Sebaceous glands are present on all skin surfaces except on the palms, soles, lips, and parts of the external genitalia.
Sebaceous glands are part of the pilosebaceous unit. There are generally numerous sebaceous glands per each hair follicle. Sebaceous glands are true exocrine glands made up of lobules and ducts.
The lobules are made up of sebaceous cells which produce sebum, a fatty substance that lubricates hair and has bactericidal and fungicidal properties.
These sebaceous or oil glands are also classified as holocrine exocrine glands. It means that the entire sebaceous cell loses its cytoplasm and dies in the process of discharging its contents during the excretory process toward the middle of the gland into its lumen.
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