Skin Anatomy of Skin 375b4534 Dermatophytes primarily involves _______: A Stratum corneum B Stratum granulosum C Stratum basale D Stratum spinosum High-Yield Explanation Ans. A. Stratum corneumDermatophytes infect and survive only in the dead keratin layers of skin (stratum corneum), hair and nails as they are keratinophilic.