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Human hair growth
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The growth of human hair occurs everywhere on the external body except for the soles of the feet, the palms of the hands, the lips, the backs of the ears, some external genital areas, the navel, and,
Hair grows at different speeds and different lengths. Its composition causes different colors and textures, which influence how long the hair strands
Hair grows at different speeds and different lengths. Its composition causes different colors and textures, which influence how long the hair strands grow.
Marianne Ernst, a German "long hair model"
Marianne Ernst, a German "long hair model"
Hair
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Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the distinguishing characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in
Human hair growth
…Hair is a stratified squamous keratinized epithelium made of multi-layered flat cells whose rope-like filaments provide structure and strength to the hair shaft. The protein keratin makes up hair and stimulates hair growth. Hair follows a specific growth cycle with three distinct and concurrent phases: anagen…
Scanning electron microscopy image of Merino wool (top) and human hair (bottom) showing keratin scales
Scanning electron microscopy image of Merino wool (top) and human hair (bottom) showing keratin scales
Anatomy of the hair shaft and bulb.
Anatomy of the hair shaft and bulb.
Hair follicle of a Felid.[vague]
Hair follicle of a Felid.[vague]
Human hair contains melanin which provides dark coloration and protection from UV radiation. Human hair can absorb and emit light across a wide range
Human hair contains melanin which provides dark coloration and protection from UV radiation. Human hair can absorb and emit light across a wide range of wavelengths. The image above depicts melanin autofluorescence at 365-400 nm excitation from a strand of dark brown human hair.