Glandular or glandular sebaceous glands are located in the dermal layer of the skin. The channel through which they discharge their secretions opens in the hair follicle, on the side of the hair slope where the gland itself is located.
The development of Oily Glands
It is important to note that the degree of development of the gland (its size, sebum release) does not depend on the size of the hair itself, to which the follicles are attached.
An example is the skin of the nose, where even on the background of thinner and shorter hairs – the sebaceous glands that are located are significantly larger in size than other areas. Another example is ‘neo-colonized’ areas with a greater amount of sebaceous glands, such as the skin around the nipples of the breast and the oral corners.
The Meaning of Sebum Secretion
The oily secretion of the glands or the sebum is separated by the so-called holocrine way – the release of the secretion occurs in the destruction of the cells themselves that contain it.
These cells are part of the basal membrane of the gland, dividing them gradually into the upper layers of the canal, where they gradually fill with fat drops and their nuclei disappear.
The Sebum lubricates hands, skin & hair
The destruction of the cells in which the sebum(oily secretion of the sebaceous glands) secretion is due to the removal from the feeding capillaries – a natural necrosis process. Continuous secretion is ensured by constantly dividing these cells and pushing them toward the more superficial layers.
The secretion secreted by the sebaceous glands is related to the lubrication of the skin surface (in particular the upper layer of the epidermis), thus preventing it from cracking and subsequent irritations. In addition, the roots of the hair are lubricated, thus preventing the hair from breaking and drying.
During puberty, the production of sebaceous glands is intensified, which results in the removal of the collecting secretion and therefore accumulates in the glands and clogs them. This is accompanied by inflammation and the appearance of acne.
The accumulation and mixing of sebum, sweat, and effusive cells of the epidermis forms the so-called “cut” which is important to be periodically removed as it disrupts some of the skin’s functions – it reduces the evaporation of water, thereby disturbing the heat dissipation.