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Lecture 9 2008 - Anatomy of the Respiratory System Chapter...

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1 Anatomy of the Respiratory System Dr. Phelps Chapter 21 Lecture 9 I. Conducting zone transports air II. Respiratory zone is for gas exchange III. Ventilatory mechanism of respiration IV. Pathological conditions of the respiratory system I. Conducting zone transports air. Organs of conducting system: Nose, nasal cavity, pharynx, larynx, trachea, and bronchial tree Functions of the conducting zone: 1. 2. 3. A. Nose and nasal cavity - Fig. 21.3 1. Boundaries of the nasal cavity Midline: nasal septum Superior: cribriform plate Inferior: hard and soft palate Lateral: 3 conchae, each with meatus below 2. Lining of nasal cavity = respiratory type epithelium contains: Epithelial cells Mucous cells Serous cells Basal lamina Lamina propria Also called pseudostratified ciliated columnar epithelium with mucous secreting cells 3. Extensions of nasal cavity : Fig. 7.11 Paranasal sinuses: 4 pairs of air filled cavities in skull that open into nasal cavity and are lined with respiratory type epithelium Frontal sinus - in frontal bone above eyes Maxillary sinus - in maxillary bone, beneath eyes.
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2 B. Pharynx : 6" skeletal muscle tube connecting nasal cavity and mouth to larynx and esophagus 1 Nasopharynx: serves only for air passage – Fig. 21.3 Posterior to nasal cavity Auditory tube Lined with respiratory type epithelium 2 Oropharynx :
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