New cells grow from the deepest layer of the epidermis, which is the: adipose tissue, the stratum basale, the stratum corneum, or the dermis?

1 Answer
May 20, 2017

The stratum basale


The epidermis consists of four strata (layers) - consists of 4 layers: Corneum, Granulosum, Spinosum and Basale (thick skin - e.g. on the soles of your feet - has a fifth layer beneath corneum called Lucidium because it is subject to more wear and tear).!
Here is a summary of what each layer does.

Corneum - This is the outermost, roughest layer that consists of 20 - 30 layers of dead keratinocytes. They are dead, flat cells that are filled with a protein called keratin. They flake off the surface of the skin only to be replaced by new cells that rise up from lower layers.

Lucidum - This layer is only present in thick epidermis Lucidum is latin for clear, which makes sense as the Lucidium consists of 2 - 3 layers of clear, flat, dead keratinocytes

Granulosum The first layer to contain living cells, this layer has a grainy appearance due to the cells being moved up as they produce keratin.

Spinosum The cells in this layer look spiny when dried for a microscope sample because of tiny filaments that join the cells together.

Basal/e The bottom layer, this is where mitosis and most of the cell production occurs. It also connects the epidermis to the dermis.

A useful, but ironic, way to remember these layers is with the following mnemonic:
Come, Lets Get Sun Burnt
Come - Corneum
Lets - Lucidum
Get - Granulosum
Sun - Spinosum
Burned - Basal/e

Hope this helps; let me know if I can do anything else:)