Which layer is directly above the Stratum Spinosum?

Which layer is directly above the Stratum Spinosum?

• A. Stratum Granulosum
• B. Stratum Basale
• C. Stratum Corneum
• D. Stratum Lucidum

Answer: (A)

In the epidermis, keratinocytes mature as they move upward from the base toward the surface. The layer directly above the Stratum Spinosum is the Stratum Granulosum. In this layer, cells stop dividing and begin keratinization, accumulating keratohyalin granules and keratin filaments, while organelles degrade as the cells flatten and prepare to form the protective outer layers. The Granulosum sits beneath the Stratum Lucidum (when present) and the Stratum Corneum, with the Basale below the Spinosum. This placement explains why Granulosum is the layer directly above Spinosum.

In the epidermis, keratinocytes mature as they move upward from the base toward the surface. The layer directly above the Stratum Spinosum is the Stratum Granulosum. In this layer, cells stop dividing and begin keratinization, accumulating keratohyalin granules and keratin filaments, while organelles degrade as the cells flatten and prepare to form the protective outer layers. The Granulosum sits beneath the Stratum Lucidum (when present) and the Stratum Corneum, with the Basale below the Spinosum. This placement explains why Granulosum is the layer directly above Spinosum.