Which of the following epidermal layers is ONLY found in THICK skin? (In other words, which of the following epidermal layers is NOT found in THIN skin?)

Question

Which of the following epidermal layers is ONLY found in THICK skin?  (In other words, which of the following epidermal layers is NOT found in THIN skin?)

BlackTom AI · Accepted Answer

Question recap: Which epidermal layer is ONLY found in THICK skin and NOT in THIN skin?

Option 1: Stratum spinosum. This layer is present in both thin and thick skin and contributes to spindle-shaped cells and desmosomal connections; it is not exclusive to thick skin, so it cannot be the layer unique to thick skin.

Option 2: Stratum lucidum. This layer is a clear, thin zone of flattened, dead keratinocytes found only in thick skin (such as the palms and soles). Its presence distinguishes thick skin from thin skin, where the layer is absent, making it the candidate unique to thick skin.

Option 3: Stratum basale. Also known as the deepest layer where mitosis occurs, the stratum basale is present in both thin and thick skin, so it does not meet the criterion of being exclusive to thick skin.

Option 4: Stratum granulosum. This transitional layer with keratohyalin granules appears in both thin and thick skin, participating in the early stages of keratinization; its presence is not limited to thick skin.

Option 5: Stratum corneum. The outermost protective layer exists in both thin and thick skin, though its thickness varies; it is not exclusive to thick skin.

In sum, the feature of Stratum lucidum being present only in thick skin and absent in thin skin aligns with the question’s requirement, while the other layers are common to both skin types or not exclusive to thick skin. Note how each incorrect option either appears in both skin types or is not a unique feature of thick skin.

ANATOMY 2300 AU2025 (34636) Unit 1: Integumentary System

Which of the following epidermal layers is ONLY found in THICK skin? (In other words, which of the following epidermal layers is NOT found in THIN skin?)

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