Questions: Which skin layer is not always present? Stratum Spinosum Stratum Lucidum Stratum Granulosum Stratum Corneum Stratum Basale

Which skin layer is not always present? Stratum Spinosum Stratum Lucidum Stratum Granulosum Stratum Corneum Stratum Basale
Transcript text: Which skin layer is not always present? Stratum Spinosum Stratum Lucidum Stratum Granulosum Stratum Corneum Stratum Basale
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Solution

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The answer is the second one: Stratum Lucidum.

Explanation for each option:

  1. Stratum Spinosum: This layer is always present in the epidermis. It is located above the stratum basale and is characterized by its spiny appearance due to the presence of desmosomes.

  2. Stratum Lucidum: This layer is not always present. It is found only in thick skin, such as the skin on the palms of the hands and the soles of the feet. It is a thin, clear layer that lies between the stratum granulosum and the stratum corneum.

  3. Stratum Granulosum: This layer is always present in the epidermis. It is where keratinocytes begin to die and keratin production increases.

  4. Stratum Corneum: This is the outermost layer of the epidermis and is always present. It consists of dead, keratinized cells that provide a protective barrier.

  5. Stratum Basale: This is the deepest layer of the epidermis and is always present. It contains the stem cells that continuously divide to produce new keratinocytes.

In summary, the Stratum Lucidum is the skin layer that is not always present, as it is only found in areas of thick skin.

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