1/10/2024 0 Comments Eds table peaks at 1.75 and 8![]() The scalp hair grows ~10 mm/month and its width varies from 50 to 100 μm with an average diameter of 70 μm with its multicellular structure it is essentially made of specific chemical compositions but found variance due to various factors, such as ethnicity, environment, and biological. The outer hair shaft projecting outside the scalp comprised of multiple cellular biological structures composed of cuticle, cortex, and medulla. The hair fiber shaft primarily contains keratins of nearly 18 types of amino acids, water (moisture), lipids (free and structural), trace elements that are generally not free, but combined chemically with side chains of protein groups or fatty acid groups of sorbed or bound lipid and pigments. The human scalp hair fully grown during the embryonic stage is an intricate, biological composite material which has two main parts one under the dermis called follicles and other the hair fiber shaft that extends above the skin surface.
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