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Sebaceous gland

Sebaceous glands are usually associated with hair follicles and thus do not occur in thick skin. They are classified as simple, branched acinar glands because they consist of an unbranched duct into which multiple, acinar secretory units secrete. Sebaceous glands secrete sebum, a thick oily material, by the holocrine mode of secretion into the upper portion of hair follicles. Sebum helps moisturize and protect the skin. 600x

Acini > <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

Acini >

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

- Proliferating cells <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

- Proliferating cells

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

- Lipid accumulating cells <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

- Lipid accumulating cells

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

- Dead cells <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

- Dead cells

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

Duct <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

Duct

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

Sebum <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

Sebum

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

Hair follicle <p>Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.</p>

Hair follicle

Cells at the periphery of the acini proliferate and, as they are pushed toward the center of the acinus, accumulate lipid (sebum) and degenerate, eventually filling the center of the acinus. These dead cells, and the sebum they contain, are released into a short duct opening onto the hair shaft.

Main Slide Acini > - Proliferating cells - Lipid accumulating cells - Dead cells Duct Sebum Hair follicle