What are the layers of skin in order from deep to superficial?

The order of the layers of skin from deep to superficial is accurately represented in the chosen answer: basal, spinosum, granulosum, lucidum, and corneum. This arrangement reflects the structure of the epidermis, which consists of several strata.

The basal layer, also known as the stratum basale, is the deepest layer and is responsible for the generation of new skin cells through cell division. Above it lies the spinosum layer, which provides strength and flexibility due to its spiny appearance and interconnected keratinocytes.

Next is the granulosum layer, where keratinization begins; the cells here start to die and lose their nuclei while also becoming filled with keratohyalin granules, essential for forming the protective barrier of the skin.

The lucidum layer is found only in thick skin areas, such as the palms of the hands and soles of the feet, providing an additional barrier in regions subjected to friction. Finally, the corneum layer, which is the outermost layer, consists of dead, flattened keratinized cells that serve as a protective layer against environmental threats.

This organization is critical for understanding skin physiology and the protective roles of each layer. By grasping the correct order, it