Human Skin
42
Skin & Sense of touching
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Human Skin, Research Paper
Transcript of Human Skin
All multicellular organisms have a skin composed of one or more layers. Main functions of the skin are …
1) Protection of the inner layers of the body from physical and chemical effects
) Prevention of the entry of the microbes !) Prevention of "ater loss in terrestrial organisms #) Protection of the cells from $% light or intense
light ) 'egulation of body temperature
1) Protection of the inner layers of the body from physical and chemical effects
Acid burn
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3ormal 4air 5ollicle
1) +pidermis
he keratini7ed layer is the superficial layer of dead s8uamous cells.
9t is composed of keratini7ed epithelial cells .
Pigment melanin: "hich gives the color of the skin: is present in melanocytes of the epidermis.
melanocytes
9t is appro imately ( times thicker than the epidermis. 9t originates from the mesoderm in the embryo.
he dermis contains …
1) ;lood vessels
he color of the hair is given by the pigment melanin. he more the melanin production is the blacker the
,) 1he receptors of the skin are present in the dermis. hese receptors are functional in the reception of touch: pressure: temperature and pain. ;est kno"n receptors are …
a) Pacinian corpuscles
d) 4air follicle receptors
e) 5ree nerve endings.
a) Pacinian corpuscles are the most important receptors of the skin.
hey are the greatest mechanoreceptors in the skin.
b) Meissner and Merkel?s corpuscles are involved in light pressure changes and therefore located in the fingers and lips.
Meissner s corpuscle
c) @rause and 'uffini corpuscles are the receptors that are responsible to detect temperature changes. @rause corpuscles are for cold reception and 'uffini corpuscles are for hot reception .
'uffini /orpuscle@rause /orpuscle