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| 31. | hair root | part of hair that is below the epidermis anchored to the follicle |
| 32. | hair shaft | part of hair that is above the epidermis but is not anchored to the follicle |
| 33. | hair | keratinous filament growing out of the epidermis |
| 34. | hypodermis | connective tissue connecting the integument to the underlying bone and muscle |
| 35. | hyponychium | thickened layer of stratum corneum that lies below the free edge of the nail |
| 36. | integumentary system | skin and its accessory structures |
| 37. | internal root sheath | innermost layer of keratinocytes in the hair follicle that surround the hair root up to the hair shaft |
| 38. | keloid | type of scar that has layers raised above the skin surface |
| 39. | keratin | type of structural protein that gives skin, hair, and nails its hard, water-resistant properties |
| 40. | keratinocyte | cell that produces keratin and is the most predominant type of cell found in the epidermis |
| 41. | keratohyalin | granulated protein found in the stratum granulosum |
| 42. | Langerhans cell | specialized dendritic cell found in the stratum spinosum that functions as a macrophage |
| 43. | lunula | basal part of the nail body that consists of a crescent-shaped layer of thick epithelium |
| 44. | Meissner corpuscle | (also, tactile corpuscle) receptor in the skin that responds to light touch |
| 45. | Merkel cell | receptor cell in the stratum basale of the epidermis that responds to the sense of touch |
| 46. | medulla | in hair, the innermost layer of keratinocytes originating from the hair matrix |
| 47. | melanin | pigment that determines the color of hair and skin |
| 48. | melanocyte | cell found in the stratum basale of the epidermis that produces the pigment melanin |
| 49. | melanoma | type of skin cancer that originates from the melanocytes of the skin |
| 50. | melanosome | intercellular vesicle that transfers melanin from melanocytes into keratinocytes of the epidermis |
| 51. | metastasis | spread of cancer cells from a source to other parts of the body |
| 52. | nail bed | layer of epidermis upon which the nail body forms |
| 53. | nail body | main keratinous plate that forms the nail |
| 54. | nail cuticle | fold of epithelium that extends over the nail bed, also called the eponychium |
| 55. | nail fold | fold of epithelium at that extend over the sides of the nail body, holding it in place |
| 56. | nail root | part of the nail that is lodged deep in the epidermis from which the nail grows |
| 57. | Pacinian corpuscle | (also, lamellated corpuscle) receptor in the skin that responds to vibration |
| 58. | papillary layer | superficial layer of the dermis, made of loose, areolar connective tissue |
| 59. | reticular layer | deeper layer of the dermis; it has a reticulated appearance due to the presence of abundant collagen and elastin fibers |
| 60. | rickets | disease in children caused by vitamin D deficiency, which leads to the weakening of bones |
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