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PATHWAY OF SALIVA
SECRETION FROM
SALIVATORY NUCLEUS TO
PAROTID GLAND
FELICIA QUARSHIE
NII DARKO
WELLINGTON
OUTLINE
 INTRODUTION
 INFERIOR SALIVATORY NUCLEUS
 PATHWAY
INTRODUCTION
 All the salivary glands are
innervated by parasympathetic
nerve fibres
 Parasympathetic innervation of
the...
SALIVATION STIMULUS
 Saliva secretion is enhanced by 2
different types of salivary reflexes:
 Simple or unconditioned re...
CONDITIONED STIMULUS
 It occurs when chemoreceptors and
pressure receptors within the oral cavity
respond to the presence...
UNCONDITIONED STIMULUS
 In this case salivation occurs without oral
stimulation
 Just thinking about, smelling, or heari...
INFERIOR SALIVATORY
NUCLEUS
 Found in the brain as cluster of
neurons controlling
parasympathetic input to the
parotid gl...
INFERIOR SALIVATORY
NUCLEUS
 Located in the medulla
 Within the general visceral efferent cell
column
 Immediately medi...
INFERIOR SALIVATORY
NUCLEUS
PATHWAY
 In the medulla, fibres of the isn join with fibres
of the gustatory nucleus, nucleus ambiguus
and spinal nucleus...
PATHWAY
Here, it is lateral to the greater petrosal branch of
the facial nerve. The preganglionic fibers from the
lesser p...
PATHWAY
 It arises by two roots which embrace the middle meningeal
artery just below the foramen spinosum and deep to the...
PATHWAY
INFERIOR SALIVATORY NUCLEUS.
TYMPANIC BRANCH OF CN IX .
TYMPANIC PLEXUS
LESSER PETROSAL NERVE
OTIC GANGLION
AURICU...
PATHWAY
PATHWAY
THANK YOU
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Saliva secretion pathway

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Saliva secretion pathway

  1. 1. PATHWAY OF SALIVA SECRETION FROM SALIVATORY NUCLEUS TO PAROTID GLAND FELICIA QUARSHIE NII DARKO WELLINGTON
  2. 2. OUTLINE  INTRODUTION  INFERIOR SALIVATORY NUCLEUS  PATHWAY
  3. 3. INTRODUCTION  All the salivary glands are innervated by parasympathetic nerve fibres  Parasympathetic innervation of the parotid gland is from the inferior salivatory nucleus through the auriculotemporal nerve
  4. 4. SALIVATION STIMULUS  Saliva secretion is enhanced by 2 different types of salivary reflexes:  Simple or unconditioned reflexes  Aquired or conditioned reflexes
  5. 5. CONDITIONED STIMULUS  It occurs when chemoreceptors and pressure receptors within the oral cavity respond to the presence of food  On activation these receptors initiate impulses in afferent nerve fibers that carry the information to the salivary center located in the medulla of the brain  The salivary center in turn sends impulses via extrinsic autonomic nerves to the salivary glands to promote salivation
  6. 6. UNCONDITIONED STIMULUS  In this case salivation occurs without oral stimulation  Just thinking about, smelling, or hearing the preparation of pleasant food initiate salivation through this reflex  Also called mouth watering  This reflex is a learned response based on previous experience
  7. 7. INFERIOR SALIVATORY NUCLEUS  Found in the brain as cluster of neurons controlling parasympathetic input to the parotid gland  One of the components of glossopharyngeal nerve (cn ix)
  8. 8. INFERIOR SALIVATORY NUCLEUS  Located in the medulla  Within the general visceral efferent cell column  Immediately medial to the nucleus ambiguus  Inferior to the superior salivatory nucleus
  9. 9. INFERIOR SALIVATORY NUCLEUS
  10. 10. PATHWAY  In the medulla, fibres of the isn join with fibres of the gustatory nucleus, nucleus ambiguus and spinal nucleus of cn v  Exit the medulla as the mixed cn ix between the medulllary olive and the inferior cerebellar peduncle  The fibres then pass through the tympanic nerve into the tympanic plexus in the middle ear  Exit the plexus within the lesser petrosal nerve which passes through the petrous part of the temporal bone and comes to lie in the floor of the middle cranial fossa
  11. 11. PATHWAY Here, it is lateral to the greater petrosal branch of the facial nerve. The preganglionic fibers from the lesser petrosal nerve usually enter the infratemporal fossa through the foramen ovale to synapse with cells in the otic ganglion, which send postganglionic fibers into the auriculotemporal nerve, a branch of the mandibular division of the trigeminal nerve
  12. 12. PATHWAY  It arises by two roots which embrace the middle meningeal artery just below the foramen spinosum and deep to the lateral pterygoid muscle  It crosses lateral to the sphenomandibular ligament immediately below the spine of the sphenoid and lies close to the inner side of the capsule of the mandibular joint  It then winds around the neck of the back of the condyle below the attachment of the joint capsule and passes upwards to enter the small glenoid lobe of the parotid gland  At the parotid gland, it gives off secretomotor fibres to stimulate saliva secretion
  13. 13. PATHWAY INFERIOR SALIVATORY NUCLEUS. TYMPANIC BRANCH OF CN IX . TYMPANIC PLEXUS LESSER PETROSAL NERVE OTIC GANGLION AURICULOTEMPORAL NERVE PAROTID GLAND
  14. 14. PATHWAY
  15. 15. PATHWAY
  16. 16. THANK YOU

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