Glands

thumb|right|202px| Animation of the migration of spermatozoa from their origin as germ cells to their exit from the vas deferens. A) Blood vessels; B) Head of [[epididymis; C) Efferent ductules; D) Seminiferous tubules; E) Parietal lamina of tunica vaginalis; F) Visceral lamina of tunica vaginalis; G) Cavity of tunica vaginalis; H) Tunica albuginea; I) Lobule of testis; J) Tail of epididymis; K) Body of epididymis; L) Mediastinum testis; M) Vas deferens.]] A testicle, also called testis ( testes) is the male gonad in all gonochoric animals, including humans, and is homologous to the ovary, whi

alt=3D medical animation still showing structure of as well as location of the spleen in human body|thumb|A 3D medical animation still of spleen structure and exact location

A gland is a cell or an organ in an animal's body that produces and secretes different substances that the organism needs, either into the bloodstream or into a body cavity or outer surface. A gland may also function to remove unwanted substances such as urine from the body.

The nipple is a raised region of tissue on the surface of the breast from which, in lactating females, milk from the mammary gland leaves the body through the lactiferous ducts to nurse an infant. The milk can flow through the nipple passively, or it can be ejected by smooth muscle contractions that occur along with the ductal system. The nipple is surrounded by the areola, which is often a darker colour than the surrounding skin.

The prostate is an accessory gland of the male reproductive system and a muscle-driven mechanical switch between urination and ejaculation. It is found in all male mammals. It differs between species anatomically, chemically, and physiologically. Anatomically, the prostate is found below the bladder, with the urethra passing through it. It is described in gross anatomy as consisting of lobes and in microanatomy by zone. It is surrounded by an elastic, fibromuscular capsule and contains glandular and connective tissue.

small endocrine gland found in most vertebrates, which produces melatonin; in humans, located in the epithalamus, in a groove where the two halves of the thalamus join; its shape and size resembles a pine nut, after which it is named

endocrine gland

exocrine gland in humans and other mammals

A gonad, sex gland, or reproductive gland is a mixed gland and sex organ that produces the gametes and sex hormones of an organism. Female reproductive cells are egg cells, and male reproductive cells are sperm. The male gonad, the testicle, produces sperm in the form of spermatozoa. The female gonad, the ovary, produces egg cells. Both of these gametes are haploid cells. Some hermaphroditic animals (and some humanssee Ovotesticular syndrome) have a type of gonad called an ovotestis.

small exocrine gland in the reproductive system of many male mammals

microscopic exocrine gland in the skin that secretes an oily or waxy matter, called sebum, to lubricate and waterproof the skin and hair of mammals

two glands located slightly posterior and to the left and right of the opening of the vagina

thumb|250px|Udder of a Cattle|cow An udder is an organ formed of two or four mammary glands on the females of dairy animals and ruminants such as cattle, goats, and sheep. An udder is equivalent to the breast in primates and other mammals. The udder is a single mass hanging beneath the animal, consisting of pairs of mammary glands with protruding teats. In cattle, camels and deer, there are normally two pairs, in sheep and goats, there is one pair, and in some animals, there are many pairs. In animals with udders, the mammary glands develop on the milk line near the groin. Mammary glands that

small tubular structures of the skin that produce sweat; a type of exocrine gland, which are glands that produce and secrete substances onto an epithelial surface by way of a duct

Lactation describes the secretion of milk from the mammary glands in addition to the period of time that a parent lactates to feed her young. The process can occur with all sexually mature female mammals, although it may predate mammals. The process of feeding milk in all female creatures is called nursing, and in humans it is also called breastfeeding. Newborn infants often produce some milk from their own breast tissue, known colloquially as witch's milk.

glands located on the anterior wall of the vagina

sebaceous glands in the areola surrounding the nipple

organ for getting rid of salt

mostly limited to the axilla (armpits) and perianal areas in humans; they are not significant for cooling in humans, but are the sole effective sweat glands in hoofed animals, such as the camels, donkeys, horses, and cattle

thumb|upright=1.2|Teats protruding from the udder of a [[cow]] thumb|upright=0.9|Part of a milking device that fits over the teats of a cow.

specialized sudoriferous glands located subcutaneously in the external auditory canal, in the outer 1/3; simple, coiled, tubular glands made up of an inner secretory layer of cells and an outer myoepithelial layer of cells; classed as apocrine glands

exocrine gland in the penis or clitoris

circumscribed channel leading from an exocrine gland or organ

exocrine glands found in most mammals

pair of salivary glands behind the nasal cavity

glands with a saclike secretory portion

fluid filled blister on the nipple

modified apocrine sweat gland on the margin of the eyelid

Type of gland

gland found in some snakes named for French zoologist Georges Louis Duvernoy

desalination gland in marine birds

Gland on the tail of certain mammals

anatomical entity

Gland that secretes serous fluid

Wikimedia list article

paired exocrine gland in many hoofed animals

secretary glands with tube-like shape

Glands in the digestive system