The Skin and its Appendages


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Lecture´s Description

In this video lecture, the educator briefs about the the Skin and its Appendages. The integumentary system includes the skin and the skin derivatives like hair, nails, and glands.

The Integument is the largest system of the body (16% of body weight, 1.5 to 2 m2 in area). The integument is made up of two parts. Cutaneous membrane & Accessory structures. The functions of the Integumentary system include protection, produces vitamin D and sensations.

The structure of the 3 layers of skin includes Epidermis, Dermis and Hypodermis. The Epidermis is a vascular stratified squamous epithelium.

Structures of the Epidermis consists of the five strata of keratinocytes in thick skin. There are two components of dermis i.e. outer papillary layer and deep reticular layer. The functions of Hypodermis (Subcutaneous Layer) are stabilizing the skin, allowing separate movement. It is made of elastic areolar and adipose tissues and connected to the reticular layer of integument by connective tissue fibers. The Medulla includes core, dead cells contain soft keratin and air to provide flexibility. 

Nail Production occurs in a deep epidermal fold near the bone called the nail root. Nail body is the visible portion of the nail and covers the nail bed.

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