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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 ...
"Hair actively grows during this phase, with cells dividing rapidly at the root of the hair follicle," says Rae Lynne Kinler, MD, a hair transplant surgeon at Ziering Medical. "The hair shaft ...
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 ...
hair follicles visual identification under magnification common worldwide head-to-head contact Body louse – Pediculosis Pediculus humanus humanus: skin visual identification under magnification (Vagabond's disease) common worldwide skin-to-skin contact such as sexual activity and via sharing clothing or bedding Crab louse –Phthiriasis ...
Scalp folliculitis is caused when microorganisms enter the hair follicles through tiny cuts, abrasions, or via the sebaceous glands. Scalp folliculitis can be caused by a few factors, including:
In alopecia areata, a hair follicle is attacked by the immune system. T-cells swarm the roots, killing the follicle. This causes the hair to fall out and parts of the head to become bald. Alopecia areata is thought to be a systemic autoimmune disorder in which the body attacks its own anagen hair follicles and suppresses or stops hair growth. [22]
Nits are tiny, hard and white, and they stick to the hair follicle. Body lice can also transmit pathogens, Frye says, which is particularly a problem for people who have poor hygiene, such as ...
Hair loss may be spread throughout the scalp (diffuse) or at certain spots (focal). The loss may be sudden or gradual with accompanying stress. The most common cause is androgenetic alopecia, also known as male pattern or female pattern hair loss due to the effects of dihydrotestosterone (DHT) on the hair follicles.