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Hair Synthesis

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For hair to grow, there needs to be a hair follicle for the hair to develop out of. The germinating layer of the epidermis (skin) starts to grow down into the dermis and this creates the outside layer of the hair follicle. The dermis then grows and rises into the base if the follicle so that the capillaries can enter the papilla and nourish the hair shaft. The bottom of the hair follicle then enlarges to create the hair bulb. The base of the hair bulb then merges out into the outer root sheath which make the inner walls of the hair follicle, the outer sheath then makes the hair root which then surrounds the dermal papilla.. The outer root sheath then grow is inner root sheath, this is the white bit at end of the hair. The hair root, also known as the …show more content…

This is when different types of hair form. For example oval shaft gives curly hair, where as cylindrical shaft gives us straight hair. By the time they reach three quarters of the way up hair follicle they have died and hardened also referred to as keratinised. There is a sebaceous gland inside each follicle. The gland produces a substance called sebum. There is a bulge below the sebaceous gland on the outer root sheath. This is the point o the arrector pili muscle. The bulge produces stem cells that regenerate the follicle during each hair growth cycle. This muscle is what makes your hair stand on end (goosebumps). With in the shaft of hair there is a Medulla which is like a honeycomb keratin structure. The middle layer is the cortex which gives hair the flexibility and stretching strength to the hair. The melanin granules give the hair its color. The cortex is made of layers of keratin that run parallel to each other along the length of the hair shaft. The outer layer of the shaft called the cuticle is made of 6 to 11 layers of almost transparent keratin scales. This layer makes the hair waterproof. Someone with thick hair will have more of these

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