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• Section 15: Endocrine Glands.
• These cellular masses, designated as the ductless glands or glands of internal secretion, have during development lost their original connection with the epithelium of the free surface. ... The endocrine glands are essentially a vertebrate development, and any one of these hormonal substances has a similar action in all vertebrates with little or no species-specific function.
• Endocrine glands may appear as distinct organs (e. ... , the hypophysis and adrenal glands), may be found associated with exocrine glands (e. ... , pancreatic islets and the interstitial cells of the testes), may appear as mixed endocrine glands (e. ... , the thyroid and parathyroid glands), or may have cells so diffusely distributed that they are not usually considered as organs (e. ...
• Some endocrine glands are essential for life; these include the adrenal cortex, pancreatic islets, and the parathyroid glands. The other endocrine glands, although not essential for life, determine to a great extent the quality of ones life and the ability to adapt to stress. The endocrine glands, separately and in conjunction with the nervous system, are coordinators of body functions that maintain the organism in a viable homeostatic state.
• The structural/functional organization of the endocrine glands is diverse but distinctive. In general, all endocrine glands store their secretory products either within the cells of origin or within cellular follicles or sacs. ...
• An essential feature of the endocrine glands is the manner in which the secretory activity is regulated by a feedback mechanism. ...
• Specific details of the structure and function of the endocrine glands will be found in this section and, as appropriate, in the sections concerned with the digestive, urinary, male reproductive, female reproductive, and nervous systems.

• Sebaceous glands .

• Salivary Glands and Saliva.
• Saliva is produced in and secreted from salivary glands. The basic secretory units of salivary glands are clusters of cells called an acini. ...
• Small collecting ducts within salivary glands lead into larger ducts, eventually forming a single large duct that empties into the oral cavity. ...
• Most animals have three major pairs of salivary glands that differ in the type of secretion they produce: .
• parotid glands produce a serous, watery secretion .
• submaxillary (mandibular) glands produce a mixed serous and mucous secretion .
• sublingual glands secrete a saliva that is predominantly mucous in character .
• The basis for different glands secreting saliva of differing composition can be seen by examining salivary glands histologically. ...
• Acini in the parotid glands are almost exclusively of the serous type, while those in the sublingual glands are predominantly mucus cells. In the submaxillary glands, it is common to observe acini composed of both serous and mucus epithelial cells. ...
• Parasympathetic stimulation from the brain, as was well demonstated by Ivan Pavlov, results in greatly enhanced secretion, as well as increased blood flow to the salivary glands. ...
• Evaporative cooling: clearly of importance in dogs, which have very poorly developed sweat glands - look at a dog panting after a long run and this function will be clear. ...
• Diseases of the salivary glands and ducts are not uncommon in animals and man, and excessive salivation is a symptom of almost any lesion in the oral cavity. ...

• In many cases small microscopic glands occur all over the sk"> As I have discussed elsewhere on the Forum, one of the main means of defence in sea slugs is to have distasteful, sometimes toxic, chemicals stored in the body. In many cases small microscopic glands occur all over the sk"> .
• Defensive glands.
• TOP: Berthellina citrina, showing the white mantle glands in its skin. (magnified glands in background).
• LOWER: Mexichromis macropus, view of the underside showing the round opaque white mantle glands around the mantle edge.
• In many cases small microscopic glands occur all over the skin and exude secretions, when the animal is disturbed. There are more elaborate developmenst in some groups of animals in which the secretions are stored in larger specialised glands or sacs. ...
• • References: Acid Glands and Acid secretions. ...
• , 2004 (July 27) Defensive glands. ...
• Do chromodorid mantle glands have a pore?.
• Re: Defensive Glands in Hypselodoris.
• Defensive Glands in Hypselodoris.

• Mammal, salivary glands (Gross, Low).
• Most mammals have well developed PAROTID, MANDIBULAR and SUBLINGUAL salivary glands. ... Most of the salivary glands are derived embryologically from invaginations of the oral cavity epithelium. Birds can produce generous amounts of saliva which is discharged from several sets of salivary glands through barely visible openings. ...

• Home > News and Events > BBK magazine > Issue 17 > Glands of life.
• Glands of life.
• By 1900, however, this had given way to something rather more complex: the body was now seen to be governed partly by nerves but partly, in some respects more importantly, by blood-borne substances secreted by organs called ductless or endocrine glands. In 1905, the secretions of these glands - whose composition was still unknown - were named 'hormones' by British physiologist Ernest Starling.
• In Glands of Life: Gonads, Sex and Body, 1850-1950, I show how this 'new physiology' changed our conceptions of sex and the body. ...
• The revitalisation of the sex glands would not just restore sexual appetite, but muscularity, creativity and the enthusiasm of youth. ...
• For one thing, the sex glands secreted hormones of both sexes under normal conditions. ... This balance, it was found, depended on a range of glands, not simply on the testicles or the ovaries. All these glands are controlled by a master gland in the brain about which, at that point, little was known: the pituitary. ...
• Sex, then, was not just a chemical phenomenon - but the manifestation of a complex network of endocrine glands and the brain. ...
• I hope Glands of Life will appeal to anybody fascinated by the ways in which science has both transformed our understanding of who we are and encouraged us to dream of re-engineering our bodies, our natures, our very selves.
• His forthcoming book Glands of Life: Gonads, Sex and Body, 1850-1950 is out in 2006, published by University of Chicago Press.

