The nose consists of the nasal bones, the frontal process of the maxilla at the root of the nose, and a number of cartilages. These nasal cartilages are made of hyaline cartilage. These are the lateral nasal cartilages, the greater alar cartilages, and the lesser alar cartilages. The septal cartilage also forms part of these cartilages. The openings of the nose (nostrils) are the external nares (external naris singular).
The nasal cavity has a wall that runs down the middle of it called the nasal septum. The septum consists of three parts, the perpendicular plate of the ethmoid bone (a continuation of the crista galli), the vomer and the septal cartilage. At the end of the nasal septum are two holes that separate the nasal cavity from the nasopharynx. These are the choanae or internal nares. The floor of the nasal cavity is bordered by the hard palate and the soft palate. At the junction of the crista galli and the perpendicular plate of the ethmoid is the cribriform plate of the ethmoid. Label the various structures of the nose such as the bones and color in the cartilages of the nose.
Answer Key: a. Nasal bone, b. Frontal process of maxilla, c. Septal cartilage, d. Lateral nasal cartilage, e. Lesser alar cartilages, f. Greater alar cartilage, g. External naris, h. Crista galli of ethmoid bone, i. Cribriform plate, j. Perpendicular plate of ethmoid bone, k. Vomer, I. Hard palate, m. Soft palate, n. Choanae (internal nares)
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