Name the two gland types associated with the eyelid margin and their secretions.

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Multiple Choice

Name the two gland types associated with the eyelid margin and their secretions.

Explanation:
At the eyelid margin, two glands sit right at the base of the eyelashes: the glands of Moll and the glands of Zeis. The glands of Moll are apocrine sweat glands, so their secretion is a watery, sweat-like fluid that helps keep the margin moist. The glands of Zeis are sebaceous glands, producing sebum, an oily substance that coats the eyelashes and lubricates the lid margin to reduce friction during blinking. (For context, Meibomian glands also lie along the lid margin and secrete lipids that form the tear film’s oily layer, but they are a different gland type from these two.)

At the eyelid margin, two glands sit right at the base of the eyelashes: the glands of Moll and the glands of Zeis. The glands of Moll are apocrine sweat glands, so their secretion is a watery, sweat-like fluid that helps keep the margin moist. The glands of Zeis are sebaceous glands, producing sebum, an oily substance that coats the eyelashes and lubricates the lid margin to reduce friction during blinking. (For context, Meibomian glands also lie along the lid margin and secrete lipids that form the tear film’s oily layer, but they are a different gland type from these two.)

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