•  Endocrine Glands & Their Hormones .
•   Introduction to Endocrine System | Characteristics of Hormones | Endocrine Glands | Unit Review and Quiz | .
• The endocrine system is made up of the endocrine glands that secrete hormones. Although there are eight major endocrine glands scattered throughout the body, they are still considered to be one system because they have similar functions, similar mechanisms of influence, and many important interrelationships. ...
• Some glands also have non-endocrine regions that have functions other than hormone secretion. ...
• Learn more about endocrine glands and their hormones by selecting one of the following topics. ...
• Pituitary & Pineal Glands .
• Thyroid & Parathyroid Glands .
• Other Endocrine Glands .

• Salivary Glands What's Normal, What's Abnormal .
• Salivary Glands .
• Where Are Your Salivary Glands?.
• The glands are found in and around your mouth and throat. We call the major salivary glands the parotid, submandibular, and sublingual glands. ...
• Besides these glands, there are many tiny glands called minor salivary glands located in your lips, inner cheek area (buccal mucosa), and extensively in other linings of your mouth and throat. Salivary glands produce the saliva used to moisten your mouth, initiate digestion, and help protect your teeth from decay. ...
• Obstruction: Obstruction to the flow of saliva most commonly occurs in the parotid and submandibular glands, usually because stones have formed. ... Unless stones totally obstruct saliva flow, the major glands will swell during eating and then gradually subside after eating, only to enlarge again at the next meal. Infection can develop in the pool of blocked saliva, leading to more severe pain and swelling in the glands. If untreated for a long time, the glands may become abscessed. ...
• It is possible for the duct system of the major salivary glands that connects the glands to the mouth to be abnormal. ...
• Infection: The most common salivary gland infection in children is mumps, which involves the parotid glands. ...
• You may have a secondary infection of salivary glands from nearby lymph nodes. ... In fact, many of these lymph nodes are actually located on, within, and deep in the substance of the parotid gland or near the submandibular glands. When these lymph nodes enlarge through infection, you may have a red, painful swelling in the area of the parotid or submandibular glands. ...

• The Thyroid and Parathyroid Glands: Introduction and Index.
• The thyroid gland also produces another hormone called calcitonin, and the parathyroid glands secrete parathyroid hormone. ...
• Core information on the thyroid and parathyroid glands and their hormones is presented in the following topics: .
• Functional Anatomy of the Thyroid and Parathyroid Glands .
• Advanced and supplemental information on the thyroid and parathyroid glands and the hormones they produce: .
• Histology of the Thyroid and Parathyroid Glands.
• Parathyroid Glands .

• Swollen glands .
• Neck lumps are common in children, and usually represent swollen lymph glands. ...
• When we are ill, many glands around the body can temporarily enlarge. ... It is normal for lymph glands to wax and wane in size over a period of a few weeks. ...

• The Paraurethral, or "Skene's Glands" .
• The most widely known depiction of the paraurethral or Skene's Glands is the 1953 drawing by Frank H. ... )  Compared with other depictions, Netter shows the glands as smaller in size and number, and located primarily in the distal portion. ...
• The paraurethral glands are shown here in green surrounding the distal urethra, in the center of the drawing. ...
• Drawing of wax model of adult human female urethra with its paraurethral ducts and glands as seen in right lateral view. ... The smaller diagrams demonstrate transverse sections through the urethra, the paraurethral ducts and glands, and the vaginal canal beneath the urethra at different levels above the meatus. ... At the midpoint in the urethra many ducts and glands extend laterally far from the canal; at a more proximal level the urethra is surrounded by many small tubules, and on the right it is encompassed by a thin, compact semicircular sheet of ducts and glands. ...
• Contrary to some critics, the existence of the paraurethral glands has been well known for centuries, even in western medicine. ...

• Painful swelling of the salivary glands.
• Can you give me some possible ideas of what these symptoms might mean? Could I have some kind of infection in the salivary glands or some problem connected with the taste buds?.
• Saliva is produced by four very large glands (the parotid and submandibular glands, one on each side), two not-so-large glands (the sublingual glands), and a few thousand microscopic "minor salivary glands" that are scattered throughout the oral cavity, nasal cavity and throat. The submandibular glands are located beneath your lower jaw (the mandible– hence the name, "sub-mandibular"). ...
• Why do you notice it only when you eat certain foods? The taste of food (even the sight or smell of food) causes tiny muscles distributed throughout the salivary glands to contract, squeezing saliva from each gland. ...
• In most cases, the obstruction is due to one of three things: (1) a stone lodged within the main duct (not unlike the kidneys or bladder, salts can precipitate in the salivary glands, forming small stones); (2) scarring of the main duct, due to trauma or previous infection (the medical term for scarring which narrows a duct is stricture); (3) infection or other inflammation of the gland itself, which causes extrinsic pressure on the duct, pinching it off. ...

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