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Ethmoid Bulla aka Oral Histology Exam 2 > 4 Regional Histology of Oral Mucosa > Flashcards

4 Regional Histology of Oral Mucosa Flashcards

1
Q

what separates the oral (anterior 2/3) and oropharyngeal (posterior 1/3) cavities

A

the sulcus terminalis (V-shaped goove) and palatoglossal fold/arch

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2
Q

what is the function of the tongue

A

Articulation of speech, manipulating food into the oropharynx during deglutition, involved with mastication and taste

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3
Q

what are the 3 parts of the tongue

A
  1. Root (posterior 1/3)
  2. Body (anterior 2/3, mobile)
  3. Apex (anterior 2/3, mobile)
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4
Q

what part of the tongue is mobile

A

the anterior 2/3

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5
Q

T/F

the dorsal surface of the anterior 2/3 of the tongue comes from ECTOderm

A

TRUE

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6
Q

T/F

the ventral surface of the anterior 2/3 of the tongue comes from ECTOderm

A

FALSE

ENDODERM!! (as is the dorsal surface of the oropharyngeal region posterior 1/3 of the tongue too)

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7
Q

which surface of tongue faces palate

A

dorsal

ventral faces floor of mouth

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8
Q

is specialized mucosa on the dorsal or ventral surface of the ant 2/3 of tongue

A

dorsal. SSK with lingual papilla

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9
Q

what type of mucosa does the ventral surface of the ant 2/3 of tongue have

A

LINING mucosa - very think SSNK and NO taste buds.

can see deep lingual vein

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10
Q

what type of glands are by the apex of tongue

A

MIXED minor salivary glands

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11
Q

what is a frenulum

A

mucosal fold connecting tongue to floor of mouth

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12
Q

what type of epi is the dorsal surface of the posterior 1/3 of tongue

A

SSNK - cobblestone appearance

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13
Q

what GL is the dorsal surface of the post 1/3 of tongue

A

ENDO

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14
Q

what two regions of the tongue have lining mucosa, endoderm GL, and SSNK

A

ventral surface of ANT 2/3 and dorsal surface of POST 1/3

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15
Q

what region of the tongue has SSK, ECTO GL, and Specialized mucosa with lingual papilla

A

dorsal surface of ANT 2/3

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16
Q

where can you find lingual papillae

A

dorsum of ant 2/3 tongue

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17
Q

what are lingual papillae

A
  • Mucosal irregularities and elevations
  • Specialized mucosa
  • Associated with taste buds
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18
Q

what is the origin of the thyroid gland

A

foramen cecum – anything ant to it is considered the ant 2/3 of tongue

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19
Q

4 types of papillae

A

filiform
fungiform
circumvallate
foliate

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20
Q

what papillae are arranged in V-shaped rows parallel to sulcus terminalis

A

Filiform

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21
Q

what papillae are observe as pink or red spots, scattered among filiform papillae; more numerous at apex of tongue

A

fungiform

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22
Q

what papillae are v shaped arranged and directly anterior to sulcus terminalis

A

circumvallate

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23
Q

what papillae are Transverse parallel ridges anterior lateral to circumvallate papillae (organized at right angle to long axis of tongue)

A

foliate

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24
Q

what papillae are on the side of the tongue

A

foliate

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25
Q

what are the huge papillae

A

circumvallate

26
Q

what papillae would you find a bunch of at apex of tongue

A

fungiform

27
Q

which papillae has NO TASTE BUDS

A

filiform

28
Q

what type of epi are filiform

A

Conical, elongated projections with highly developed SSK epithelium

29
Q

what papillae serve a mechanical role

A

filiform -> GSA lingual branch of V3

touch, vibration and pressure

30
Q

which papillae on a slide have their tips point posteriorly

A

filiform

kinda looks like hair blowing in wind on a guy

31
Q

what papillae are mushroom shaped

A

fungiform

32
Q

what papillae are Scattered amongst and project above filiform papillae

A

fungiform

33
Q

T/F

fungiform are Highly vascular CT core that projects to the base of the very thin SSK gives red appearance (similar feature to vermillion zone)

A

TRUE

34
Q

what innervates taste buds

A

branch of facial -> chorda tympani (SVA) and a small contribution from lingual branch of glossopharyngeal

35
Q

what papillae Consist of parallel low ridges (same height) separated by deep mucosal clefts and are aligned in right angles to the long axis of the tongue

A

foliate

36
Q

T/F: circumvallate are Composed of thick SSNK with numerous taste buds along the lateral surface

A

FALSE

FOLIATE ARE!!

37
Q

what types of glands are in the CT in foliate

A

serous glands –> need to start breaking down food!

