Sebaceous glands


 Sebaceous glands


Sebaceous glands :

The sebaceous glands are pear or flask shaped small glands situated in the dermis, whose openings are found near hair follicles.        The sebaceous glands are pear or flask shaped small glands situated in the dermis, whose openings are found near hair follicles. The oily fluid (substance) secreted from them is called sebum. The production of sebum depends on the changes of skin. There is no any control of nervous system found on it. The contraction of arrector pilorum muscle is helpful in the discharge of sebum. Fatty acid and cholesterol are present additionally in sebum along with chemical substance named argosterol that is converted into vitamin ‘D’ after coming in contact of ultraviolet rays. The sebum keeps the skin and hairs smooth, soft and shiny. It also acts as bacteriostatic. 

     In addition to palms and soles, the sebaceous glands are also found in the skin of all the body parts. It is also responsible for dense hairs.  

     Such types of glands are found more on those body parts having extra hairs. The hairs and skin are become dry in absence of sebum and due to excessiveness of it; a thin layer is appeared on the skin that goes on falling down later. Dandruff on the head is the best example of it. In childhood, sebaceous glands are comparatively less active. Like this, they are also less active in old age, due to which the secretion of sebum is decreased and the skin as well as hairs remains dry.