ISP: Structure of the Integumentary System Lesson

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Structure of the Integumentary System

The integumentary system is the home to the largest organ of the human body, the skin. The skin is formed by two or more tissue types, meeting the qualifications of an organ. The distinct layers of the skin include the epidermis and dermis.  The skin is securely anchored to underlying surfaces through the vast network of the hypodermis or subcutaneous layer. 

The structure of human skin is described. Hairless thick skin consists of the outer epidermis layer, the superficial arteriovenous plexus, and the papillary dermis. Next, in the dermis layer, are the reticular dermis, Meissner's corpuscle, and the sweat duct. In the subcutis/hypodermis, there is deep arteriovenous plexus and subcutaneous fat. Also located within human skin are dermal nerve fibers, eccrine sweat glands, and Pacinian corpuscles. In hairy thin skin, the hair shafts and opening of sweat ducts are detailed. The skin includes the dermal papillae, the arrector pili muscle, sebaceous glands, hair follicles, eccrine sweat ducts, and eccrine sweat glands.

 

The third, deeper layer, lying under the dermis, is the subcutaneous layer. This layer consists primarily of fat and connective tissue. Let's take a look at the cell variability found in the connective tissue.

The video below shows the immune system's white blood cells attacking bacteria and viruses.

 

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IMAGES CREATED BY GAVS OR OPENSOURCE