The eyelids may be divided into anterior and posterior parts by the mucocutaneous junction
- the grey line (Figure 2.8). The eyelashes arise from hair follicles anterior to the grey line,while the ducts of the meibomian glands (modified sebaceous glands) open behind the grey line. The meibomian glands are long and slender, and run parallel to each other, perpendicular to the eyelid margin, and are located in the tarsal nasolacrimal duct opens into the inferior meatus of the nose.
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