Skin Barrier - Function And Structure

Skin Barrier - Function And Structure

November 02, 2023
skin barrier

The skin is the body’s largest organ and it’s also the first line of defence to the outside world. It’s made up of three main layers: the hypodermis (deepest layer), the dermis (middle layer) and the epidermis (upper layer). The outermost layer of the epidermis is called the stratum corneum and it forms the ‘skin barrier’, a complex structure whose job is to keep moisture in and allergens and irritants out1.

illustration  of skin barrier

The easiest way to picture the structure of the skin barrier is to think of a brick wall. The dead skin cells are like the bricks, providing strength and structure, and they’re held together with mortar—or, in the skin’s case, a mixture of lipids that fill the spaces between the cells and play an important role in water regulation2. Proper water regulation is key to help maintain smooth, hydrated and healthy-looking skin.

While the skin can be extremely resilient, the skin barrier itself is sensitive to several factors like humidity, temperature, and pH, and requires the right conditions to function optimally3 4.

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