Question

While walking barefoot on the beach, Joe stepped on a thorn that penetrated through the sole of his foot to the dermis. How many layers of epidermis did the thorn penetrate? While walking barefoot on the beach, Joe stepped on a thorn that penetrated through the sole of his foot to the dermis. How many layers of epidermis did the thorn penetrate? 1 2 3 4 5

Answer 1

Answer:

The correct answer is 5.

Explanation:

The main layers of the skin are from outside to inside:

1. Epidermis
2. Dermis
3. Hypodermis

The epidermis can also be divided into 5 other layers (form outside to inside):

1. Stratum corneum: composed of corneocytes without nucleus
2. Stratum lucidum: this stratum is only in palms and soles, and gives them the thick skin appearance
3. Stratum granulosum: composed of keratinocytes whose nucleus disappear and left a granulated cytoplasm
4. Stratum spinosum: keratinocytes connected via desmosomes  
5. Stratum basale: keratinocytes connected via hemidesmosomes. Melanocytes and Merckel cells can also be found in this layer.