Sebaceous glands, also known as oil glands, secrete oil. These are simple branched areolar glands that function as holocrine glands, meaning they release their oily product, sebum, by rupturing their cells. Sebum lubricates the hair and skin, preventing dryness and cracking.
Types of Oil Glands and Their Functions
Several types of glands contribute to oil secretion in the body:
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Sebaceous glands: Primarily found throughout the skin, except for the palms and soles, these glands are most associated with oil production. Their secretion, sebum, keeps the skin and hair moist and supple. As we age, sebaceous glands produce less oil. Source: MedlinePlus Medical Encyclopedia
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Meibomian glands: Located along the edges of the eyelids, these oil glands produce an oily substance that is a crucial component of the tear film, preventing evaporation and maintaining eye lubrication. Source: American Academy of Ophthalmology
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Glands in other animals: Even some animals, such as otters, have specialized skin glands that secrete oil to waterproof their fur. Source: Minnesota DNR
The clogging of sebaceous glands can lead to acne, a common skin condition. Source: Johns Hopkins Medicine The relationship between sebaceous glands and hair follicles is noteworthy; apocrine sweat glands' ducts often enter the hair follicle, positioned superficially to the sebaceous gland. Source: StatPearls - NCBI Bookshelf
It's important to note that while sweat glands are also exocrine glands and secrete fluids, their primary function isn't oil secretion. Sweat is primarily water and electrolytes. Source: Cleveland Clinic Sebaceous glands, on the other hand, are specifically designed for the production and secretion of sebum, an oily substance. Source: Cleveland Clinic
