscle of the soft palate receives its motor innervation from the mandibular nerve______________?
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Answer: C. Tensor palati
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Answer: C. Tensor veli palatine
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Q5. At what vertebral level does the trachea divide into the primary bronchi_______________?
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Answer: A. Sternal angle
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