font size

Definition of Hair, lanugal

Hair, lanugal: The downy hair on the body of the fetus and newborn baby.

The lanugal hair (or lanugo) is the first hair to be produced by the fetal hair follicles. It is very fine, soft and usually is unpigmented.

The lanugal hair is prenatal hair. It appears at about 5 months of gestation and begins to be shed at 7 and 8 months of gestation.

The postnatal hair that succeeds the lanugal hair is conventionally divided into vellus and terminal hair. The vellus resembles the lanugal hair in that it is short, soft and usually unpigmented. The terminal hair is longer, coarser and usually pigmented. There are intermediate types of hair. Any given follicle can change the type of hair it is making.

"Lanugo" is the Latin word for down, like the fine small hairs of plants.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=7751
Last Editorial Review: 8/28/2013

Drug Medical Dictionary of Terms by Letter

Top RxList Drug News

Parenting and Pregnancy

Get tips for baby and you.

advertisement
advertisement
Use Pill Finder Find it Now See Interactions

Pill Identifier on RxList

  • quick, easy,
    pill identification

Find a Local Pharmacy

  • including 24 hour, pharmacies

Interaction Checker

  • Check potential drug interactions
Search the Medical Dictionary for Health Definitions & Medical Abbreviations

NIH talks about Ebola on WebMD