1. Part 1 Directions: Use page 552 in your textbook to identify the parts of the skin

1. hair Use page 552 to identify the parts of the skin. 2. hair follicle 5. fat 4. blood vessels 3. oil gland 7. sweat gland 6. nerves 8. hypodermis 9. dermis 10. epidermis

Part 2 Cross Section of Skin (Microscopic). Directions: Use the previous diagram to identify the parts of the skin below

Cross Section of Skin (Microscopic). Use page 552 to identify the parts of the skin below. 1. hair follicle 3. epidermis 4. dermis 5. hypodermis 2. sweat glands

The Epidermis Diagram of the skin's upper layer called the epidermis (outer paper-thin envelope). Diagram shows the layers which comprise the epidermis including the dead horn layer known as the stratum corneum, the final layer of transition between the dead and alive layers called the granulosum and the live prickle cell layer as well as the basal layer which lies against the dermis (leather layer of the skin). Note the individual melanocyte or pigment cells that are found along the basal layer. Part 3 Directions: read the above caption, look at the diagram at the left and answer the questions below. 1.Where are the dead skin cells located? 2.Which layer do you think new skin cells are made? 3.Use page 5 as a guide to determine what types of epithelia cells make up the stratum granulosum. The basal layer. 4.Use the microscope (high power objective) to view simple cuboidal epithelial cells and simple columnar epethelial cells (use page 5 as a guide).

Hair Follicle Above is a whole hair follicle that has been dissected from the skin of a man with dark brown hair. In the hair follicle bulb you can see a mass of brown melanin and above this the hair fiber. The melanocytes full of pigment and the adjacent keratinocytes are actually in an upturned cup shape (think in 3D) that sits over the pear shaped dermal papilla. You can the bottom of the pear shaped dermal papilla below the mass of brown pigment. As the hair fiber grows, the mass of brown pigment will be incorporated into the hair fiber cells. Part 4 Directions: read the above caption, look at the diagram at the left, follow the procedure below and answer the questions below. 1.Pull a single hair out of your head and make a wet mount slide out of the base of the hair. 2.Look at the hair follicle end with all objectives. 3.Explain what the difference you see from the diagram at the left and what you see in the microscope. Again this picture was taken with the hair still in the follicle of the dermis. Remember you pulled the hair out of the dermis.

Page 5: Types of Epithelia Cells

Cross Section of Skin (Microscopic). Use page 552 to identify the parts of the skin below.

Use page 552 to identify the parts of the skin.