The construction of the hair

The construction of the hair

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The hair consists of three layers: from outside surrounds him the thin theca, the second layer is the central layer , that is to say the bark of the hair, and this third, most internal is the core. The cortical layer of the hair zudowana is grains of the dye, occurrent along of the hair and this just she determines hair colour, of course this natural. An external layer of the hair is the theca, erected from imbricately intruding on himself cells (it reminds the cone). In healthy hair the theca is found on all of their length, instead in hair worn out surrenders the degeneration. Depending on the degree of the destruction of the hair can this be local decreases , until entire of her disappearance. Full-fledged the hair can be divided along on:
· the root of the hair staying in the skin, and exactly in the hair-money-bag
· the stem, called with the stem of the hair
· the end of the hair which is mucronate and appears only in not cut hair
The root is the foot of the hair, being found in the hair-money-bag , ad quem escapes the sebaceous gland. His hard core is the matrix in which are found lively cells of the hair in which happen intensive metabolic processes and the very intensive partition, as result of of which old cells are stuffed upward, what causes their necrosis and the keratinisation. Their place occupy young cells.
The visible part of the hair is the stem, erected from dead cells, is nor nerved, thanks to what the clipping of hair is painful. The interior of the hair is full a keratin, that is to say a rich white into the sulphur. Downtown of the hair is found a core the containing glycogen and rich whites into amino acids.
Every human race differs with the appearance of hair and with their construction, eg. the cross-section of the hair of the white race is circular, instead the yellow race- oval.
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