What is the correct order of the layers of the epidermis from superficial to deep?

The correct order of the layers of the epidermis from superficial to deep is stratum corneum, stratum granulosum, stratum spinosum, and stratum basale.

The epidermis consists of several layers, all of which have distinct functions and properties. The stratum corneum represents the outermost layer, comprised of dead keratinized cells that provide a protective barrier against environmental factors like pathogens and moisture loss. Beneath the stratum corneum is the stratum granulosum, where keratinization begins and cells start to die and accumulate granules essential for this process.

Next is the stratum spinosum, which contains living keratinocytes and provides strength and flexibility to the skin due to the presence of desmosomes that connect the cells. The deepest layer is the stratum basale, where active cell division occurs, producing new keratinocytes that will migrate outward to replenish the layers above.

This hierarchy is essential for understanding skin health and the processes of regeneration and protection the skin undergoes.