Properties of Your Skin

Your Skin,
the largest organ of your body

When you compare it to other body structures, the skin is unique because it is continuously exposed to the environment

From the biological point of view, skin can be described as a layered structure. The three main layers are subcutaneous tissue, dermis (cortium), and epidermis. The surface of skin itself can be approximated to be diffusional or matt because the uppermost level of skin is covered with dead cells causing no regular reflection. These dead cells are optically inactive (i.e. no fluorescent). The glossiness of skin can be due to sweat, skin oil or some products used to cover the surface.

Structure of the skin. Structure of the epidermis: (1) Keratin, (2) Horny layer, (3) Lucid layer, (4) Granular layer, (5) Spinous layer, (6) Basal layer and (7) Dermis.

The final skin spectra are formed by the interaction between skin and light: light striking skin is transmitted, absorbed, and reflected through the layers. The spectra for human skin generally form a continuous homologous series because of characterization caused by absorption of melanin and haemoglobin (Edwards & Duntley 1939). It has a higher relative reflectance in long wavelengths (orange and red) than in short ones (blue and green). Like most natural objects the skin has spectral variability which is in this case mainly due to amount, density, and distribution of melanin. The skin can be described as an optically inhomogeneous material because under the surface there are colourant particles which interact with light, producing scattering and colouration.

31 comments

  1. your7714

    great post!

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