The skin

802 views

Published on

0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
802
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
13
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

The skin

  1. 1. The Skin By: Frank Lemond Biology 120 June 17, 2010
  2. 2. <ul><li>I recently learned that the skin is an organ. Prior to that, when I thought of organs, I associated that with internal organs that we can’t see, such as the stomach. </li></ul>
  3. 3. <ul><li>The skin is the biggest organ in the body in terms of surface area. </li></ul><ul><li>The accessory organs of the skin are: the sebaceous glands, the sweat glands, the nails and hair, so these 4 + the skin = 5 components. </li></ul><ul><li>These components comprise the integumentary system, so the skin = the integumentary system. </li></ul>
  4. 4. Epidermis <ul><li>In addition to the 5 components of skin, the skin has 3 layers. </li></ul><ul><li>The outermost layer (that we see) = the epidermis. The epidermis is a thin membrane. (The photo @ left is an electron microscopic view of the epidermis). The deepest layer of the epidermis contains a protein called keratin (the same substance in hair & nails). </li></ul>
  5. 5. dermis <ul><li>DERMIS </li></ul><ul><li>Inside (underneath the epidermis) = the dermis, also known as the corium. </li></ul><ul><li>The dermis consists of: collagen fibers. </li></ul><ul><li>In addition to the aforementioned sebaceous and sweat glands, nails and hair, the dermis contains muscle fibers, nerve fibers, sense of touch receptors, lymph vessels and blood vessels </li></ul>
  6. 6. SUBCUTENEOUS LAYER <ul><li>The 3 rd (deepest) layer of our skin = the subcutaneous layer. This layer = aka the hypodermis. </li></ul><ul><li>This inside tissue layer consists of lipocytes (fat cells) that insulate the body & protect the internal organs + skeletal structure. </li></ul>
  7. 7. FYI <ul><li>FYI: </li></ul><ul><li>This photo, taken with ultraviolet light, is of a rhino’s horn. The horn = covered with a thin coating of hardened keratins. (Again, the same substance found in our hair & nails). </li></ul>
  8. 8. FINALLY <ul><li>Skin = a miraculous thing. Unfortunately, some desperate women (& men) sell their precious bodies. </li></ul>
  9. 9. INFINITE GRATITUDE TO… <ul><li>Google images, including… </li></ul><ul><li>www.science.nationalgeographic.com </li></ul><ul><li>www.wheelessonline.com </li></ul><ul><li>www.oucom.ohiou.edu </li></ul><ul><li>www.cartoonstock.com </li></ul>

×