What does SI mean? Definitions for SI Here are all the possible meanings and translations of the word SI.
The sebaceous glands are microscopic exocrine glands in the skin that secrete an oily or waxy matter, called sebum, to lubricate and waterproof the skin and hair of mammals.ebaceous glands secrete the oily, waxy substance called sebum (Latin: fat, tallow) that is made of triglycerides, wax esters, squalene, and metabolites of fat-producing cells. Sebum waterproofs and lubricates the skin and hair of mammals.
Oil glands ,also known as Sebaceous Glands ,blood vessels,sweat glands along with nerve endings are found in 2nd layer of skin ,which is called as Dermis.  u can not see it â¦ because DERMIS as it is under the OUTERMOST layer of skin called as EPIDERMIS.