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Chapter 5
Integumentary System 5.1-5.2
| Term | Definition |
|---|---|
| Two layers of the skin | Epidermis and dermis |
| Hypodermis | They layer of tissue found beneath the skin. |
| Epidermis | The thin outer layer of the skin. |
| Keratinocytes | Produce keratin for waterproofing the skin. Found in the stratum basale. |
| Langerhans cells | These cells are a type of white blood cell that aid in immunity and signaling the immune system. |
| Melanocytes | A special cell that produces melanin. Melanin is the pigment that gives skin its color. |
| Tactile cells (Merkel Cells) | These cells signal that something has touched the skin. |
| Dermis | The dermis is a deep and thick region of the skin. The dermis contains collagen and elastic fibers that give skin its strength and ability to stretch. |
| Hypodermis | This deep layer that lies beneath the skin is made of loose connective tissue, mostly fat, and this gives the body an energy supply, padding, and some degree of insulation. |
| Hair Follicle | The region that a hair projects from. |
| Hair Matrix | A constantly dividing region of cells that produces new keratinocytes to form new hair. |
| Alopecia | Hair loss |
| Arrector pili | A muscle found within the skin that causes hairs to stand up when someone is scared or cold. "Goose bumps" |
| Apocrine Glands | These are a type of sweat gland that open to hairs in certain body regions including the groin and armpits. |
| Eccrine Glands | A type of sweat gland that opens to the skin and secretes fluid when you are hot. Think "exercise=eccrine" |
| Ceruminous Glands | Glands found in the ear that produce cerumen (earwax). |
| Sebaceous Glands | These are glands that are associated with hairs. |
| Sebum | An oily substance that lubricates and softens both skin and hair. Sebum also kills some bacteria. |
| Acne Vulgaris | Inflammation of sebaceous glands. |
| Mammary Glands | Modified apocrine sweat glands that produce milk, but only after childbirth. |