Salivary Glands Overview - Anatomy & Physiology
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Salivary glands are present in the cheek, tongue, lips, oesophagus, soft palate and pharynx but the major salivary glands are located further away from the oral cavity and function through connective ducts.
Saliva provides digestive enzymes, is a route of excretion of substances which accumulate on the teeth and provides lubricative and also cleansing functions. Salivary glands can produce a serous secretion, a mucous secretion or both.
Types of Salivary Glands
Major Salivary Glands
Minor Salivary Glands
The salivary glands are innervated by sympathetic- Vasoconstriction occurs and the flow of saliva is decreased.
The salivary glands are also innervated by parasympathetic (most important)- They travel from the brainstem by the facial (CN VII) and glossopharyngeal (CN IX) then into branches of the trigeminal nerve (CN V). The flow of salivary fluid increases and vasodilation occurs.
Saliva is mainly water and contains amylase for carbohydrate digestion, salt- mainly sodium bicarbonate, mucin, electrolytes, antimicrobial agents and lingual lipase.
Produce up to 40L per day.
Produce 110-180L per day.
Produce up to 15L per day.
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