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Archive for the ‘Hair Removal’ Category

the expression of several Hox genes appears to be important in determining the type of epidermal derivative will be formed (eg eyebrow hair in contrast to the fine hair of the cheek).

The first hairs are excelling in the eyebrows shortly after week 16, after a couple of weeks, and cover the scalp. The outbreak follows a gradient capillary cephalocaudal throughout the body.

During the last fasesde the formation of hair, the hair bulb is infiltrated by melanocytes, which determines its color. From the fifth month or so, epidermal stem cells begin to delpelo keratinized and form dense granules that give tricohialina firmly.

Las.glandulas.sebaceas products accumulate on the surface of the skin and vernix caseosa. This substance serves as a protective layer to the epidermis, which is continually exposed to amniotic fluid.

Early fetal hairs called lanugo, are very fine texture and grow close together, are very abundant during the eighth month and are characteristic that emerge shortly antesdel birth and are replaced by definitive hair follicles másgruesos arising from newly formed.

Experiments have shown that the pattern of epidermal derivatives as hair is related to patterns generated in the dermis. Other studies have compared the patterns of scalp hair between normal embryos and embryos with cranial malformations, and have shown a correlation between the eddies and the direction of hair growth and the tension in the epidermis at the time follicles are formed follicles.

The hairs are specialized epidermal derivatives that arise as a result of the inductive stimuli dermis.Hay many types of hair, ranging from thick eyelashes and eyebrows to the nearly invisible Ia abdomen and back.

The underlying dermis determines the regional differences in the morfologla and distribution of the hairs in the epidermis.

The morphogenesis of the hair is first identified about twelve weeks of gestation as downward epidermal projections at intervals with small condensation regularesasociglas skin cells called dermal papillae.

Under the continuing influence of a dermal papilla, the continuing downward epidermal projections in the coming weeks and forms a bulge, in the weeks after the epidermal bulb grows above the dermal papilla and hair begins to mold unfoliculo early.

At this stage the hair follicle is still not exceed the outer surface of the epidermis, but in the portion of the follicle, which penetrates deeply inthe dermis: 1) herald the formation of sebaceous glands that secrete oily skin lubricant (sebum) and 2 ) are the anchor point for the small muscle piloerector.

This is a mesoderm-derived smooth muscle, hair quelevanta up a nearly vertical position when it is cold towards the environment.

Differentiation of a human hair follicle. A. Hair primordia (12 weeks), B. bulbopiloso early (15 to 16 weeks), C. bulbous hair follicle (18 weeks), D. adult hair
More is known about the mechanisms that regulate the formation of feathers on the hair. However, the hair is homologous to the pen, so it is very likely that the fundamental mechanisms that control the formation of the feathers are also applied to the hair.

The first step in the formation of an epidermal derivative, such as hair or feather, is the action of growth factors produced in the mesenchyme specifically bone morphogenetic proteins (BMP) and growth factors in fibroblasts (FCF) on the ectodermosuprayacente , which makes this layer to thicken Paraform one for each hair placode that forms.

The thickened ectoderm placodes then produce signaling molecules-(FGF-2, sonic hedgehog and BMP-2) which in turn makes the underlying mesenchyme condenses (dermal papilla). In different systems under development are homeobox-containing gene, Msx, which are produced at such times and places where cell proliferation is very active.

So the training occurs in cutaneous models derived, the production of Msx by the thickened ectoderm associated with intense proliferation of both the ectoderm and the underlying dermis.

The cuticle

the cuticle is made up of platelet type dandruff. Originate in the hair growth, where newly formed cells in the hair follicle cells deform the cuticle. They push against each other 4 / 5 of its length in the form of shingles and 6-10 layers of cells grouped in rings around the hair.

The cuticle is like a wall for the interior PROTECTIVE hair
the thicker is the hair, the greater the number of layers of cells can be observed. The cuticle serves as a strong protective wall and reserved against water and dirt, for the fiber cells of the cortex that are in the inner bark.

The bark

Most of the hair (approx. 80%) consists of the crust. Only in a cross section of 100-200 are hair cells in the cortex, long and keratinized, oriented parallel to the axis of the hair. The bark. Approximately 80% of hair is composed of the crust.
A thin layer between the cells, the cell membrane complex is responsible for stable attachment. The fiber-shaped cells in turn are composed of tiny fibers extended: macrofibrilas. The macrofibrilas microfibrils are composed of even thinner, to the individual protein keratin, spiral (alpha-helixal structure). They give hair its strength and elasticity.

