Birth marks (naevi) and vascular naevi, Biology

Birth Marks  (Naevi):

Birth Marks  is also known  as naevi.  It  is a multiplication  of  one or more cutaneous elements within  the skin. It  is defined  as a  congenital, circumscribed hyperplasia or growth  of  aberrant  embryonic nests in  the skin. There  are  two  types of  Naevi.  

(i)  the vascular Naevi, caused  by  hyperplasia  of blood or  lymph vessels.  

(ii) The  non-vascular Naevi  caused  by  an over growth of  connective or epidermal  tissue.  

Vascular Naevi:

A vascular naevus  is a localized  congenital hyperplasia of  cutaneous vessels and  formative  vascular tissue.  It  is usually present at  birth or  begins within a short time after  birth. It may increase in  size with growth,  remain  stationary ordisappear spontaneously. Any  part  of-the body may be involved.  This may  be associated  with other congenital infections such  as pigmented  moles, adenoma, sebaceum and fibromata. Extensive vascular  naevi may be associated with haemangioma  of  the eye or  the brain  (Sturge-Weber Syndrome). Different types of  vascular  naevi  include following.  

Posted Date: 10/26/2012 7:15:56 AM | Location : United States







Related Discussions:- Birth marks (naevi) and vascular naevi, Assignment Help, Ask Question on Birth marks (naevi) and vascular naevi, Get Answer, Expert's Help, Birth marks (naevi) and vascular naevi Discussions

Write discussion on Birth marks (naevi) and vascular naevi
Your posts are moderated
Related Questions
Explain the two forms of hemicellulose There are two forms of hemicellulose - Hemicellulose A and B - Hemicellulose A is precipitated upon neutralization of an alkaline extract

Zearalenone It was first isolated as the agent responsible for vulvovaginitis in pigs has very little acute toxicity, but there should be some concern about chronic exposure t

Hypolimnion - Summer Stratification This zone forms the bottom layer which is deep, cold and non- circulating. The hypolimnion is generally rich in nutrients though its oxygen

How do mineral salts participate in osmotic regulation? Osmotic pressure depends on the number of particles dissolved in a solution and not on the nature of such particles. Min

Vitamin D (Calciferol - vitamin D2) The main forms are Vitamin D2 (ergocalciferol-plant origin) and vitamin D3 (cholecalciferol-animal origin). Vitamin D2 forms colourless, aci

At a biotechnologist, employment opportunities can be found in many areas. In addition to biotechnology companies, where can a scientist with a biotechnology background find employ

#question.what are the organs of respiration in the lwer form of animals .

How to evaluate blanching efficiency? Finally, let us learn how to evaluate blanching efficiency? Normally, two of the more heat resistant plant enzymes, namely peroxidase and

FAT SOLUBLE VITAMINS Vitamin A Vitamin A may be of most practical importance in cattle feed. Vitamin A is essential for normal growth, reproduction, maintenance of epithel

Explain Post Myocardial Infarction Surgery Indications ? Indications for Surgery :  Presence of ventricular septal rupture is an indication for surgery. Timing of surgery is