Salivary glands are glands that produce and secrete saliva. Basic units of salivary gland secretion is a group of cells called acini. These cells secrete a fluid containing water, electrolytes, mucus and enzymes, all of which flow out of the collecting ducts to acini.
In the channel, the composition of the altered secretion. Most of the sodium is actively reabsorbed, potassium is released, and a large amount of bicarbonate ions are secreted. Small collecting ducts in the salivary glands leads to a larger channel, eventually forming a large single channel that empties into the oral cavity.
There are three pairs of major salivary glands differ in the type of secretion produced:
Salivary glands in mammals are exocrine glands, the glands that has its own channel, which produces saliva. These glands also secrete amylase, an enzyme that breaks down carbohydrates into maltose. In other organisms such as insects, this gland is often used to produce biologically important proteins like silk or glues. Salivary gland chromosomes of flies containing polyphenols useful in genetic research. These glands in humans are under the tongue. Saliva production may be interrupted in the event of dehydration, heat, or due to an illness.
Parotid gland is a salivary gland-greatest. He is surrounded by the mandibular ramus, and secrete saliva through Stensen duct to the oral cavity to help chew and produce saliva menelan.25%.
Submandibular gland is a gland located in the lower jaw, above the muscle digatrik. Production and secretion is a mixture of mucous and serous into the mouth through ducts Wharton. Although smaller than the parotid gland, approximately 70% of saliva in the oral cavity is produced by these glands.
Sublingua glands are a pair of glands located under the tongue near the submandibular gland. Approximately 5% of saliva entering the oral cavity to the exit from the gland.
There are more than 600 minor salivary glands located in the oral kacum in the lamina propria of oral mucosa. 1-2mm in diameter. These glands are usually a number of acini connected in a tiny lobule. Minor salivary gland excretion may have channels along with other minor glands, or may also have its own channel. Naturally, primarily secretion of mucous (except for Von Ebner glands) and have many functions, such as wetting the oral cavity with saliva. Dental problems usually associated with minor salivary gland.
Von Ebner gland is located in the circumvallate papillae of the tongue. These glands secrete serous fluid that begin lipid hydrolysis. This gland is an essential component of the sense of taste.
It should be noted that the sympathetic and parasympathetic stimuli resulted in increased secretion of the salivary glands . The sympathetic nervous system also affects salivary gland secretions indirectly by innervating the blood vessels of the gland.
That's all about Salivary Glands Definitions, may useful.
In the channel, the composition of the altered secretion. Most of the sodium is actively reabsorbed, potassium is released, and a large amount of bicarbonate ions are secreted. Small collecting ducts in the salivary glands leads to a larger channel, eventually forming a large single channel that empties into the oral cavity.
There are three pairs of major salivary glands differ in the type of secretion produced:
- parotid gland that produces fluid, watery serous
- submaxillary gland (mandible) to produce a mixture of serous fluid and mucous
- sublingual glands secrete saliva slimy
Other definition of Salivary Glands
Salivary glands in mammals are exocrine glands, the glands that has its own channel, which produces saliva. These glands also secrete amylase, an enzyme that breaks down carbohydrates into maltose. In other organisms such as insects, this gland is often used to produce biologically important proteins like silk or glues. Salivary gland chromosomes of flies containing polyphenols useful in genetic research. These glands in humans are under the tongue. Saliva production may be interrupted in the event of dehydration, heat, or due to an illness.
Anatomy
- Parotid gland
Parotid gland is a salivary gland-greatest. He is surrounded by the mandibular ramus, and secrete saliva through Stensen duct to the oral cavity to help chew and produce saliva menelan.25%.
- Submandibular gland
Submandibular gland is a gland located in the lower jaw, above the muscle digatrik. Production and secretion is a mixture of mucous and serous into the mouth through ducts Wharton. Although smaller than the parotid gland, approximately 70% of saliva in the oral cavity is produced by these glands.
- Sublingua gland
Sublingua glands are a pair of glands located under the tongue near the submandibular gland. Approximately 5% of saliva entering the oral cavity to the exit from the gland.
- Minor salivary gland
There are more than 600 minor salivary glands located in the oral kacum in the lamina propria of oral mucosa. 1-2mm in diameter. These glands are usually a number of acini connected in a tiny lobule. Minor salivary gland excretion may have channels along with other minor glands, or may also have its own channel. Naturally, primarily secretion of mucous (except for Von Ebner glands) and have many functions, such as wetting the oral cavity with saliva. Dental problems usually associated with minor salivary gland.Von Ebner gland is located in the circumvallate papillae of the tongue. These glands secrete serous fluid that begin lipid hydrolysis. This gland is an essential component of the sense of taste.
Innervation
Innervated salivary glands , either directly or indirectly , by the autonomic nervous system sympathetic and parasympathetic . Both resulted in the increase in amylase output .- Parasympathetic innervation of the salivary glands is carried by cranial nerves. Parotid gland receives parasympathetic input from the glossopharyngeal nerve (N IX) through otikum ganglion, while the submandibular gland and sublingua receives parasympathetic input from the facial nerve (N VII) via the submandibular ganglion. These nerves release acetylcholine and substance P, which respectively activate IP3 and DAG pathways.
- Direct sympathetic innervation of the salivary glands occurs through preganglion nerve in the thoracic segment of IT-III dwelling superior cervical ganglion neurons that release norepinephrine postganglion, which is then received by a β-adrenergic receptors in duct cells and glands asiner winch. The effect is increased secretion of saliva.
It should be noted that the sympathetic and parasympathetic stimuli resulted in increased secretion of the salivary glands . The sympathetic nervous system also affects salivary gland secretions indirectly by innervating the blood vessels of the gland.
That's all about Salivary Glands Definitions, may useful.
