uropygial gland

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uropygial gland

(yo͝or′ə-pī′jē-əl, -pĭj′ē-)
A large gland at the base of a bird's tail that secretes an oil used in preening. Also called oil gland.

oil gland

Sebaceous glands; glandulae sebaceae [NA].
The secretory unit in certain birds responsible for producing and deploying lipid moieties required for “waterproofing” water fowl.


an aggregation of cells specialized to secrete or excrete materials not related to their ordinary metabolic needs. Glands are divided into two main groups, endocrine and exocrine.
Specific glands will be found under their individual names.

accessory genital g's
glands other than the gonads, intimately associated with the reproductive organs, especially of the male, in which they include vesicular glands (seminal vesicles), ampullary glands, prostate, bulbourethral glands, coagulating glands. Called also accessory sex glands.
accessory sex gland
see accessory genital glands (above).
acinous gland
one made up of one or more oval or spherical sacs (acini).
alveolar gland
one whose secretory units consist of saclike dilatations with a distinct lumen.
alveolar-tubular gland
gland composed of a mixture of alveolar and tubular structures.
ampullary gland
fusiform enlargement of the deferent duct, as it passes across the bladder wall, due to proliferation of glandular tissue in the regionally folded mucosa.
anal g's
small glands in the anal columnar mucosal cells plus larger and more numerous circumanal glands in the surrounding skin.
apocrine gland
one whose discharged secretion contains part of the secreting cells.
avian stomach g's
mucosal and submucosal glands in the stomach of birds; the submucosal glands are thought to secrete both acidic and enzymic substances.
bronchial g's
glands which contain a mixture of serous and mucus-secreting cells found in the bronchial mucosa.
buccal g's
buccal salivary glands lying in the submucosal tissues of the cheek and sometimes the orbit and whose ducts secrete directly into the buccal cavity.
cardiac gland
one of the three (the other two are the pyloric and proper gastric or fundic) types of gland in the stomach wall and capable of secretion into the gastric juices; this gland secretes only mucus.
carpal g's
cutaneous, 'marking' glands found on the medial aspect of the carpus in the pig; although present in both sexes are thought to be used to mark mated females.
circumoral g's
large glands in the lips of cats; used to mark territory either directly by the familiar fawning head rub, or indirectly by rubbing the secretion of the gland onto the fur during grooming.
ceruminous g's
cerumin-secreting glands in the skin of the external auditory canal.
compound gland
one made up of a number of smaller units whose excretory ducts combine to form ducts of progressively higher order.
deep (lacrimal) gland, gland of the third eyelid
an additional lacrimal gland found in the skin of the cartilaginous support of the third eyelid.
ductless g's
endocrine glands.
eccrine gland
a gland that secretes its product without loss of cytoplasm, such as the sweat glands on dog footpads or human skin.
endocrine g's
or ductless glands, discharge their secretions (hormones) directly into the blood; they include the adrenal, pituitary, thyroid and parathyroid glands, the islets of Langerhans in the pancreas, the gonads and the pineal body.
exocrine g's
discharge through ducts opening on an external or internal surface of the body; include the salivary, sebaceous and sweat glands, the liver, the gastric glands, the pancreas, the intestinal, mammary and lacrimal glands, and the prostate.
fundic g's, fundus g's
numerous, tubular glands in the mucosa of the stomach that contain the cells which produce acid and pepsin. According to the species, they are usually found in the body and occasionally in the fundus.
gustatory gland
branched, tubuloalveolar serous glands which open into large lingual papillae.
hematopoietic gland
glandlike body, e.g. the spleen, that takes a part in blood formation.
hemolymph gland
small node resembling lymph node but red or brown in color and containing blood sinuses instead of or alongside lymph spaces. Common in ruminants and some rodents and typically located along the large arteries.
Harderian gland
haversian gland
fold on synovial surface regarded as secretor of synovia.
holocrine gland
one whose discharged secretion contains the entire secreting cells as in sebaceous glands.
horn gland
a scent gland found caudomedial to the horn base in goats of both sexes; increase in size and activity in breeding season. Produce the pungent secretion so characteristic of goats, described best as the distilled essence of reek.
infraorbital g's
special sebaceous glands which line the infraorbital sinus (pouch) in sheep.
inguinal g's
the collection of special tubular and sebaceous glands which line the inguinal pouch (sinus) in sheep.
interdigital g's
special sebaceous and tubular glands in the interdigital sinus (pouch) in sheep.
intestinal g's
microscopic tubular glands which lie in the mucosa of the gut and secrete intestinal juice into the lumen of the small intestine.
labial g's
minor salivary glands; mucous in small ruminants, serous in others.
lateral nasal g's
a local glandular thickening of the mucosa lining the maxillary sinus of dogs and some other species; this tissue is largely responsible for the continually wet nose of the dog.
lingual gland
minor salivary glands, mixed serous and mucous in cattle and horses, mucous in sheep, cats, dogs.
lymph g's
lymph nodes; they are not glands in the true sense.
male sex gland
see testis, accessory genital glands (above).
mammary gland
the milk-secreting organ of female mammals, existing also in a rudimentary state in the male. See also udder, breast.
mandibular salivary g's
