Question

Which of the following is not a layer of the epidermis?

• A. Cornified layer
• B. Granular layer
• C. Papillary layer
• D. Spinous layer

Answer 1

The correct option is C

Papillary layer

The correct option is C.

The explanation or the correct option:

1. The top layer of the dermis is known as the papillary layer.
2. It is much thinner in comparison to the reticular dermis.
3. It comprises fibroblast cells, collagen fibers, blood vessels, fat cells, touch receptors, and nerve fibers.
4. The prime function of the papillary layer is to supply nutrients to the select layers of the epidermis and to monitor the temperature.

The explanation for the incorrect options:

Option A.

1. The epidermis is the outermost layer of the skin.
2. The cornified layer is the top of the epidermis and comprises thickened and dead squamous cells.
3. It protects the skin from environmental damage like radiation from the Sun.

Option B:

1. The granular layer also known as stratum granulosum is a thin layer of cells in the epidermis present below the stratum corneum and above the stratum spinosum.
2. The layer comprises granules, which constitute a lipid-rich secretion that works as a water sealant.

Option D:

1. The spinous layer also known as the stratum spinosum is a layer of the epidermis found between the stratum basale and stratum granulosum.
2. This layer functions as a biological and physical barrier against the environment, by preventing penetration by allergens and irritants and loss of water at the time of sustaining internal homeostasis.

Final answer: Papillary layer is not a layer of the epidermis.