Sebaceous glands
Sebaceous Glands
Sebaceous glands (/sɪˈbeɪʃəs/; from Latin sebaceus, meaning 'tallow-like') are small oil-producing glands present in the skin of mammals. They are part of the integumentary system, the organ system that protects the body from various kinds of damage.
Function
Sebaceous glands produce and secrete sebum, a waxy, oily substance that helps to lubricate and waterproof the skin and hair of mammals. The glands are usually associated with hair follicles but can also be found in hairless areas of the skin.
Anatomy
Sebaceous glands are typically located in the dermis, the layer of skin between the epidermis (outer layer) and subcutaneous tissue. They are most abundant on the face and scalp, but also appear on all parts of the skin except the palms of the hands and soles of the feet.
Clinical significance
Disorders of the sebaceous glands can lead to various skin conditions, such as acne, seborrheic dermatitis, and sebaceous cysts. Overactive sebaceous glands can result in excessive oil production, leading to oily skin and acne. Conversely, underactive glands can lead to dry skin.
Etymology
The term "sebaceous" is derived from the Latin word sebaceus, meaning 'tallow-like'. This refers to the waxy, oily nature of the substance produced by these glands.
Related terms
- Sebum: The oily substance produced by sebaceous glands.
- Acne: A skin condition that occurs when hair follicles become plugged with oil and dead skin cells.
- Seborrheic dermatitis: A common skin condition that mainly affects the scalp, causing scaly patches, red skin, and stubborn dandruff.
- Sebaceous cyst: A small, noncancerous lump under the skin, which can be caused by swollen hair follicles or skin trauma.
External links
- Medical encyclopedia article on Sebaceous glands
- Wikipedia's article - Sebaceous glands
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