Hair Structure

01 May 2018
Hair Structure

Anatomically, hair is a unique section of the skin known as an appendage. Some other skin appendages consist of sweat glands, finger nails and also toe nails. Skin consists of 3 primary layers. The exterior part of skin is the epidermis. This part is no more than a millimeter in thickness and it is consists of dead tissues which are in a continuous condition of sloughing and also replacement. As these dead tissues are shed, fresh ones from the growing part beneath replace them. Under the epidermis is the dermis, a part of connective tissues which is about two to three millimeter thick on the scalp. This particular part provides the skin it is strength, and has each sweat glands and sebaceous glands. Under the dermis is a part of fat along with connective cells.  In the scalp, the bottom parts of the hair follicles are located in the top portion of this fat layer.

A fascinating feature of hair is the fact that, contrary to the general belief that hair grows as unique strands, it really comes out from the scalp in groups of one to four or sometimes even five or six. The reason behind this is that follicles of hair are not solitary body parts, but they are arranged inside the skin in natural groups known as follicular units. Even though skin pathologists identified this fact in the beginning of 1980ʹs, it is serious value in hair transplantation was not valued prior to the mid 1990’s. The application of grafts consists of natural, unique follicular units,

instead of an arbitrary amount of hairs, has modernised hair transplant surgery. Every single hair follicle measures around 3, 4 millimeters in length and also creates a hair shaft around 0.1 millimeter wide.

The hair follicle has 5 major components. The bottom of the follicle, these are: the dermal papillae, matrix, external root sheath "ORS", internal root sheath (IRS), and also the hair shaft, that is the long, visible component. The dermal papillae has specific cells known as fibroblasts which control the hair cycle as well as growth of hair. The dermal papillae has androgen receptors very sensitive to DHT. For several years, researchers believed that hair growth based upon the dermal papillae. Latest data indicates that the growth part extends from the dermal papillae right up to the area of the follicle where sebaceous glands are linked. It is currently considered that the main purpose of the dermal papillae would be to control follicular growth. If the dermal papillae is taken out "this could happen during a hair transplant surgery", the hair follicle is usually capable of create a fresh one.

The matrix is located over the dermal papillae. The matrix and the dermal papillae are known as the hair bulb. The dimensions of the bulb and also the amount of matrix tissues will determine the thickness of the grown hair. Matrix cells distinguish into the 3 primary pieces of the hair follicle: Hair shaft ORS and IRS.

The internal root sheath basically forms a shape for the hair shaft. It is consisting of 3 parts, "Henley, Huxley, and cuticle".

The tissues of the IRS keratinize create hardness and also strength. Racial variants are believed to be because of the asymmetric structure of the IRS. If we look at the cross portion of the IRS, the form is oval in European people, round in Asians and flat in Africans. The hair shaft is the only portion of the hair follicle to exit the skin. The hair shaft is also made up of 3 layers. The cuticle, the exterior layer which interlocks with the inner root sheath, creates the surface of the hair. The center part, the cortex contains the majority of the hair shaft and it gives hair it is strength. It's made up of an organic proteins known as keratin and the core of the hair shaft which known as medulla.

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