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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.
Facial expression is the motion and positioning of the muscles beneath the skin of the face. These movements convey the emotional state of an individual to observers and are a form of nonverbal communication.
[65] [66] Anatomy advanced further with the invention of the microscope and the study of the cellular structure of tissues and organs. [67] Modern anatomy uses techniques such as magnetic resonance imaging , computed tomography , fluoroscopy and ultrasound imaging to study the body in unprecedented detail.
A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses delight, sociability, happiness, joy, or amusement.
Surface anatomy, or superficial anatomy, is the study of anatomical landmarks that can be identified readily from the contours or other reference points on the surface of the body. [1] It is important in human anatomy: with knowledge of superficial anatomy, physicians gauge the position and anatomy of deeper structures.
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The face is the front of an animal's head that features the eyes, nose and mouth, and through which animals express many of their emotions. [1] [2] The face is crucial for human identity, and damage such as scarring or developmental deformities may affect the psyche adversely.
So we can learn more about a dog’s smile and what it could mean, Juliana DeWillems, the owner and head trainer at JW Dog Training & Behavior, has offered some examples in a recent Instagram post ...