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OB > Periodontium L4 > Flashcards

Periodontium L4 Flashcards

1
Q

Name the 4 extrinsic muscles of the tongue

A
  • genioglossus
  • hyoglossus
  • styloglossus
  • palatoglossus
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2
Q

Name the 4 intrinsic muscles of the tongue

A
  • superior longitudinal
  • inferior longitudinal
  • transverse
  • vertical
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3
Q

Function of the extrinsic muscles of the tongue

A

Move tongue bodily (protrude/retract/depress/elevate the tongue)

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4
Q

Functions of intrinsic muscles of the tongue (x3)

A
  • lengthens/shortens the tongue
  • curling and uncurling of its apex and edges
  • flattening/rounding of its surface
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5
Q

Name the 4 types of lingual papillae

A
  • filiform papillae
  • fungiform papillae
  • foliate papillae
  • circumvallate papillae
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6
Q

Location of filiform papillae

A

Anterior part of the tongue

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7
Q

Structure of filiform papillae

A

Cone-shaped
Connective tissue core
Keratinised epithelial cover (tough abrasive surface) ; non-keratinised epithelium in between - offers flexibility

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8
Q

Which lingual papillae does not contain taste buds?

A

Filiform papillae

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9
Q

Location of fungiform papillae

A

Anterior part of the tongue

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10
Q

Innervation of fungiform papillae

A

CN VII

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11
Q

Approx number of fungiform papillae taste buds per tongue

A

1120

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12
Q

Location of foliate papillae

A

Lateral margin of posterior aspect of tongue

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13
Q

Innervation of foliate papillae

A

Anterior: CN VII
Posterior: CN IX

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14
Q

Approx number of foliate taste buds per tongue

A

1280

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15
Q

Position of circumvallate lingual papillae

A

Anterior to the sulcus terminalis in the tongue

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16
Q

Innervation of the circumvallate papillae

A

CN IX

17
Q

Approx number of circumvallate papillae

A

2000 circumvallate taste buds per tongue

18
Q

What cell types are present in taste buds?

A
  • type I: dark cells
  • type II: light cells
  • type III: receptors
  • type IV: precursors of types I-III
19
Q

Function of type I cells in taste buds

A

Type I - dark cells

  • support cells
  • produces taste pore substance
20
Q

Function of type III cells in taste buds

A

Type III cells are receptors synaptically coupled to gustatory nerves

21
Q

Nerve supply of taste buds on:

  • posterior 1/3rd of tongue
  • anterior 2/3rd of tongue
  • epiglottis
A

posterior 1/3rd: CN IX
Anterior 2/3rd: CN VII
Epiglottis : CN X

22
Q

Where are non-lingual taste buds located?

A

Soft palate

Epiglottis

23
Q

What types of nerves are found on taste buds?

A

A-delta afferents, non-myelinated

24
Q

Receptor mechanisms (x5)

A
  • depolarising receptor cell potential
  • open voltage gated calcium channels
  • increased intracellular free calcium ions
  • release of neurotransmitter
  • depolarisation of different nerve endings
25
Q

Functions of the tongue

A
  • ingestion: mastication, swallowing, suckling, cleansing of mouth
  • sensory: taste/gustation, touch/mechanoreception
  • speech

OB (7 decks)

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