Rafa - Integumentary System

​Structure of the skin:

• The skin is the main organ of the “integumentary system”.

• SKIN is composed of four types of tissues:

  Epithelial Tissues, Connective Tissues, Muscles Tissues  Nerve Tissues

Science and Health 6​

​Epidermis

​▪outer layer of the skin

▪consists of epithelial cells

▪The outer layer of epidermal cells contains protein called “KERATIN” which water proofs and protects the cells and tissues that lie underneath.

Science and Health 6​

​Dermis

​▪second layer of the skin

▪directly between the epidermis and the subcutaneous layer

▪usually 15 to 40 times thicker than the epidermis.

​

Science and Health 6​

​Dermis

​

▪consists of connective tissues that prevent the skin from tearing and enables the skin to return to it’s normal state after being stretched.

▪contains structures including nerve cells, muscle fibers, sweat glands, oil glands, and hair follicles

Science and Health 6​

​Subcutaneous layer

​

▪layer of connective tissue that stores fats and helps the body retain heat.

Science and Health 6​

​HAIR

​

▪threadlike outgrowths from the follicles that are found in the dermis

▪made up of keratin and melanin

▪keeps dusts, insects and other unwanted things out of the body

Science and Health 6​

​NAIL

​

▪hard, thin covering on the upper surface of the ends of the fingers or toes

​

▪made of keratin

​

▪ The fingernail generally serve two purposes:

-serves as a protective plate

- enhances sensation of the fingertip

Science and Health 6​