Instructions

1. There are 5 layers to the epidermis & you will represent each layer within your drawing. Add each of the following epidermal layers and color each as indicated below. Be sure to make the thickness of each layer proportional to what it is in real life (number of cell layers thick). stratum basale (dark purple)stratum spinosum (orange) stratum granulosum (pink) Stratum lucidum (clear/white)stratum corneum (white w/ black dashes) 2. Black stars* will represent Melanocytes which produce pigment. Add stars to the Stratum basale, spinosum and granulosum. 3. Green plus signs (+) will represent Keratinocytes which water repel on the skin. Add + to 4 layers. 4. Red dollar signs ($) will represent Langerhans cells which defend against pathogens. Add $ to Stratum spinosum 5. Color & Label each of the following nerve endings as directed below. free dendrite nerve endings (gray)Merkel discs “light touch” receptor (pink) 6. Make sure to leave room in your epidermis for the hair root to pass through & outside of the epidermis. Label the hair shaft. 7. Write the Four (4) functions of the epidermis.

GRADING MATRIX: SKIN MODEL Points Possible Score Epidermis 1. Stratum basale (dark purple) & label the layer2 1. Stratum spinosum (orange) & label the layer2 1. Stratum ganulosum (pink) & label the layer2 1. Stratum lucidum (white/clear) & label the layer 2 1. Stratum corneum ( white w/black dashes) & label the layer 2 1. Melanocytes (black *) to basale, spinosum & granulosum & label it’s function 4 1.Langerhans Cells (red $) to spinosum & label it’s function2 Keratinocytes (Green +) to all but lucidum & label it’s function8 1. Free dendrite nerve endings (grey) up to basale2 1. Merkel discs (pink) to basale & label it’s function2 1. All structures labeled in black marker Function of epidermis indicated4 1. Total38 Other Neatness1 Wow Factor1

Each of the following structures is found within the dermis. Nerves (grey)Meissner's Corpuscles (light brown) Pacinian's Corpusles (light pink)Sebaceous glands (dark pink) Arrector pili muscles (red)Sudoriferous glands (dark green) Krause's end bulbs (light blue)Ruffini's Corpuscles (orange) Arteries - left (red)Veins -right (blue) Capillaries(left½ red; right½ blue) Areolar Connective tissue (papillary layer = light green) Hair Root (dark brown) Dense Connective tissue (reticulary layer = light purple) Write the function of the dermis. Label all structures’ function. (i.e. sudoriferous gland- sweat gland) Tape the epidermis above the dermis.

GRADING MATRIX: SKIN MODEL Points Possible Score Dermis 1. Nerves (gray) to reticular & papillary layers3 1. Meissner’s Corpuscles (light brown) to papillary layer & give function3 1. Pacinian Corpuscles (light pink) to reticular layer & give function3 1. Sebaceous glands (dark pink) to reticular layer & give function3 1. Arrector pili muscles (red) to reticular & papillary layers & give function4 1. Sudoriferous glands (dark green) to reticular layer & give function3 1. Krause’s end bulbs (light blue) to papillary layer & give function3 1. Ruffini’s Corpuscles (orange) to papillary layer & give function3 1. Arteries (red) to reticular & papillary layers2 1. Veins (blue) to reticular & papillary layers2 1. Capillaries (½ red ½ blue) to reticular & papillary layers2 1. Hair Root (dark brown) to reticular & papillary layers2 1.Aerolar Connective tissue (papillary layer = light green)2 1.Dense Connective tissue (reticulary layer = light purple)2 1. All structures labeled in black marker Function of dermis indicated3 Total46 Other Neatness6 Wow Factor

Each of the following structures is found within the hypodermis. Adipose tissue (yellow)Areolar tissue (light green) Arteries - superior (red)Veins - inferior (blue) Capillaries (left½ red; right½ blue)Sudoriferous gland (dark green) Nerves gray Tape the hypodermis below the dermis. Write the function of the hypodermis, dermis, & epidermis. Label all structures with their scientific names & functional name.

GRADING MATRIX: SKIN MODEL Points Possible Score Hypodermis 1. Adipose tissue (yellow)2 1. Arteries (red)2 1. Veins (blue)2 1. Capillaries (½ red ½ blue)2 1. Nerves (gray)2 1. Sudoriferous glands (dark green)2 1. All structures labeled in black marker6 1. Function of epidermis indicated6 1. Total24 Other Neatness6 Wow Factor