123ArticleOnline Logo
Welcome to 123ArticleOnline.com!
ALL >> Beauty >> View Article

What Are The Layers Of Human Skin?

Profile Picture
By Author: autor
Total Articles: 4328
Comment this article
Facebook ShareTwitter ShareGoogle+ ShareTwitter Share

Skin is an effective communicator between the outside environment and the brain (delicate touch, pain, pressure, hot and cold) Comprises 12-15% of an adults body weight, One square centimeter has:

• 6 million cells,
• 5000 sensory points
• 100 sweat glands
• 15 sebaceous glands

Skin formed from three layers:

• Epidermis (the outer layer)
• Dermis (true skin)
• Subcutaneous (fat) layer

A skin cell starts its life at the lower layer of the skin (the basal layer of the dermis), which is supplied with blood vessels and nerve ending. The cell migrates upward for about two weeks until it reaches the bottom portion of the epidermis, which is the outermost skin layer. The epidermis is not supplied with blood vessels, but has nerve endings. For another 2 weeks, the cell undergoes a series of changes in the epidermis, gradually flattening out and moving toward the surface. Then it dies and is shed.


Epidermis the "Outer Layer of the Skin"

The main function of the ...
... epidermis is to form a tough barrier against the outside world, while the dermis is a soft, thick cushion of connective tissue that lies directly below the epidermis and largely determines the way our skin looks. Both layers keep repairing and renewing themselves throughout or life, but the dermis does it more slowly than the epidermis. Under the dermis is a layer of fat cells, which is known as adipose tissue (or subcutaneous fat layer). It provides insulation and protective padding for the body. It also provides an emergency energy supply.

Dermis "True Skin"

The dermis is the layer responsible for the skins structural integrity, elasticity and resilience. Wrinkles develop in the dermis. Typical collagen and elastin creams, for example, never reach the dermis because collagen and elastin molecules are too large to penetrate the epidermis.

It is the thickest of the skin layers and comprises a tight, sturdy mesh of collagen and elastin fibers. Both collagen and elastin are critically important skin proteins: collagen is responsible for the structural support and elastin for the resilience of the skin.

The key type of cells in the dermis is fibroblasts, which synthesize collagen, elastin and other structural molecules. The proper function of fibroblasts is highly important for overall skin health.

The dermis also contains capillaries (tiny blood vessels) and lymph nodes which produce immune cells. Blood capillaries are responsible for bringing oxygen and nutrients to the skin and removing carbon dioxide and products of cell metabolism (what we call waste matter). Lymph nodes are engaged in protecting the skin from invading microorganisms.

Finally, the dermis contains sebaceous glands, sweat glands, hair follicles and a small number of nerve and muscle cells. Sebaceous glands, based around hair follicles, produce sebum, an oily protective substance that lubricates the skin and hair and provides protection by forming an acid mantle when mixed with sweat. When sebaceous gland produce too little sebum, as is common in older people, the skin becomes excessively dry and more prone to wrinkling. Too much of sebum, as is common in teenagers, often leads to acne.

Subcutaneous Tissue "Fat Layer"

Subcutaneous tissue is the deepest layer of the skin located under the dermis and consisting mainly of fat cells. It acts as a shock absorber and heat insulator, protecting underlying tissues from cold and trauma. The loss of subcutaneous tissue in later years, leads to facial sag and makes wrinkles more visible.


What are the skin Functions?

1. Sensation - nerve endings identify touch, heat, cold, pain and pressure

2. Heat regulation †cooling †perspiration (evaporation), warming †shivering (closes pores) and Goosebumps (tiny erect hairs trap warm air)

3. Absorption - ultraviolet rays (forms vitamin D for bone formation), essential oils and medicines (e.g. HRT, anti-smoking patches)

4. Protection - produces melanin to protect from too much UV light, acid mantle (sebum and sweat) protects against bacteria and moisture loss

5. Excretion - waste products and toxins are eliminated via sweat glands

6. Secretion - sebum keeps the skin lubricated and soft, and the sweat combines with the sebum to form an acid mantle to fight off infection

Total Views: 189Word Count: 662See All articles From Author

Add Comment

Beauty Articles

1. Rejuran Treatment: A Revolutionary Approach To Skin Healing
Author: Md Irfan Munsi

2. A Handbook For Queen Of India Pageant Preparation
Author: rishika

3. Sell Cryptocurrency For Cash In Dubai: A Quick Guide To Secure, In-person Transactions
Author: cryptodubaiotc

4. How To Maintain Your Lash Lift For Longer Results
Author: Beauty and Brow Aesthetics

5. Common Mistakes To Avoid When You Buy Tramadol Online
Author: Dentis Health Care

6. Revitalize And Rejuvenate: Discover The Best Massage Center In Doha
Author: embelliesalon1

7. Servo-asynchronmotor Siemens 1ph6103-4ng46 & 1ph6107-4ng46: Precision And Power For Industrial Applications
Author: Luconda

8. Finding The Perfect Asian Bridal Makeup Artist In London For Your Special Day
Author: Tina Prajapat Ltd

9. Toners To Beat Winter Dryness And Keep Your Skin Soft And Hydrated
Author: trego

10. Rejuvenate Your Skin With The Best Anti-ageing Facials For Lasting Youthfulness
Author: Ankita B Dhingra

11. How To Incorporate Superfoods Into Your Skincare Routine
Author: Derma Essence

12. Body To Body Massage In Dubai
Author: Alyona

13. What Is Eye Cream And Why Should You Use It
Author: Jens Jensen

14. Seiko 5 Sports – Luotettavuutta Ja Tyyliä | Salkari.fi
Author: salkari.fi

15. Boost Your Brand With The Best Digital Marketing Agency In Hyderabad
Author: Sanbrains Seo

Login To Account
Login Email:
Password:
Forgot Password?
New User?
Sign Up Newsletter
Email Address: