Glossary

Corneocytes are biologically dead cells since they have lost their nucleus. They nevertheless remain active. They form the most superficial layer of our skin (stratum corneum). They gradually flake off as new epidermal cells come to maturity and migrate towards the surface. The skin's ageing process is characterised by its irregular desquamation and loss of corneocyte compaction. This leads to rough skin. Peels are used to eliminate the dead cells on the surface of the skin. Cohesion between corneocytes is maintained due to a lipid cement which contains ceramides and other molecules capable of binding water (hygroscopic effect) regrouped under the term NMF (Natural Moisturising Factor). Cosmetic products are applied on this stratum corneum.