My boys spend hours adding and subtracting muscles, a respiratory system, nerve endings, epidermis, etc.

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They found a metal-like shine on the leaves, indicating that the upper and lower epidermis were dying.

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Otherwise the epidermis becomes parched, resulting in micro-cracks in the skin and lips.

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On the other end of the spectrum, you've got the dudes who stick with a shirt until it starts to fuse with their epidermis.

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"We are hypothesising that having these genes expressed in the epidermis will provide a first line of defence as insecticides penetrate the skin, " he explained.

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Nonablative lasers are less intense, so they don't injure the epidermis.

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The LEDs on GentleWaves shoot weak light (less than 25 watts) through the skin's epidermis to fibroblast cells, which produce structural proteins such as collagen and elastin.

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The LEDs on GentleWaves shoot weak light (less than 25 watts) through the skin's epidermis to fibroblast cells, which produce such structural proteins as collagen and elastin.

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In ablative (wounding) laser resurfacing, a laser beam destroys the outer layer of skin (epidermis) and heats the underlying skin (dermis), which stimulates the growth of new collagen fibers.

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Nelson's injuries destroyed all three main skin layers - the epidermis, dermis and hypodermis (the top, middle and bottom), in some places right down to the periosteum, the membrane overlying the bone.

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