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There are many structures that make up the hair follicle. Anatomically, the triad of hair follicle, sebaceous gland and arrector pili muscle make up the pilosebaceous unit. [1] A hair follicle consists of : The papilla is a large structure at the base of the hair follicle. [4] The papilla is made up mainly of connective tissue and a capillary ...
They can be identified by the fact that they express "hard", "trichocyte" or "hair" keratin proteins. [1] These are modified keratins containing large amounts of the amino acid cysteine , which facilitates chemical cross-linking of these proteins to form the tough material from which hair and nail is composed.
Trichoscopy is a method of hair and scalp evaluation and is used for diagnosing hair and scalp diseases. [1] The method is based on dermoscopy. In trichoscopy hair and scalp structures may be visualized at many-fold magnification. Currently magnifications ranging from 10-fold to 70-fold are most popular in research and clinical practice. [2]
Hair-follicle cycling Hair grows at different speeds and different lengths. Its composition causes different colors and textures, which influence how long the hair strands grow. Marianne Ernst, a German "long hair model" The three stages of hair growth are the anagen, catagen, and telogen phases. Each strand of hair on the human body is at its ...
Trichohyalin is highly expressed in the inner root sheath cells of the hair follicle and medulla. [11] It was also detected in the granular layer and stratum corneum of normal epidermis, [12] newborn human foreskin epidermis, the hard palate, in the nail matrix, the filiform papillae of dorsal tongue epithelium and in rodent forestomach.
Hair follicle with mesenchymal dermal papilla, labelled at top, location of hair follicle stem cells and thought to be site of action of DHT. Type 1 and 2 5α reductase enzymes are present at pilosebaceous units in papillae of individual hair follicles. They catalyse formation of the androgens testosterone and DHT, which in turn regulate hair ...
The original hair type chart, also known as the hair typing system, was created by Andre Walker, Oprah Winfrey's hairstylist, in the 1990s. He debuted the system on Winfrey's show to promote his ...
The key to a natural appearing hair transplant is to have the hair emerge from perfectly normal skin, so minimizing trauma to the scalp is an important aspect of follicular unit transplantation. This can be accomplished by trimming away the excess tissue around the follicular units and then inserting them into small recipient sites on the ...