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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.
Vellus hair is not lanugo hair. Lanugo hair is a much thicker type of hair that normally grows only on fetuses. Vellus hair is differentiated from the more visible terminal or androgenic hair, which develops only during and after puberty, usually to a greater extent on men than it does on women.
Lanugo is a genus of wasps belonging to the family Ichneumonidae. The name refers to the Latin word lanugo , meaning soft, downy hair, due to the hair found on species within this genus. [ 1 ] This genus differs from the otherwise similar genus Compsocryptus by its "moderately short, straight ovipositor rather than a longer upcurved one ...
Vernix is produced during a distinct phase of the epidermal development. [2] Around the 21st week of gestation, periderm cells are being shed and replaced with stratum corneum; these shedding mix with secretions of sebum by the sebaceous glands to form vernix, which gradually covers the body in an anteroposterior and dorsoventral pattern.
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Lanugo covers the entire body. Eyebrows and eyelashes appear. Nails appear on fingers and toes. The fetus is more active with increased muscle development. "Quickening" usually occurs (the mother and others can feel the fetus moving). The fetal heartbeat can be heard with a stethoscope.
Acquired hypertrichosis lanuginosa is characterized by rapid growth of lanugo hair, particularly on the face. [12] [13] Hair also appears on the trunk and armpits, while palms and soles are unaffected. [13] The excess hair is commonly referred to as malignant down. [13] This hair is very fine and unpigmented. [13] Generalized hypertrichosis
Lanugo hair: "fine, non-pigmented hair that covers the normal fetus. It is often several centimeters long. It is often several centimeters long. By the first few weeks of life, lanugo hair should be replaced by velds hair on the body and terminal hair on the scalp."