摘要: The tear film consists of three layers: an outer lipid layer, a middle aqueous and inner mucous layer. numerous glands that surround the eye — various types orbital each contribute to film. meibomian lesser extent Zeis Moll secrete lipids main lacrimal gland secretes layer with additional minor contribution from accessory (the Kraus Wolfring). goblet cells some crypts Henle Manz This chapter will focus mainly on two aspects production: neuroendocrine regulation secretion cellular mechanism secretion.