Multiple choice

Which of the following is the outer most layer of the skin with dead cells?

  1. Stratum lucidum

  2. Stratum corneum

  3. Stratum spinosum

  4. Stratum granulosum

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The stratum corneum is the outermost layer of the epidermis, composed of 15-30 layers of dead, flattened keratinocytes that have lost their nuclei and organelles. These cells are continuously shed and replaced from deeper layers. This cornified layer provides the primary barrier against water loss, pathogens, and mechanical damage.