Pg 23 Skin Structure’s Functions

Dermis: middle layer A. Tissue Type Tissue: Dense Irregular Connective Tissue Contains: Collagen Fibers: Strong and resist stretching but can bend Elastic Fibers: allow stretching but also recoil back

Dermis: 2 layers B. Layers Within: Papillary Layer (top Layer) Dermal papillae Indent into epidermis forms fingerprints Important for grip

Dermis: 2 layers Reticular layer- 2nd layer Lamellar Corpuscles –receptors stimulated by deep pressure and high frequency vibration

C. Structures within the Dermis Nerve fibers: control blood flow regulate corpuscle response (pressure) regulate gland production (Sweat, oil)

C. Structures within the Dermis 2.) Arrector pili muscles: raise the hair during fear or with chill bumps Squeeze oil out and onto hair and skin

C. Structures within the Dermis 3.) Hair follicle: protect from UV rays insulate keep out bacteria sensation temp regulation

C. Structures within the Dermis 4. Eccrine Sweat Gland: most are found in palms and soles temp regulation remove bacterial from the surface of our skin

C. Structures within the Dermis 5. Sebaceous (oil) glands: oil/lipid prevents growth of bacteria, lubricates the hair and skin

C. Structures within the Dermis 6. Lamellar Corpuscles (Pacinian) recognize deep touch ADD to pg 23 diagram: Meissner’s Corpuscles: fine touch to identify specific objects

Hypodermis/Subcutaneous Layer Not usually considered part of the skin Tissue Type: adipose tissue and some areolar tissue Anchors skin to underlying organs shock absorption Insulation stores energy Very vascular Site of subcutaneous injections – absorbed directly into blood stream

Create a VENN Diagram on the Epidermis, Dermis, and Hypodermis Pg 26 “Comparing and contrasting skin layers” Create a VENN Diagram on the Epidermis, Dermis, and Hypodermis Epidermis Dermis Hypodermis