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Glabellar lines, commonly referred to as "frown lines" or "11 lines," are the vertical wrinkles that appear between the eyebrows on the forehead. These lines are a natural part of the aging process and are often associated with facial expressions, particularly frowning or squinting. They result from the repeated contraction of the muscles between the eyebrows, causing the skin to crease over time. Glabellar lines develop due to the regular and repetitive movement of the corrugator and procerus muscles.
Forehead lines, also known as "forehead wrinkles" or "worry lines," are horizontal lines that appear on the forehead. Like glabellar lines (between the eyebrows), forehead lines are a common sign of aging and result from a combination of factors, including facial expressions, sun exposure, and the natural aging process. Forehead lines are primarily caused by the repetitive contraction of the frontalis muscle, which is responsible for raising the eyebrows and creating facial expressions such as surprise or curiosity.
Crow's feet, also known as "laughter lines" or "smile lines," refer to the fine lines and wrinkles that radiate outward from the outer corners of the eyes. These lines resemble the feet of a crow when they appear, and they are a common sign of aging. The muscles responsible for the formation of crow's feet are primarily the orbicularis oculi muscles
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