What is the primary feature of the stratum granulosum?

The stratum granulosum is characterized by its distinct layer of cells that undergo a process known as keratinization. This layer consists of three to five rows of flattened cells where the cells contain keratohyalin granules, which are essential precursors to keratin. The presence of these granules indicates that the cells are transitioning from living cells to a more protective, keratinized state as they move toward the skin's surface.

This layer serves a crucial role in the integumentary system, contributing to the barrier function of the skin. As the cells lose their nuclei and cytoplasmic organelles, they produce keratin, which helps to waterproof the skin and protect underlying tissues from environmental damage. The stratum granulosum acts as a transitional layer between the deeper layers of living cells and the outermost layer of dead keratinized cells, emphasizing its importance in the overall structure and function of the epidermis.

Other options describe features that do not accurately depict the characteristics of the stratum granulosum. The rapid division of cells is associated with the basal layer of the epidermis, while a thickened layer of dead cells for protection pertains to the stratum corneum. The presence of nerve endings and sensory receptors