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Lanugo
Lanugo is fine, downy hair; it is a type of pelage.
In humans
Fetal development
Lanugo grows on fetuses as a normal part of gestation, but is usually shed and replaced by vellus hair at about 40 weeks of gestational age. As the lanugo is shed from the skin, it is normal for the developing fetus to consume the hair with the fluid, since it drinks from the amniotic sac|amniotic fluid and urinates it back into its environment. Subsequently, the lanugo contributes to the newborn baby's meconium. The presence of lanugo in newborns is a sign of premature birth.
Malnutrition
Lanugo is also a common symptom of serious anorexia nervosa, as the body attempts to insulate itself when body fat is lost.[Mori J. Krantz & Philip S. Mehler. Resting tachycardia, a warning sign in anorexia nervosa: case report. BMC Cardiovascular Disorders, 2004 4:10.] Lanugo may also occur in individuals who are malnourished due to lack of access to adequate food.
In non-human animals
Lanugo is also common on other animals. For example, seals[''Growth and Development of Mediterranean Monk Seal Pups during Rehabilitation'', E. Androukaki, E. Fatsea, L. 't Hart, A.D.M.E. Osterhaus, E. Tounta, S. Kotomatas, Monachus Science Posters, The Monachus Guardian, Vol. 5 (1): May 2002, This poster was presented at the 16th ECS (European Cetacean Society) Conference, "Marine Mammal Health: from Individuals to Populations", 7 April–11 April 2002, Liege, Belgium.] and elephants[''Ecology of the Asian Elephant in Lowland Dry Zone Habitats of the Mahaweli River Basin, Sri Lanka''
Natarajan Ishwaran
Journal of Tropical Ecology, Vol. 9, No. 2 (May, 1993), pp. 169-182][''The Hair'', Paul MacKenzie, Elephant Information Repository website][''Elephant Hair'', Elephant Anatomy, Animal Corner website] are often born with a covering of lanugo.
References
External links
- Photo of lanugo in a human infant, The Royal Infirmary of Edinburgh
Category:Hair physiology
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Sources: StartLearningNow, Wikipedia | Usage license: GNU FDL
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