The bone
Cross section of hair through. Fine hair is composed only of cuticle and cortex cells. The strongest hair can in turn have a third type of cell: the core. This contributes to the brightness of the hair and pigment serves as a reservoir.

Hormonal factors: There are many hormones that influence growth and hair loss, such as the thyroid and pituitary hormones, but are certainly the sex hormones, especially androgens (male sex hormones), which have more influence.

An increase of androgens produces virilization in women and can cause increased hair on the entire body and a decrease in the scalp.

Factors involved in hair growth
Genetic, hereditary or family: The family influence in the distribution, quantity, color and thickness of hair, but there is also a genetic influence on hair disorders, both in increasing as his fall, ie follicles in cycles.

Local factors: Massage, heat, repeated microtrauma in a zone and all situations that locally increased metabolic activity, are factors that favor the rapid growth of hair.

It is difficult to destroy the popular belief, unfounded pathophysiological that shaving increases the rate of growth and hair thickness. It was demonstrated that not shaving or not shaving light, made the hair to grow more intense, yet that still prevails that misconception.

Dietary factors: the growth of hair is essential to a proper supply of amino acids and vitamins, mainly.

Autoimmune factors: it is common that the body responds with alopecia called “areata” to situations of stress, anxiety, etc…

The growth of the hair and inner root sheath occurs by mitotic activity in the bulb matrix, so that the inner root sheath moves up through the follicle, with the hair.

At the level of the sebaceous gland is removed the inner root sheath, while hair continues to the free surface.

Hair growth is discontinuous, since hair is lost and is replaced by a new one.

It is considered that the growing follicle is described anógeno, ending with a short transition or catagen, after which the hair goes to sleep or teltigeno stadium.

During the catagen is interrupted division of matrix cells and hair ends to differentiate and keratinized, with simultaneous transformation into a mass bulb attached to the hair, “hair club”, surrounded by cells of the outer root sheath extending a depth hebrahacia atrophic papilla.

The mace is separated and rises to a level opposite the mouth of the sebaceous glands, where he remained some time.

Finally drop the “hair club” or is eliminated by the new hair. Undifferentiated cells that come from the outer root sheath give rise to a new hair that begins to form near the old disc.

Schematic drawings of human hair in various stages of growth

in humans there are continuous renovacidón hair, because the cycle of growth of each follicle passes independently of neighboring follicles cycle.

The natural length of hair depends on the duration of growth, hair, is several years, while for eyebrows and eyelashes is only a few months. Average growth per day is about 0.35 mm, and cutting or shaving does not affect it.

the look of the bride everything is measured in detail. If in your mind you see a particular hairstyle, you have to get it, even if you miss long hair or do not have too much volume. With some extensions can work the miracle that yes, put them up for?

Sometimes the preparations for the wedding was so focused on the “day” that we do not realize that there is life after the event itself. By this I mean that, for example, think that often the honeymoon set in exotic destinations or frenetic cities probably will not find time to quietly, hydrate and detangle. In addition, tropical humidity and heat can embitter the trip because of some extensions that are virtually dreadlocks.

Advantages of the extensions for the bride

they provide extra volume if you want to make a special collection, for example, a top knot or braid romantic. They allow you to look melenón on a special day. If you like curly hair, are a major plus for the cascade of curls, otherwise, may be poor.

Drawbacks

they are expensive, require a follow-up care to keep well and should put them in a good site to ensure it is the right tone and subject perfectly. A large fixed alterntiva to extensions are hairpieces hair-do. In one piece and the Clip-In, you can put yourself and remove the remaining perfect and invisible. And thanks especially to natural tones, perfect harmony with one’s hair. You can get curls or smooth hair, layers, volume … at one time. Do you dare?

If you usually wear a mask for your hair, but do not know if you’re taking full advantage and use as you should.

* Apply the mask on your hair and dry with a towel and after the implementation, roll on his head a wet towel in hot water. Leave five to ten minutes and rinse with cold water. The result is spectacular.

And

* If your hair is long, the mask must be applied from the ends toward the middle of the hair. However, if the hair is short, the product will only apply at the tips. In both cases it is important to keep the mask in contact with the root.

* Frequency of use depends on the health of hair, but it is recommended to begin treatment using two to three times a week and then once a week.

* Always let the product work for at least 3 minutes.

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