Which of the following is not found in the epidermis?
Melanocytes
Fibroblasts
Stem cells
Keratinocytes
Tactile cells

Question

BlackTom AI · Accepted Answer

The question asks which option is not found in the epidermis.

Option A: Melanocytes. These pigment-producing cells reside in the epidermis, particularly in the stratum basale, where they transfer pigment to keratinocytes. So this is found in the epidermis.

Option B: Fibroblasts. These cells synthesize collagen and other extracellular matrix components and are predominantly located in the dermis, not in the epidermis. Their usual habitat is the deeper connective tissue layer, making this option not part of the epidermis.

Option C: Stem cells. In the epidermis, the basal (stratum basale) layer contains stem cells that divide to renew keratinocytes. Hence, stem cells are indeed found in the epidermis.

Option D: Keratinocytes. These are the most abundant epidermal cells, forming the protective outer layer as they differentiate and migrate upward through the epidermal strata. Therefore, they are clearly part of the epidermis.

Option E: Tactile cells. Also known as Merkel cells, these are specialized mechanoreceptors located in the epidermis (often in the basal layer) and contribute to tactile sensation. Thus, they are found in the epidermis.

Putting it together, the option that is not found in the epidermis is the one describing fibroblasts, whose typical location is the dermis rather than the epidermal layer.

BIOL109LV02 HW#5 Skin; Bone Structure; Skull; Axial Skeleton; Exercises 7; 8; 9

Which of the following is not found in the epidermis? Melanocytes Fibroblasts Stem cells Keratinocytes Tactile cells

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