SALIVARY GLAND
• Present in the mouth outside buccal cavity.
• Exocrine glands.
• Three pairs in number.
Parotid salivary gland -
• It is the largest salivary gland.
• Present between ear lobe and zygomatic bone.
• Types of compound tubuloalveolar gland.
• Stenson's Duct is associated with it and it opens near upper second molar.
• Contribute 25% saliva and maximum salivary amylase.
Note :- Infection of parotid gland by paramyxovirus is called mumps.
Submaxillary gland / Submandibular gland -
• Present in the mandibular notch.
• Types of compound alveolar gland.
• Wharton's Duct is associated with it and it open behind lower incisors.
• Contribute 70% saliva and maximum water to saliva.
Sublingual salivary gland -
• Smallest salivary gland.
• Present below the mucosa of the buccal cavity lining below tongue.
• Types of compound alveolar gland.
• Duct of rivinus is associated with it and they open on either side of frenulum linguae.
• Contribute 5% saliva and maximum mucus to it.
SALIVA
Volume = 1-1.5 Liter/Day
pH of saliva = 6.8
Composition of saliva :
(i) 99.5% water
(ii) Enzymes
(a) Amylase / Ptyalin / Diastase( breakdown of polysaccharide into disaccharide)
(b) Lysozyme ( antimicrobial enzyme)
(iii) IgA
(iv) Salts / Ions ( Na+,K+,Cl- etc.) = Chlorine ion activate salivary amylase
(v) mucus (lubricant)
(vi) nitrogenous waste (urea / uric acid)
Regulation of saliva secretion :
- Parasympathetic nervous system increase saliva secretion.
- Sympathetic nervous system decrease saliva secretion.
Thanks for notes Sir...
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