“Roopada”
Scientific Beauty News Letter 24
Melanin!
Melanocytes produce pigment melanin.
About 8 % of epidermal cells are melanocytes.
There are around 1000 and 2000 melanocytes per square millimetre of skin.
Although their size can vary, melanocytes are typically 7 micrometers in length.
Within the epidermis, melanocytes reside in the basal layer in a ratio of about 10 keratinocytes to 1 melanocyte.
Each melanocyte via its dendrites supplies melanin to about 30 nearby keratinocytes.
The difference in skin colour between fair people and dark people is not due to the number (quantity) of melanocytes in their skin, but to the activity of the melanocytes'.
There are two forms of the melanin:
Eumelanin granules, which tend to be round and smooth and produce black and brown skin pigmentation, and
Phaeomelanin granules, which are more irregular in shape and which are more prominent in lighter skins, particularly in association with red hair and freckles.
In humans, melanin is found in skin, hair. Melanin is the primary determinant of human skin color. Mainly present in the epidermis.
Epidermal melanin is produced by melanocytes, which are found in the stratum basale of the epidermis.
Some individual animals and humans have very little or no melanin in their bodies, a condition known as albinism.
Because melanin is an cluster of smaller component molecules, there are a number of different types of melanin with differing proportions and bonding patterns of these component molecules.
Both pheomelanin and eumelanin are found in human skin and hair, but eumelanin is the most abundant melanin in humans, as well as the form most likely to be deficient in albinism.
Tanning of the skin due to UV exposure represents an increase in the content of eumelanin within the epidermis and its major purpose is increased photoprotection.
Credit : Rahul Phate
Scientific Beauty News Letter 24
Melanin!
Melanocytes produce pigment melanin.
About 8 % of epidermal cells are melanocytes.
There are around 1000 and 2000 melanocytes per square millimetre of skin.
Although their size can vary, melanocytes are typically 7 micrometers in length.
Within the epidermis, melanocytes reside in the basal layer in a ratio of about 10 keratinocytes to 1 melanocyte.
Each melanocyte via its dendrites supplies melanin to about 30 nearby keratinocytes.
The difference in skin colour between fair people and dark people is not due to the number (quantity) of melanocytes in their skin, but to the activity of the melanocytes'.
There are two forms of the melanin:
Eumelanin granules, which tend to be round and smooth and produce black and brown skin pigmentation, and
Phaeomelanin granules, which are more irregular in shape and which are more prominent in lighter skins, particularly in association with red hair and freckles.
In humans, melanin is found in skin, hair. Melanin is the primary determinant of human skin color. Mainly present in the epidermis.
Epidermal melanin is produced by melanocytes, which are found in the stratum basale of the epidermis.
Some individual animals and humans have very little or no melanin in their bodies, a condition known as albinism.
Because melanin is an cluster of smaller component molecules, there are a number of different types of melanin with differing proportions and bonding patterns of these component molecules.
Both pheomelanin and eumelanin are found in human skin and hair, but eumelanin is the most abundant melanin in humans, as well as the form most likely to be deficient in albinism.
Tanning of the skin due to UV exposure represents an increase in the content of eumelanin within the epidermis and its major purpose is increased photoprotection.
Credit : Rahul Phate
No comments:
Post a Comment