Question

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Explanation:

Identify the anatomical location and skin type

Using the Epidermal Layers knowledge point

• Location: Palmar surface of the hand.
• Skin type: Thick skin (contains five epidermal layers).

Determine the order of epidermal layers from superficial to deep

Using the Epidermal Layers knowledge point

• Superficial to deep sequence in thick skin:

1. Stratum corneum
2. Stratum lucidum
3. Stratum granulosum
4. Stratum spinosum
5. Stratum basale

Trace the path of the penetrating splinter

Using the Epidermal Layers knowledge point

• The splinter penetrates from the outside (superficial) inward (deep).
• It reaches the stratum basale (the deepest layer of the epidermis).
• The question asks for the "final layer injured by this splinter" among the multiple-choice options.
• The options listed are:
• Stratum granulosum of the epidermis
• Stratum lucidum of the epidermis
• Stratum spinosum of the epidermis
• Stratum corneum of the epidermis
• Since the splinter penetrates from superficial to deep, the sequence of injury is: stratum corneum $

ightarrow$ stratum lucidum $
ightarrow$ stratum granulosum $
ightarrow$ stratum spinosum $
ightarrow$ stratum basale.

• Among the options provided, the deepest layer reached (and thus the final layer injured among the choices, or the deepest layer before reaching stratum basale) is the stratum spinosum.

Match with the correct option

Using the Epidermal Layers knowledge point

• The deepest layer among the options is the stratum spinosum of the epidermis.

Answer:

• stratum granulosum of the epidermis
• stratum lucidum of the epidermis
• stratum spinosum of the epidermis (Correct answer)
• stratum corneum of the epidermis