ANAT 2626 Chapter 7 - Nose, Nasal Cavity, Paranasal Sinuses and Esophagus (Mercy Navis)

ANAT 2626 Chapter 7 - Nose, Nasal Cavity, Paranasal Sinuses and Esophagus (Mercy Navis)

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1 Chapter # 7 - Pages 955 to 964, 1032 to 1038 Nose 1. part of the respiratory tract superior to the hard palate 2. it contains the peripheral organ of smell 3. it includes the external ear and nasal cavity It is divided into right and left cavities by the nasal septum Each cavity is divisible into an 1. olfactory area 2. respiratory area Functions of the nose and nasal cavity 1. olfaction ( smelling ) 2. respiration ( breathing ) 3. Fltration of dust 4. humidiFcation of the inspired air 5. reception of secretions from the paranasal sinuses and nasolacrimal ducts External nose 1. the visible portion that projects from the face 2. its skeleton is mainly cartilaginous Parts 1. root 2. dorsum 3. ala 4. vestibule ( contains stiff hairs / vibrissae ) Bony part of the nose 1. nasal bones 2. frontal process of maxillae 3. nasal part of the frontal bone 4. nasal spine Nasal septum divides the cavity into right and left halves 1. septal cartilage ( anterior part ) 2. perpendicular plate of ethmoid ( superior part ) 3. vomer ( posterioinferior part ) Nasal cavity 1. nares, are the anterior openings 2. choanae are located posteriorly which communicate with the nasopharynx 3. vestibule lies posterior to the nares, lined with skin 4. olfactory area is the superior one - third, contains the peripheral organs of smell 5. respiratory area is the inferior two - thirds Olfactory cells 1. are in the olfactory epithelium and their central processes of the olfactory cells 2. form the olfactory nerve, I cranial nerve
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2 3. the fbers pass through the cribriForm plate oF ethmoid bone and enter the olfactory bulb Boundaries of the nasal cavity RooF 1. nasal bone 2. Frontal bone 3. ethmoid bone 4. sphenoidal bone ±loor 1. palatine process oF maxilla 2. horizontal plate oF palatine bone ( both Form the hard palate ) Medial wall is the nasal septum Lateral wall by the three nasal conchae, are superior, middle and inFerior Meatuses are the grooves below each conchae, superior, middle and inFerior meatuses Conchae are superior, middle and inFerior, divide the nasal cavity into Four passages 1. sphenoethmoidal recess, receives the opening oF sphenoidal sinus 2. superior meatus, receives the opening oF posterior ethmoidal sinus 3. middle meatus a) ethmoidal inFundibulum, Funnel - shaped opening, communicates with the Frontal sinus b) semilunar hiatus, is a groove into which the Frontal sinus opens
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ANAT 2626 Chapter 7 - Nose, Nasal Cavity, Paranasal Sinuses and Esophagus (Mercy Navis)

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