39397 netter147

Salivary Gland Sccretion

Aud/tor

^buchKtimuR'

T.iŃte I from tę

—► «₂o    _n

- Amylase Organie 'j ^ constitucnts

teflular l $; elements. f \ protein, urea. * j uńc add J * Inorganic 1 l; constitucnts l \ Ca, K. Na, CO... I S PO4.0, SCN J

Interiobular (striated) duet

Secretory

/asoconstrictor

Parasympathctw

Secretor\

GASTROINTESTINAL PHYSIOŁOGY

Pnncipal sensory and spinał nucleus of V

✓    Salwatory nudei

✓Salwatory

center

✓    Nudeus of solitary tract

- Dorsal nucleus of vagus

Intercalalcd

'Submandibular ganglion__

Sublingual \ gland J

^? _ /Superior ’ ^J cervicai . 8anglion

!ntrtlobula(^j|M

duet

Mucous cells • Baskct celi *

Submandibular

Demilunc oi serous cells

Thoracic — sympalhetic ganglionic chain

łonie t oncentrations ot saliva shown as a function of salivary flow ratę

JOMNACRAIC„*d

l»\

Figurę 7.25 Sauyary Gland Secretion

The salivary gland is under autonomie control. The glands receive both sympathetic and parasympathetie input. Of these, the parasym-pathetic system is morę important in stimulating secretion. The aci-nar cells secrete the protein (serous cells) and muc us (mucous cells) components of saliva. The acini also secrete a fluid component that has a composition similar to that of plasma. As the saliva makes its way out of the gland, the ductal cells modify its electroiyte e.omposi-tion by active transport, such that the sałiva entering the mouth is hypotonic to plasma and has a high bicarbonate concentration.

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