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Test 3 chpt. 5 part
hair, nails of chpt. 5,
| Question | Answer |
|---|---|
| Root plexus. | a network of sensory nerves that surround the base of each hair follicle. |
| Erector pili. | smooth muscle cell bundle that contacts and makes hair stand up. |
| Hair root. | the portion of the hair that anchors the hair into the skin. |
| Hair shaft. | the part of the hair halfway from the surface or the skin to the tip of the hair. |
| Hair papilla. | a peg of connective tissue containing capillaries and nerves. |
| Hair bulb. | a cap that is made up of a mass of epithelial cells. |
| Hair matrix. | the superficial layer of cells of the hair bulb responsible for producing the hair. |
| Medulla. | the core of the hair made up of the daughter cells close to the center of the matrix. |
| Cortex. | Intermediate layer of the hair. |
| Cuticle. | the surface of the hair. |
| Internal root sheath. | surrounds the hair root and deeper portion of the shaft. |
| External root sheath. | extends from the skin surface to the hair matrix. |
| Glassy membrane. | a thickened clear layer wrapped in a dense connective tissue sheath. In contact with surrounding connective tissues of the dermis. |
| The hair growth cycle. | hairs grow and are shed according to a continuous cycle. |
| Club hair | at the end of the growth cycle this is what the hair is called. |
| Vellus hairs. | are fine "peach fuzz" hairs located over much of the body surface. |
| Terminal hairs. | are heavy, more deeply pigmented and sometimes curly. They include eyebrows, lashes, pubic hair, armpit hair, and head hair. |
| Nail function. | protect the exposed dorsal surfaces of the tips of the fingers and toes. |
| Nail body. | the visible portion of the nail. |
| Nail bed. | the epidermal area covered by the nail body. |
| Nail grooves and folds. | the depressions around the nail body. |
| Free edge (of nail) | distal portion of the nail body that continues passed the nail bed. |
| Hyponychium. | under free area (at the tip of the finger); thickened area of the stratum corneum. |
| Nail root. | an epidermal layer fold not visible from the surface. |
| eponychium or cuticle | portion of the stratum corneum that extends over the exposed nail. |
| Lunula. | an area near the root where blood vessels may be obscured, leaving this pale cresent. |
| Scab. | forms at the surface temporarily to restore the integrity of the the epidermis and restricts entry of additional microorganisms. |
| granulation tissue. | combination of blood clot, fibroblasts, and an extensive capillary network. |
| scar tissue | formation of rather flexible, fibrous, noncellular tissue after injury. However it fails to restore tissue to its original condition. |
| keloid | area of raised fibrous scar tissue. |
| some components of aging in the Integumentary system | epidermis thins; number of dendritic cells decreases; vitamin D3 production declines; melanocyte activity declines; glandular activity declines; blood supply to the dermis is reduced; hair follicles stop functioning or produce thinner, finer hairs; dermis |
Created by:
Willbill
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