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uropygial gland - traduction vers arabe
![Blue Jay]]](https://commons.wikimedia.org/wiki/Special:FilePath/Blue Jay anting, showing uropygial gland.jpg?width=200 "Blue Jay]]")
![[[Hoopoe]]s host symbiotic bacteria in their uropygial glands whose secretions act against feather-degrading bacteria.](https://commons.wikimedia.org/wiki/Special:FilePath/Common Hoopoe (Upapa epops) at Puri Im IMG 9204.jpg?width=200 "[[Hoopoe]]s host symbiotic bacteria in their uropygial glands whose secretions act against feather-degrading bacteria.")
![preening]]. The bird on the left is pushing its head towards its uropygial gland.](https://commons.wikimedia.org/wiki/Special:FilePath/Glande uropygienne.jpg?width=200 "preening]]. The bird on the left is pushing its head towards its uropygial gland.")
![[[White-winged crossbill]] (''Loxia leucoptera'') extracting preen oil from its uropygial gland.](https://commons.wikimedia.org/wiki/Special:FilePath/White-winged Crossbill Uropygial.JPG?width=200 "[[White-winged crossbill]] (''Loxia leucoptera'') extracting preen oil from its uropygial gland.")
![glans]] of a human [[penis]]](https://commons.wikimedia.org/wiki/Special:FilePath/Pre cum 160717.jpg?width=200 "glans]] of a human [[penis]]")
Définition
Wikipédia
The uropygial gland, informally known as the preen gland or the oil gland, is a bilobed sebaceous gland possessed by the majority of birds used to distribute the gland's oil through the plumage by means of preening. It is located dorsally at the base of the tail (between the fourth caudal vertebra and the pygostyle) and is greatly variable in both shape and size. In some species, the opening of the gland has a small tuft of feathers to provide a wick for the preen oil (see below). It is a holocrine gland enclosed in a connective tissue capsule made up of glandular acini that deposit their oil secretion into a common collector tube ending in a variable number of pores (openings), most typically two. Each lobe has a central cavity that collects the secretion from tubules arranged radially around the cavity. The gland secretion is conveyed to the surface via ducts that, in most species, open at the top of a papilla (nipple-like structure).
