NURS 202 Chapter Notes - Chapter 17: Pharynx, Health Promotion, Infant
Document Summary
Jarvis: physical examination & health assessment, 2nd canadian. This section discusses key points about the structure and function of the nose, mouth, and throat. The nose is the first segment of the respiratory system. It warms, moistens, and filters inhaled air and is the sensory organ of smell, innervated by cranial nerve i. o o. Externally, the nose is shaped like a triangle. It consists of a bridge, a tip, two nares, a columella that divides the nares, and two ala (or wings at each side of the nose). Internally, the nasal cavity extends back over the roof of the mouth. Nasal hairs line the cavity"s anterior edge to filter coarse matter from inhaled air. Ciliated mucous membranes line the rest of the cavity and filter dust and bacteria. The nasal mucosa has a rich blood supply, which warms inhaled air and is redder than the oral mucosa. The septum divides the nasal cavity into two air passages.
