Integumentary System

A system

An organ

The biggest!

Introduction

Largest organ of the body Surface area Mass One square inch contains… Complex Continuous

Layers of the Skin

Epidermis Dermis Subcutaneous (hypodermis)

Functions

Protection Water balance Temperature Regulation Waste Disposal Receptor organs Vitamin D Production

Epidermal Layers, part I

Stratum Basale (Germanativum) Stratum Spinosum

– Keratinocytes

Stratum Granulosum (Granular Layer)– Keratohyaline

Epidermal Layers, Part II

Stratum Lucium (Clear Layer)– Eleidin

Stratum Corneum– Keratin– Glycolipids