8 - Head and neck Grays

8 - Head and neck Grays - The Head and Neck Upper...

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The Head and Neck
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Upper Respiratory Tract Nose Nostril Nasal Cavity Oral Cavity Pharynx pg 992
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Nose Nose is the only portion of the RT that is externally visible CT, bone, hyaline cartilage Air enters here during breathing Passes through the external nares (nostrils) pg 1023
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Vestibule Superior to nostrils Skin lined with: Sebaceous glands Greasy secretion Collect dirt Lubricate Kill bacteria Sweat glands Acidic Slows growth of bacteria Hair follicles Trap small particles of dirt Vibrissae Nose hairs Filter large particles (insects) pg 1013
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Nasal Cavity Functions: Provides airway for respiration Moistens and warms air Filters inhaled air Resonating chamber for speech Houses olfactory receptors 2 divisions: External nose Internal nasal cavity pg 1023
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Nasal Cavity Divided into R and L by nasal septum Continuous with the nasopharynx through the internal nares (choanae) pg 992
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Nasal Cavity Boundries: Roof – ethmoid bone (cribiform plate) Floor – maxilla (palatine process) palatine ( horizontal plate ) Lateral walls – nasal bones, superior and middle nasal conchae of ethmoid bone, inferior nasal conchae, maxilla, palatine bone Hard palate Palatine bones and maxillary bone Soft palate Skeletal muscle posterior portion End in uvula
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Lining of the Nasal Cavity Respiratory Mucosa Pseudostratified ciliated columnar epithelium Goblet cells Lamina propria Mucous and serous cells Venous plexus Function is to filter and warm inhaled air Highly innervated Sneeze! Olfactory Mucosa Roof of nasal cavity Houses smell receptors No goblet cells Cilia modified for olfaction www.mc.vanderbilt.edu/. ../Respiratory03.htm
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Nasal Conchae Project medially from each lateral wall 3 structures: Superior of ethmoid bone Middle of ethmoid bone Inferior Functions: Create turbulence to increase: Filters air Heats air Moistens air Reclaim heat and moisture during exhalation pg 1023
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Paranasal Sinuses Air filled cavities that surround the nasal cavity Lined by mucosa Perform same function as nasal cavity and lightens skull Located in Frontal, Ethmoid, Sphenoid, Maxilla bones pg 1018
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Pharynx Connects the nasal cavity and mouth to larynx and esophagus Extends from base of skull to level of C 6 vertebra Common passage for food and air Lined with skeletal muscle Divided into: Nasopharynx Oropharynx Laryngopharynx pg 992
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Tonsils Lymphoid organ MALT Swellings of the mucosa lining the pharynx Form ring around the entrance to the pharynx 4 groups: Palatine Lingual Pharyngeal Tubal Remove pathogens pg 992
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Nasopharynx Location: Posterior to nasal cavity Inferior to sphenoid bone Superior to level of soft palate ONLY an air passageway Closed off during swallowing by the soft palates’ uvula
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8 - Head and neck Grays - The Head and Neck Upper...

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