NSG 2317 Chapter Notes - Chapter 17: Respiratory Tract, Olfactory Nerve, Pharyngeal Reflex
15 Dec 2016
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Document Summary
The columella divides the two nares and is continuous inside with the nasal septum . The anterior edge of the cavity is lined with many coarse nasal hairs (vibrissae) o the rest is lined with ciliated mucous membranes . O this membrane filters out dust and bacteria . Nasal mucosa appears redder than oral mucosa because of the rich blood supply present to warm the inhaled air. The anterior portion of the nasal septum holds a rich vascular network (common site of nosebleeds) . The lateral walls of each cavity contain 3 parallel bony projections: superior, middle, and inferior turbinates . O they increase the sa so that more blood vessels and mucous membranes are available to warm, humidify, and filter the inhaled air. Underlying each turbinate lies the meatus- sinuses drain into the middle meatus, and tears from the nasolacrimal duct drain into the inferior meatus .
