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Lanugo is very thin, soft, usually unpigmented hair that is sometimes found on the body of a fetus or newborn.It is the first hair to be produced by the fetal hair follicles, and it usually appears around sixteen weeks of gestation and is abundant by week twenty.
Hypertrichosis lanuginosa congenita: lanugo hair growth all over the body, excluding the palms, soles, and mucous membranes, growing up to 3–5 cm. [21] Hypertrichosis congenita terminalis: terminal hair growth all over the body, excluding the palms, soles, and mucous membranes. [22] It is often associated with gingival hyperplasia. [22]
The primary characteristic of all forms of hypertrichosis is excessive hair. Hair in hypertrichosis is usually longer than expected [7] and may consist of any hair type (lanugo, vellus, or terminal). [18] Patterned forms of hypertrichosis cause hair growth in patterns. Generalized forms of hypertrichosis result in hair growth over the entire body.
The hair follicle is an organ found in mammalian skin. [1] It resides in the dermal layer of the skin and is made up of 20 different cell types, each with distinct functions.. The hair follicle regulates hair growth via a complex interaction between hormones, neuropeptides, and immune cells
Vellus hair replaces lanugo hair on a human fetus at 36 to 40 weeks of gestation. [2] The growth cycle of vellus hair is different from the growth cycle of terminal hair. At puberty, androgen hormones cause much of the vellus hair to turn into terminal hair and stimulate the growth of new hair in the armpit and the pubic area. In men, this ...
Some newborns have a fine, downy body hair called lanugo. It may be particularly noticeable on the back, shoulders, forehead, ears and face of premature infants. Lanugo disappears within a few weeks. Infants may be born with full heads of hair; others, particularly Caucasian infants, may have very fine hair or may even be bald. Amongst fair ...
A higher ratio of body surface area (proportional to heat loss) to body volume (proportional to heat production) A higher proportional surface area of the head; A low amount of musculature and the inability to shiver; A lack of thermal insulation, e.g., subcutaneous fat and fine body hair (especially in prematurely born children)
Newborn baby immediately after birth, covered in vernix. Vernix caseosa, also known as vernix, is the waxy white substance found coating the skin of newborn human babies. [1] It is produced by dedicated cells and is thought to have some protective roles during fetal development and for a few hours after birth.
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