Skin Layers
Skin Layers — the distinct horizontal strata that make up the skin, each with specialized cells and functions that together maintain protection, hydration, and structure. The three primary layers are the epidermis, dermis, and hypodermis, and the epidermis is further divided into several sublayers. Their coordinated roles determine how skin looks, feels, and responds to care.
Key points
- Skin is organized into three main layers: the epidermis, the dermis, and the hypodermis.
- The epidermis is subdivided into sublayers, typically including the stratum basale, spinosum, granulosum, and corneum, with an extra stratum lucidum in thick skin.
- Each layer performs specific roles, from barrier function in the epidermis to structural support in the dermis and insulation in the hypodermis.
- The layers work together and depend on one another, with the dermis supplying nutrients to the avascular epidermis above it.
Frequently asked
What are the main layers of skin in order?
From the surface inward, they are the epidermis, the dermis, and the hypodermis or subcutaneous layer.
How many sublayers does the epidermis have?
The epidermis usually has four sublayers, with a fifth, the stratum lucidum, present in thick skin such as the palms and soles.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