38
Q

what papillae are covered with SSK and very thin keratin layer

A

circumvallate

39
Q

how can you tell the difference bw circumvallate and fungiform

A

Location of taste buds distinguishes vallate from fungiform papillae

vallate -> Taste buds line the lateral walls within the invaginated trenches

fungiform -> located at the apical interface of the epithelium and CT

40
Q

what papillae are surrounded by deep moat-like circular trenches (clefts)

A

circumvallate papillae

41
Q

what papillae contain taste buds

A

-Present on fungiform, foliate and circumvallate papillae
-Oval, pale-staining bodies that extend through the thickness of the epithelium

42
Q

what are the 3 principle cell types on taste buds

A
  1. Neuroepithelial (sensory cell)
  2. Supporting cell
  3. Basal cell (stem cell)
43
Q

where are chemoreceptors located in taste buds

A

Chemoreceptors located along microvilli within taste pore
* different receptors/ion channels required to interpret sweet, salty, bitter, sour and umami
* Every taste bud is capable of detecting each taste modality

44
Q

where can you find free taste buds

A

Free taste buds scattered throughout soft palate, posterior 1/3 of tongue, palate, epiglottis and even the larynx

45
Q

what does the sulcus terminalis mark

A

Marks point of fusion between 1st arch and 3rd arches

46
Q

what does the foramen cecum mark

A

represents site of origin for thyroid gland –visible in adult
* Thyroid gland: develops from the endoderm in floor of pharynx (between PA 1 and PA 3) demarcated by the
foramen cecum and migrates to final location

47
Q

what does PA 1 form

A

ectodermal mucosa of ant 2/3

48
Q

what does PA 3 form

A

endodermal mucosa of psot 1/3

49
Q

what does PA 4 form

A

forms endodermal mucosa for root of tongue (minor contribution) and epiglottis

50
Q

-Lateral lingual swellings (distal tongue buds) –bilateral structures
-Median tongue bud (Tuberculum impar ) -central structure between lateral lingual swellings

WHAT ARCH

A

PA 1

51
Q

Hypopharyngeal (Hypobranchial) eminence (rostral) —midline structure extending from arches 3rd and 4th

WHAT ARCH

A

PA 3

52
Q

Hypopharyngeal (Hypobranchial) eminence (distal) AND Epiglottic swelling (4th)

WHAT ARCH

A

PA 4

53
Q

T/F

region of 2nd pharyngeal arch= copula and DOES contribute to tongue region. The 2nd arch is overgrown by hypopharyngeal (hypobranchial) eminence 3rd

A

FALSE

region of 2nd pharyngeal arch= copula and DOESNT contribute to tongue region. The 2nd arch is overgrown by hypopharyngeal (hypobranchial) eminence 3rd

54
Q

what n is associated with PA 4

A

Vagus (CN X) –GSA and SVA (taste)

*Epiglottis (oral side) Mucosa and taste buds of epiglottis and small portion of posterior 1/3 mucosa

55
Q

what n is associated with PA 3

A

Glossopharyngeal (CN IX) –GSA and SVA

*Posterior 1/3 Mucosa and taste buds of posterior1/3 tongue & taste buds circumvallate papillae

56
Q

what n is associated with PA 2

A

Copula overgrown and becomes embedded in anterior 2/3 of tongue
* Anterior 2/3-taste
* Chorda tympani (CN VII)- SVA

57
Q

T/F
Hypoglossal (CN XII) –all skeletal muscles EXCEPT palatoglossus muscle (PA 4) (extrinsic)
Tongue contains intrinsic (change shape) and extrinsic (position) muscles

A

TRUE

58
Q

what is Pseudomembranous candidiasis (thrush)

A

candida albicans. can exist in 3 phases: yeast, pseudophyphae and hyphae

Hyphae are seen in the parakeratinized layer of the epithelium as a superficial infection.

Typically, the epithelium is hyperplastic and hyperparakeratinized with leukocytes

59
Q

what provides motor to palatoglossus ms

A

pharyngeal plexus - CN X

**ALL other skeletal ms of tongue are3 hypoglossal XII

60
Q

what are PA 2 developmental precursors and adult structures

A

copula (no adult structure)

61
Q

what are PA 1 developmental precursors and adult structures

A

tuberculum impar and lateral lingual swellings

adult: none and mucosa of ant 2/3

62
Q

what are PA 4 developmental precursors and adult structures

A

hypobranchial eminence/epiglottic swelling

adult: mucosa of root of tongue/epiglottis

Ethmoid Bulla aka Oral Histology Exam 2 (7 decks)

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