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'''Mammary glands''' or '''mammae,''' are organs which, in female mammals, are developed to secrete milk for feeding young. In humans, they are located on the breast, i.e. the upper anterior part of the chest, and are individually called '''breasts.'''

'''Mammary glands''' or '''mammae,''' are organs which, in female mammals, are developed to secrete milk for feeding young. In humans, they are located on the breast, i.e. the upper anterior part of the chest, and are individually called '''breasts.''' In other mammals, the location and number varies with the species.

In medical and zoological parlance, both female and male mammals have breasts, but those in females develop and enlarge in size at adulthood while those of males remain rudimentary. [[histology|Histologically]] and developmentally, mammary glands are modified sweat glands.<ref>Bhatnagar, S. M. (2000), ''Essentials of Human Embryology,'' p. 223, "The Integumentary System:" "The mammary glands are regarded as modified sweat glands and hence are described here."</ref>

In medical and zoological parlance, both female and male mammals have breasts, but those in females develop and enlarge in size at adulthood while those of males remain rudimentary. [[histology|Histologically]] and developmentally, mammary glands are modified sweat glands.<ref>Bhatnagar, S. M. (2000), ''Essentials of Human Embryology,'' p. 223, "The Integumentary System:" "The mammary glands are regarded as modified sweat glands and hence are described here."</ref>