Which glands are found in the tarsus of the eyelid?

The tarsus of the eyelid, which is the dense connective tissue core of the eyelid, contains Meibomian glands. These glands are classified as modified sebaceous glands and are primarily responsible for secreting meibum, an oily substance that is a critical component of the tear film. The meibum helps reduce tear evaporation and provides a protective barrier on the surface of the eye, contributing to overall ocular health.

In contrast, sebaceous glands are not exclusively located in the tarsus; they are distributed throughout the skin. Salivary glands are located in the oral cavity and have no role in the eyelid structure. Lacrimal glands are responsible for the production of the aqueous component of tears but are situated above the eye and not within the eyelid itself. Thus, the presence of the Meibomian glands in the tarsus distinctly identifies them as the correct answer, given their specific function and location.