Blood and nerve supply to the nasal septum involves all of the following except_____________?
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Answer: B. Posterior ethmoidal nerve
Explanation
The posterior ethmoidal nerve supplies the cribriform plate and mucosa. It does not provide the primary innervation to the nasal septum area. Other nerves supply the nasal septum while this nerve supplies the roof. The nasal septum is the partition dividing the left and right nasal cavities. Sensory innervation to the nasal cavity is provided by branches of V1 and V2. Ethmoidal nerves originate from the nasociliary branch of the ophthalmic nerve.
Epistaxis often originates from Kiesselbach's plexus on the anterior nasal septum. Rhinitis and septal deviations cause nasal blockage and breathing discomfort. Surgeons must block these sensory nerves during septoplasty surgical procedures. The nasopalatine nerve supplies sensory innervation to the nasal septum mucosa. The pterygopalatine ganglion provides autonomic and sensory fibers to nasal cavity. The nasociliary nerve gives rise to anterior and posterior ethmoidal branches.
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Answer: E. A & B
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Answer: A. Style pharyngeus
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Answer: A. Lower end of cricoid
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Answer: D. Pharyngo esophageal junction
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