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The nasolabial folds, commonly known as "smile lines" [1] or "laugh lines", [2] [self-published source] are facial features. They are the two skin folds that run from each side of the nose to the corners of the mouth. They are defined by facial structures that support the buccal fat pad. [3] They separate the cheeks from the upper lip.
Fluctuating asymmetry is the non-systematic variation of individual facial landmarks with respect to the facial midline, i.e., the line perpendicular to the line through the eyes, which crosses the tip of the nose and the chin. A wide variety of methods have been used to examine the claim that facial symmetry plays a role in judgments of beauty.
Marionette lines appear with advancing age, but some people never get them, depending on facial structure and anatomy. They tend to appear as the ligaments around the mouth and chin relax and begin to loosen and sag, and fatty tissues of the cheek deflate and descend during the aging process.
The Buteyko method emphasizes the role of carbon dioxide and hyperventilation in respiratory diseases as well as overall health. It is known that hyperventilation can lead to low carbon dioxide levels in the blood (or hypocapnea), which can subsequently lead to disturbances of the acid-base balance in the blood and lower tissue oxygen levels.
This duality, a sonorant airflow through the nose along with an obstruction in the mouth, means that nasal occlusives behave both like sonorants and like obstruents. For example, nasals tend to pattern with other sonorants such as [r] and [l] , but in many languages, they may develop from or into stops.
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A mouth assessment is performed as part of a patient's health assessment. The mouth is the beginning of the digestive system and a substantial part of the respiratory tract . Before an assessment of the mouth, patient is sometimes advised to remove any dentures.
In the nostrils the mucocutaneous junction has a dense microvascular network, and shows a marked similarity to that found in the mouth, between the oral mucosa and the lips. [ 1 ] At a mucocutaneous junction, epithelium transitions to epidermis , lamina propria transitions to dermis , and smooth muscle transitions to skeletal muscle . [ 2 ]