Question:medium
All are true about skin except:
All are true about skin except:
Show Hint
Epidermis is ectoderm but dermis is mesoderm.
Updated On: Jun 23, 2026
- Both dermis and epidermis are derived from ectoderm
- Skin accounts for a total of 15% of body weight
- Most of the cells in skin are keratinocytes derived from ectoderm
- Dermis is made up of type 1 and type 3 collagen in a 3:2 ratio
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: The question asks for the single incorrect fact, so scan each option for an error.
Step 2: Embryology is the trap. Only the epidermis arises from surface ectoderm; the dermis develops from mesoderm (and neural crest in the head region). Any option claiming the dermis is ectodermal is wrong.
Step 3: Checking the rest: the skin really is about 15% of body weight, keratinocytes really are the majority epidermal cell line of ectodermal origin, and dermal collagen really is predominantly types 1 and 3. All true.
Step 4: The only false statement is that both dermis and epidermis come from ectoderm, so that is the answer.
\[\boxed{\text{Both dermis and epidermis from ectoderm (false)}}\]
Step 2: Embryology is the trap. Only the epidermis arises from surface ectoderm; the dermis develops from mesoderm (and neural crest in the head region). Any option claiming the dermis is ectodermal is wrong.
Step 3: Checking the rest: the skin really is about 15% of body weight, keratinocytes really are the majority epidermal cell line of ectodermal origin, and dermal collagen really is predominantly types 1 and 3. All true.
Step 4: The only false statement is that both dermis and epidermis come from ectoderm, so that is the answer.
\[\boxed{\text{Both dermis and epidermis from ectoderm (false)}}\]
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