1 Nasal Septum formed by the following o postero inferior vomer o postero

1 nasal septum formed by the following o postero

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1. Nasal Septum formed by the following: o postero-inferior: vomer o postero-superior: perpendicular plate of the ethmoid o antero-inferior: septal cartilage seldom placed accurately in the median plane but almost invariably bulges or deviates to one or other side (more frequently to the right) covered with yellowish mucous membrane that adheres closely to the sub-adjacent periosteum o mucous membrane over the olfactory area is softer and more delicate, and with very small glands while the mucous membrane in the respiratory area is very thick, spongy, and vascular with numerous large mucous glands Fig 5. Bony and cartilaginous skeleton of nasal septum. 2. Nasal Conchae or Turbinates Fig 6. Sagittal section through the nose, mouth, larynx, and pharynx showing the position of the mirror in posterior rhinoscopy, and structures seen in posterior rhinoscopy.
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S 1 T 20 3 of 6 Nose, Paranasal Sinuses, Pharynx Gross Human Structural Biology 1. Superior Conchae Very short Placed in the upper and posterior part of the lateral wall of the cavity 2. Middle Conchae Much bigger Extends from the posterior part of the nasal cavity to the atrium 3. Inferior Conchae Slightly longer than the middle About midway between the middle conchae and the floor of the nose An independent cranial bone in contrast with the superior and middle nasal conchae, which are parts of the ethmoid bone 3. Nasal Meatuses Spaces in the nasal cavity inferior and lateral to the conchae Consists of superior, middle and inferior nasal meatus 1. Superior Nasal Meatus Short, narrow fissure between the superior and middle conchae Receives opening of the posterior ethmoid sinus into its upper and anterior part 2. Middle Nasal Meatus A roomier space than that of the superior meatus Starting backward from the atrium between the middle and inferior conchae o Atrium located above and slightly behind the vestibule and at the anterior portion of the middle meatus Lateral wall is slightly concave In its upper part, near the nasal bone, is a feeble elevation termed agger nasi, which is an additional concha Upper and anterior parts lead into the infundibulum o Infundibulum is a funnel shape passage through which the frontal sinus communicates with nasal cavity Has a deep group or gutter on the lateral wall called hiatus semilunaris o Hiatus semilunaris begins at the infundibulum and runs from above downward and backward o Has openings of the maxillary air sinus and the anterior ethmoidal air cells At the upper boundary of the hiatus is a prominent bulge called the bulla ethmoidalis o above the bulla ethmoidalis is the aperture of the middle ethmoidal air sinus 3. Inferior Nasal Meatus The horizontal passage that separates the inferior concha from the flow and lateral wall of the nasal cavity The nasal duct opens into its anterior part Fig 7. Lateral wall of the right nasal cavity. Note that the superior, middle, and inferior conchae have been partially removed to show openings of the paranasal sinuses and the nasolacrimal duct into the meati.
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