Which type of gland secrete oily substances for skin lubrication?

Sebaceous glands are specialized glands located in the skin that are responsible for secreting oily substances known as sebum. Sebum serves multiple purposes, including lubrication of the skin and hair, which helps to maintain moisture and protect the skin from drying out and becoming more prone to injury. This oil also has antibacterial properties that help to keep the skin healthy by preventing infections.

The secretion from sebaceous glands typically empties into hair follicles, which is particularly important as it provides a natural barrier and contributes to the overall health of the skin and hair. This characteristic makes sebaceous glands distinct in their function compared to other gland types listed in the question.

Eccrine glands primarily focus on secreting a watery sweat to help regulate body temperature. Apocrine glands are associated with body odor and are found mainly in specific areas like the armpits and groin, producing a thicker secretion that becomes odoriferous when broken down by skin bacteria. Sudoriferous glands, synonymous with sweat glands, produce sweat but do not secrete oily substances intended for skin lubrication. Each of these glands has a unique role that differentiates them from sebaceous glands, which specifically provide the lubricating oil crucial for skin health.