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







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