Which layer of the epidermis is primarily responsible for the formation of fingerprints?

• A. Stratum granulosum
• B. Stratum corneum
• C. Stratum basale
• D. Stratum lucidum

Answer: (C)

Verified step by step guidance

1. Understand that fingerprints are formed by the interaction between the dermis and the epidermis, specifically due to the dermal papillae pushing into the epidermis.
2. Recognize that the Stratum basale is the deepest layer of the epidermis and is directly adjacent to the dermis, making it the layer responsible for the formation of fingerprints.
3. Learn that the Stratum basale contains basal cells (stem cells) that divide and produce new keratinocytes, and it is also where the ridges that form fingerprints originate.
4. Differentiate the Stratum basale from other layers of the epidermis, such as the Stratum corneum (outermost layer), Stratum granulosum (middle layer), and Stratum lucidum (found only in thick skin like palms and soles). These layers do not contribute to fingerprint formation.
5. Conclude that the Stratum basale's interaction with the dermal papillae is the key anatomical feature responsible for the unique patterns of fingerprints.