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Anatomy/Physiology
Unit 5 Vocabulary
| Term | Definition |
|---|---|
| Epidermis | Top layer of skin; For protection |
| Stratum Corneum | Outer layer of the epidermis; Dead squamous cells (25 or more layers). Filled with keratin and lipids desmosome connections. |
| Stratum Granulosum (or granular layer) | A thin layer of cells in the epidermis. Keratinocytes migrating from the underlying stratum spinosum become known as granular cells in this layer. |
| Cleavage Lines | When more collagen fibers are oriented in some directions. |
| Dermis | Layer of skin just below the epidermis. It is dense connective tissue. |
| Hair Shaft | Above the surface of the skin. |
| Follicle (Bulb Matrix) | Below the surface of the skin. |
| Stratum Basal | Deepest layer of the epidermis. Cuboidal or columnar cells that divide every 19 days. |
| Nerve Receptor | Specialized to sense or receive stimuli. |
| Sebaceous Gland | Produce sebum; Oily and white substance composed of lipids. |
| Sweat Gland (Sudoriferous) | Apocrine and merocrine; Largely water and salt. |
| Arrector Pili Muscles | Smooth muscle cells that cause hair to stand up |
| Dermal Papilla | Projections of the upper part of the dermis; Contain many blood vessels that supply the epidermis with nutrients. These are what form fingerprints and footprints in the epidermis. |
| Superficial Fascia (Hypodermis) | Located under the dermis. It stores fat for padding and insulation. |
| Cutaneous Membrane | An epidermis membrane. |
| Rickets (Vitamin D) | A disease of children caused by vitamin D deficiency, characterized by imperfect calcification, softening, and distortion of the bones typically resulting in bow legs. |
| Keratin | A fibrous protein forming the main structure of hair. |
| Melanin | A dark brown to black pigment occurring in the hair, skin, and iris of the eye in people. It is responsible for tanning of skin exposed to sunlight. |
| Changes in Skin with Age | Reduced blood flow to skin; Skin becomes thinner and more transparent; Decrease in the amounts of collagen fibers, so the skin is easily damaged and repairs slowly |
| Burns | 1st degree- only the epidermis 2nd degree- damages the epidermis and dermis 3rd degree- completely damages the epidermis and dermis |
Created by:
BrittD2015
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