major salivary glands; large and with long salivary ducts to deliver secretion into the mouth.
marrow-lymph gland
hemolymph gland having a marrow-like tissue.
meibomian gland
see tarsal gland.
mental gland
a focal specialization of glands in the skin of the pig, caudal to the mandibular symphysis. It is a round raised nevus-like structure composed of sebaceous and apocrine glands with coarse bristles.
merocrine gland
one whose discharged secretion contains no part of the secreting cells.
mixed g's
1. seromucous glands.
2. glands that have both exocrine and endocrine portions.
molar salivary gland
unique gland in felids; predominantly mucoid cells with a few serous.
Moll's g's, g's of Moll
multicellular g's
glands which occur as sheets of epithelial cells with secretory function, e.g. gastric and intestinal mucosae.
multilobular proventricular g's
in the glandular stomach of the bird these glands appear to secrete both pepsin and hydrochloric acid.
nasal g's
small glands scattered throughout the nasal mucosa.
nasolabial gland
see nasolabial gland.
olfactory g's
seromucous glands located beneath the olfactory epithelium; their secretion keeps the local mucosa moist.
palatine salivary gland
a minor salivary gland containing serous or mucoid or mixed secretory cells.
palpebral gland
see meibomian gland (above).
parotid salivary gland
a major salivary gland usually containing serous secretory cells; in carnivores there may also be a few mucus-secreting cells.
preen gland
see uropygial gland (below).
preputial g's
sebaceous and apocrine sweat glands within the prepuce; sometimes aggregated into discrete sacs (musk deer) or diverticula (pigs); their secretions combine with desquamated epithelial cells to produce smegma.
proctodaeal g's
mucous glands containing lymphoid tissue located in the proctodeum of male and female birds.
proper gastric gland
the main digestive glands of the stomach; found in different parts of the stomach in different species but usually in the body of the stomach; secrete pepsin and hydrochloric acid; open into microscopic pits and clefts.
scent gland
secrete pheromones which play such a large part in olfactory communication between animals. Located in a variety of places, e.g. in the elephant they are behind the eyes, in the musk deer they are in the belly wall.
seminal gland
see seminal vesicle.
sentinel gland
an enlarged lymph node, considered to be pathognomonic of some pathological condition elsewhere.
sex g's, sexual g's
gonads. See ovary, testis.
shell gland
the caudal portion of the uterus in the female bird in which the egg is held while the shell is secreted.
simple gland
one with a nonbranching duct.
sine ductibus gland
ductless gland.
solitary g's
solitary follicles.
sperm host gland
in the vagina of birds; store and nourish visiting spermatozoa which are released when oviposition occurs.
splenolymph g's
hemolymph glands having more of the splenic type of tissue.
sublingual salivary gland
a major salivary gland; predominantly mucous cells in ruminants, swine, rodents; mixed serous and mucoid cells in small carnivores and horses.
submental g's
a group of sebaceous glands in the intermandibular space in cats.
submucosal intestinal g's
simple, branched, tubuloacinar glands; mucous in ruminants and dogs, mixed serous and mucous in cats and serous in horses and dogs; in carnivores and small ruminants confined to the proximal or middle parts of the duodenum, extend to jejunum in large ruminants, horses, pigs.
submucosal stomach gland
large, numerous, branched, compound, tubular gland in birds; thought to secrete both acid and enzymatic products.
sudoriferous g's, sudoriparous g's
sweat glands.
supracaudal gland
scent producing cells found only in dogs and cats; in dogs confined to a small area at the base of the tail, in cats extend along the dorsal surface of most of the tail; called also tail gland.
suprarenal gland
tail gland
see supracaudal gland (above).
target gland
one specifically affected by a hormone.
tarsal gland
see meibomian gland (above).
third eyelid gland
a secondary lacrimal gland; a second, deeper gland occurs in pigs and cattle.
tubular gland
any gland made up of or containing a tubule or tubules.
ultimobranchial gland
tissue from the fourth pharyngeal pouch which in mammals is absorbed into the thyroid gland. In fish, amphibians, reptiles and birds the tissue forms separate glands containing calcitonin.
unicellular gland
a single cell that functions as a gland, e.g. a goblet cell.
urethral g's
accessory sex glands in males; secrete serous and mucoid liquids into the urethra to nourish and activate spermatozoa.
uropygial gland
the oil or preen gland of birds is attached to the tail and consists of a bilobed simple tubular, holocrine gland.
vesicular gland
see seminal vesicle.
vestibular g's
major and minor mucus-producing glands in the vestibule of the vulva.
Wolfring g's
small tubuloalveolar glands in subconjunctival tissue above the upper border of the tarsal plate; open onto conjunctiva.
g's of Zeis, Zeis g's
prominent sebaceous sweat glands on the eyelid margins, associated with hair follicles of cilia. See also external hordeolum.
Zuckerkandl gland
two large bodies included with the paraganglia along the abdominal aorta.
zygomatic salivary gland
a unique salivary gland in small carnivores; contains mainly mucous cells with a few serous cells; a modified dorsal buccal gland.
References in periodicals archive ?
Since waterbirds use to spread preen oil over their own (self-preening) or other birds' (allo-preening) plumage, it is easily understandable how these preening activities could facilitate the diffusion of the viruses in nature.
The study, of organic compounds present in the preen oils of Dark-eyed Juncos, was carried out by researchers at the Indiana University Bloomington, US.