The third layer of the skin is the hypodermis, also known as the subcutaneous tissue.
Understanding the Skin's Layers
Human skin is comprised of three main layers:
- Epidermis: This is the outermost layer, acting as a waterproof, protective barrier. It's further divided into several sub-layers.
- Dermis: Located beneath the epidermis, the dermis is the middle layer containing blood vessels, nerve endings, hair follicles, and sweat glands.
- Hypodermis (Subcutaneous Tissue): This is the deepest layer, primarily composed of fat and connective tissue. It provides insulation, cushioning, and energy storage.
Several sources confirm this three-layer structure:
- StatPearls: "The skin has 3 layers—the epidermis, dermis, and hypodermis..." https://www.ncbi.nlm.nih.gov/books/NBK470464/
- Cleveland Clinic: "...Hypodermis, the bottom or fatty layer." https://my.clevelandclinic.org/health/body/10978-skin
- Verywell Health: "You have three main layers of skin—the epidermis, dermis, and hypodermis (subcutaneous tissue)." https://www.verywellhealth.com/skin-anatomy-1068880
- Dermaesthetics Beverly Hills: "There are three primary layers that make up the skin. ...The hypodermis is the deepest layer..." https://dermaestheticsusa.com/blogs/dbh-skincare/what-are-the-3-layers-of-the-skin
The hypodermis plays a crucial role in body temperature regulation, energy storage, and protection of underlying organs. Its fatty composition provides insulation against cold temperatures and acts as a shock absorber.
