Louisiana Esthetics State Board Practice Test

The stratum lucidum is indeed referred to as the clear layer that allows light to shine through. This specific layer is located within the epidermis, particularly in areas of thickened skin, such as the palms of the hands and the soles of the feet. The stratum lucidum is formed of a few rows of clear, flat, dead keratinocytes. Its translucent appearance is due to the presence of eleidin, a protein that is a precursor to keratin.

This layer serves as an additional barrier, helping to protect underlying tissues and maintain moisture levels within the skin. It also aids in the overall healing process by providing a protective layer during cellular turnover. The clarity of this layer is what enables light to penetrate and gives it its name, as it lacks pigmentation.

Other options do not accurately define the stratum lucidum: it is not an inner layer, it doesn't contain blood vessels, nor does it provide insulation; these characteristics describe different layers or functions of the skin.