melanocyte
Noun: A specialized cell located in the basal layer of the epidermis (the bottom layer of the skin) and in other areas, such as hair follicles and the eye. Its primary function is to produce and store the pigment melanin, which gives color to the skin, hair, and eyes and provides some protection against ultraviolet radiation. Its activity is regulated by hormones, including melanocyte-stimulating hormone (MSH).
The word "melanocyte" is a scientific and medical term. It is used to describe the specific biological cell responsible for pigmentation. - It functions as a countable noun (e.g., a melanocyte, several melanocytes). - It is typically used in contexts related to biology, dermatology, anatomy, and medicine.
- Basic Usage:
- Each melanocyte produces melanin granules.
- The number of melanocytes in human skin is roughly the same across different ethnicities; the difference in skin color is due to the amount and type of melanin produced.
- In Context:
- Exposure to sunlight stimulates the melanocytes to produce more melanin, resulting in a tan.
- Albinism is a condition characterized by a lack of melanin production by melanocytes.
- Melanocyte Transplantation: A medical procedure where healthy melanocytes are transferred to areas of skin that have lost pigment, such as in vitiligo.
- Melanocyte-Stimulating Hormone (MSH): The hormone that signals melanocytes to produce melanin.
- Melanin (noun): The dark pigment produced by melanocytes.
- Melanogenesis (noun): The biochemical process of melanin production within melanocytes.
- Melanoma (noun): A serious type of skin cancer that originates from melanocytes.
- Pigment cell: A more general term, though not exclusively synonymous, as other cells can also contain pigment.
The term refers exclusively to the pigment-producing cell. It does not refer to the pigment itself (which is melanin) or to the resulting color. Its core meaning is tied to its biological function and location.
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a cell in the basal layer of the epidermis that produces melanin under the control of the melanocyte-stimulating hormone
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