Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Harderian gland is a gland found within the eye's orbit which occurs in vertebrates (reptiles, amphibians, birds and mammals) that possess a nictitating membrane. The gland can be compound tubular or compound tubuloalveolar, and the fluid it secretes (mucous, serous or lipid) varies between different groups of animals. In some animals it acts as an accessory to the lacrimal gland, secreting fluid that eases movement of the nictitating membrane.
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