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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesMar 112 Organs of the respiratory system nose nasal cavity paranasal sinuses pharynx larynx trachea bronchi alveoli lungs and pleurae The nasal cavity moistens and warms air and houses the olfactory receptors The pharynx is shared by the respiratory and digestive systems and is a passageway for air and food The larynx is the junction between the trachea and esophagus and the vocal cords are located here Cartilaginous components of the external nose The nose is cartilaginous and it has many important functions It provides an airway for respiration it moistens and warms entering air it filters inhaled air to cleanse it of foreign particles it serves as a resonating chamber for speech and it houses the olfactory smell receptors The structures of the nose are divided into the external nose and the internal nasal cavity The external nose consists of the frontal and nasal bones superiorly the maxillary bones laterally and flexible plates of hyaline cartilage inferiorly which are called the lateral septal and alar cartilages The septal cartilage travels down the midline of the nose and divides the external nose into left and right nostrils The entire nasal cavity is divided into two sides On either side of the septal cartilage are the lateral processes of septal cartilage and lateral to these are the minor alar cartilages The tip of the nose is formed by the major alar cartilages The lateral border is the nostril is formed from dense fibrous connective tissue The nasal septum divides the nasal cavity into left and right halves The bony part of the septum is formed by the vomer inferiorly and by the perpendicular plate of the ethmoid bone superiorly The septal cartilage completes the nasal septum anteriorly Limits and lateral walls of the nasal cavity The nasal cavity has anterior and posterior limits a roof a floor and lateral walls The roof is formed by the sphenoid bone and the cribriform plates of the ethmoid bone The floor is formed by the hard palate palatine process of maxillary bone horizontal
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