part of part of eyelid pilosebaceous unit sebaceous gland of eyelid gland of Zeis Glands of Zeis are unilobar sebaceous glands located on the margin of the eyelid. The glands of Zeis service the eyelash. These glands produce an oily substance that is issued through the excretory ducts of the sebaceous lobule into the middle portion of the hair follicle. gland of Zeiss SCTID:281070008 Zeis gland Wikipedia:Gland_of_Zeis gland of Zeis UBERON:0018233 FMA:59191 ciliary sebaceous gland of eyelid