Hypodermis

Hypodermis

Introduction

• The hypodermis, also known as subcutaneous fascia (fat), is the third layer of the skin.

Location

• Lies beneath the dermis and above fascia and muscle.

Functions

• Shape: Gives the skin its shape.

• Insulation: Acts as a thermal insulator.

• Shock Absorption: Provides cushioning against impacts.

• Nutritional Depot: Stores nutrients until needed.

Structure

• Firmly attached to the lower surface of the dermis.

• Loosely bound to underlying structures, allowing skin mobility.

• Fat lobules surrounded by collagen fibers.

• Supports vascular networks, lymph vessels, and nerves.

Absence in Thin Skin Areas

• Not present in thin-skinned areas such as:

  • Eyelids

  • Nipples

  • Genitals

  • Shins