Salivary gland pathology Flashcards
Where is the nucleus for the parotid gland?
Inferior salivatory nucleus in medulla
Preganglionic nerve for parotid gland
Preganglionic neurones of glossopharyngeal CNIX start here. Tympanic branch of CNIX forms tympanic plexus in middle ear cavity, from which arises the lesser superficial petrosal nerve, which goes to the otic ganglion.
Postganglionic neurone of parotid gland
Fibres from otic ganglion rejoin the auriculotemporal nerve (CNV3)
Where is the nucleus of the submandibular and sublingual gland?
Superior salivatory nucleus
Preganglionic and postganglionic fibres of SLG and SMG
Preganglionic fibres join the nervus intermedius. Through the facial, fibres join the chorda tympani which join the lingual nerve. Reaches the submandibular ganglion. Postganglionic fibres go straight to SMG. Fibres go through lingual nerve to the SLG.
how does saliva production vary during the day?
peak saliva production in the afternoon. minimal salivary production at night.
what are the 2 modes of salivary production are recognised?
baseline/stimulated and stimulated
what is serous saliva?
thin, water saliva
what is mucous saliva?
thick saliva
what saliva does the parotid gland produce?
serous saliva
where are the minor salivary glands distributed?
lips, cheeks, palate, floor of mouth, retro-molar area, upper aerodigestive tract
what controls the minor saliva glands?
under control of the ANS
what are secretory acini composed of?
serous secretory cells or mucous secretory cells
what do myoepithelial cells embrace the secretory units?
their contractions help to expel the secretions
what do the units drain into?
terminal secretory units merge to form small intercalated ducts which are lined by secretory cells. intercalated ducts drain into large ducts called striated ducts. striated ducts drain into excretory ducts.
what is the primary stage of saliva secretion?
occurs in acini. main stage of production secreted as fluid isotonic with plasma (true for serous acini)
what is the secondary stage of saliva?
modification stage. occurs in striated ducts. ions are reabsorbed to produce hypotonic saliva containing less sodium and chloride, and more and carbonate than plasma.
where does the sublingual salivary gland lie?
lies just deep to the floor of the mucosa of the mouth between the mandible and the genioglossus. bounded inferiorly by the mylohyoid muscle.
what is the sublingual gland drained by?
it is drained by many small ducts
how much of the secretions does the submandibular gland secretion?
secretes around 65% of unstimulated release
50% of stimulated secretions
where does the submandibular gland lie?
submandibular triangle. gland forms the shape of a C around the anterior margin of the mylohyoid muscle
what does the mylohyoid divide the submandibular gland into?
superficial lobe of submandibular
deep lobe of submandibular
boundaries of the parotid gland?
superiorly - zygomatic bone
posteriorly - external auditory canal
inferiorly - styloid process, ICA, jugular veins
anterior border - anterior border of masseter muscle
what space does the parotid gland lie?
80% overlies masseter and mandible
20% is the retromandibular portion - lies in the prestyloid compartment of the parapharyngeal space
