The epidermis is the outermost layer of the three layers of skin. Its thickness depends on where it is located on the body. For example, it's thinnest on the eyelids half a millimeter.
It's thickest on the palms of the hands and soles of the feet 1. The epidermis contains three specialized cells:. The dermis is the middle layer of the three layers of skin. It's located between the epidermis and the subcutaneous tissue. It contains connective tissue, blood capillaries, oil and sweat glands, nerve endings, and hair follicles.
The dermis is split into two parts—the papillary dermis, which is the thin, upper layer, and the reticular dermis, which is the thick, lower layer.
The thickness of the dermis varies depending on its location on the body. On the eyelids, it's 0. On the back, the palms of hands, and the soles of feet it's 3 millimeters thick. The dermis is home to three different types of tissues that are present throughout:.
The dermis contains several specialized cells and structures, including:. Subcutaneous tissue is the deepest and innermost layer of the three layers of skin. It's mostly made up of fat, connective tissue, and larger blood vessels and nerves. The thickness of this layer varies depending on where it's located on the body—for example, it's thickest on the buttocks, the soles of the feet, and the palms of the hands. Subcutaneous tissue is a vital component of body temperature regulation.
It also acts as a cushion, so if you ever fall or hit something with your body, it protects your insides and makes the injury hurt less. The integumentary system is a collection of organs that includes the skin, hair, nails, endocrine glands, and sensory nerves. The primary function of this system is to protect the body from external elements, such as bacteria or pollution. Third-degree burns affect the epidermis, dermis, and the inner-most layer, the subcutaneous tissue.
These burns may require skin grafting treatments, since the damage is so severe that the skin might be unable to repair itself. Injecting the pigment this deeply prevents the ink from wearing away so it can remain permanently visible. Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. The applied anatomy of human skin: A model for regeneration. Wound Medicine.
National Center For Biotechnology Information. Anatomy, skin integument ,epidermis. Updated June Ono S, Kabashima K. Melanocytes produce the skin coloring or pigment known as melanin , which gives skin its tan or brown color and helps protect the deeper layers of the skin from the harmful effects of the sun. Sun exposure causes melanocytes to increase production of melanin in order to protect the skin from damaging ultraviolet rays, producing a suntan.
Patches of melanin in the skin cause birthmarks, freckles and age spots. Melanoma develops when melanocytes undergo malignant transformation. Merkel cells, which are tactile cells of neuroectodermal origin , are also located in the basal layer of the epidermis. The squamous cell layer is located above the basal layer, and is also known as the stratum spinosum or "spiny layer" due to the fact that the cells are held together with spiny projections. Within this layer are the basal cells that have been pushed upward, however these maturing cells are now called squamous cells, or keratinocytes.
Keratinocytes produce keratin , a tough, protective protein that makes up the majority of the structure of the skin, hair , and nails.
The squamous cell layer is the thickest layer of the epidermis, and is involved in the transfer of certain substances in and out of the body. The squamous cell layer also contains cells called Langerhans cells. These cells attach themselves to antigens that invade damaged skin and alert the immune system to their presence.
The keratinocytes from the squamous layer are then pushed up through two thin epidermal layers called the stratum granulosum and the stratum lucidum.
As these cells move further towards the surface of the skin, they get bigger and flatter and adhere together, and then eventually become dehydrated and die.
This process results in the cells fusing together into layers of tough, durable material, which continue to migrate up to the surface of the skin. Read on to learn how to care for…. Whether your pockmarks were caused by acne, chickenpox, or another skin condition, the resulting scar can be difficult to fade.
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Ruined orgasms are about control, domination, and power. And with the right partner s , these aspects of kink can all be super sexy. Autosexual people are mainly sexually attracted to themselves. They typically experience little to no sexual attraction to other people. Health Conditions Discover Plan Connect. The Layers of Your Skin. Share on Pinterest. The three layers of skin.
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