Red Seal Cosmetology Practice Exam

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What is the primary function of the stratum spinosum?

Protection against UV rays
Initiation of keratinization
Beginning of skin cell shedding
Producing skin pigments

The correct answer is: Beginning of skin cell shedding

The primary function of the stratum spinosum is the beginning of skin cell shedding. This layer of the epidermis is responsible for creating new skin cells and pushing them to the surface, where they eventually shed off in a process called desquamation. The other options, while important functions of the skin, are not the primary function of the stratum spinosum. Protection against UV rays is the primary function of the stratum corneum, initiation of keratinization happens in the stratum basale, and producing skin pigments occurs in the stratum basale as well.