Linea nigra

Linea nigra as seen in a pregnant woman
A Cesarean section scar (horizontal red line) and linea nigra visible on a 31-year-old woman 7 weeks after childbirth.

Linea nigra (Latin for "black line") is a dark vertical line that appears on the abdomen during about three quarters of all pregnancies.[1] The brownish streak is usually about a centimeter in width. The line runs vertically along the midline of the abdomen from the pubis to the umbilicus, but can also run from the pubis to the top of the abdomen.[2] Linea nigra is due to increased melanocyte-stimulating hormone made by the placenta,[3] which also causes melasma and darkened nipples.

Fair-skinned women show this phenomenon less often than women with darker pigmentation.[4] Linea nigra typically disappears within a few months after delivery.

See also

References

  1. ↑ Estève E, Saudeau L, Pierre F, Barruet K, Vaillant L, Lorette G (1994). "[Physiological cutaneous signs in normal pregnancy: a study of 60 pregnant women]". Ann Dermatol Venereol (in French) 121 (3): 227–231. PMID 7832550.
  2. ↑ She Knows Network: "What's that line? All about linea nigra"
  3. ↑ Heffner, Linda (2010). The Reproductive System at a Glance. Wiley-Blackwell. p. 51. ISBN 978-1-4051-9452-5.
  4. ↑ Pregmed, Editor. "Linea nigra and pregnancy". Pregmed. Retrieved 22 February 2015.

Media related to Linea nigra at Wikimedia Commons

This article is issued from Wikipedia - version of the Thursday, September 10, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.