Structure of Skin The skin, the largest organ of the human body, serves as a protective barrier and has three primary layers: 1. Epidermis 2. Dermis 3. Hypodermis (Subcutaneous Tissue) Functions of the Skin Structure of the Eye The eye is a highly specialized sensory organ responsible for vision. It is composed of several layers, chambers, and accessory structures that work together to capture and process visual information. 1. Anatomy