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Sweat glands (also known as sudorif­er­ous or sudori­parous glands, ), are small tubu­lar struc­tures of the skin that pro­duce sweat. There are two main types of sweat glands that dif­fer in their struc­ture, func­tion, secre­to­ry prod­uct, mech­a­nism of excre­tion, anatom­ic dis­tri­b­u­tion, and dis­tri­b­u­tion across species: Eccrine sweat glands are dis­trib­uted almost all over the human body, in vary­ing den­si­ties. Its water-based secre­tion rep­re­sents a pri­ma­ry form of cool­ing in humans. Apoc­rine sweat glands are most­ly lim­it­ed to the axil­la (armpits) and peri­anal areas in humans. They are not sig­nif­i­cant for cool­ing in humans, but are the sole effec­tive sweat glands in hoofed ani­mals, such as the camels, don­keys, hors­es, and cat­tle. Ceru­mi­nous glands (which pro­duce ear wax), mam­ma­ry glands (which pro­duce milk), and cil­iary glands in the eye­lids are mod­i­fied apoc­rine sweat glands.