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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
what are the huge papillae
circumvallate
26
what papillae would you find a bunch of at apex of tongue
fungiform
27
which papillae has NO TASTE BUDS
filiform
28
what type of epi are filiform
Conical, elongated projections with highly developed SSK epithelium
29
what papillae serve a mechanical role
filiform -> GSA lingual branch of V3 touch, vibration and pressure
30
which papillae on a slide have their tips point posteriorly
filiform kinda looks like hair blowing in wind on a guy
31
what papillae are mushroom shaped
fungiform
32
what papillae are Scattered amongst and project above filiform papillae
fungiform
33
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)
TRUE
34
what innervates taste buds
branch of facial -> chorda tympani (SVA) and a small contribution from lingual branch of glossopharyngeal
35
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
foliate
36
T/F: circumvallate are Composed of thick SSNK with numerous taste buds along the lateral surface
FALSE FOLIATE ARE!!
37
what types of glands are in the CT in foliate
serous glands --> need to start breaking down food!
38
what papillae are covered with SSK and very thin keratin layer
circumvallate
39
how can you tell the difference bw circumvallate and fungiform
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
what papillae are surrounded by deep moat-like circular trenches (clefts)
circumvallate papillae
41
what papillae contain taste buds
-Present on fungiform, foliate and circumvallate papillae -Oval, pale-staining bodies that extend through the thickness of the epithelium
42
what are the 3 principle cell types on taste buds
1. Neuroepithelial (sensory cell) 2. Supporting cell 3. Basal cell (stem cell)
43
where are chemoreceptors located in taste buds
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
where can you find free taste buds
Free taste buds scattered throughout soft palate, posterior 1/3 of tongue, palate, epiglottis and even the larynx
45
what does the sulcus terminalis mark
Marks point of fusion between 1st arch and 3rd arches
46
what does the foramen cecum mark
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
what does PA 1 form
ectodermal mucosa of ant 2/3
48
what does PA 3 form
endodermal mucosa of psot 1/3
49
what does PA 4 form
forms endodermal mucosa for root of tongue (minor contribution) and epiglottis
50
-Lateral lingual swellings (distal tongue buds) --bilateral structures -Median tongue bud (Tuberculum impar ) -central structure between lateral lingual swellings WHAT ARCH
PA 1
51
Hypopharyngeal (Hypobranchial) eminence (rostral) ---midline structure extending from arches 3rd and 4th WHAT ARCH
PA 3
52
Hypopharyngeal (Hypobranchial) eminence (distal) AND Epiglottic swelling (4th) WHAT ARCH
PA 4
53
T/F region of 2nd pharyngeal arch= copula and DOES contribute to tongue region. The 2nd arch is overgrown by hypopharyngeal (hypobranchial) eminence 3rd
FALSE region of 2nd pharyngeal arch= copula and DOESNT contribute to tongue region. The 2nd arch is overgrown by hypopharyngeal (hypobranchial) eminence 3rd
54
what n is associated with PA 4
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
what n is associated with PA 3
Glossopharyngeal (CN IX) –GSA and SVA *Posterior 1/3 Mucosa and taste buds of posterior1/3 tongue & taste buds circumvallate papillae
56
what n is associated with PA 2
Copula overgrown and becomes embedded in anterior 2/3 of tongue * Anterior 2/3-taste * Chorda tympani (CN VII)- SVA
57
T/F Hypoglossal (CN XII) –all skeletal muscles EXCEPT palatoglossus muscle (PA 4) (extrinsic) Tongue contains intrinsic (change shape) and extrinsic (position) muscles
TRUE
58
what is Pseudomembranous candidiasis (thrush)
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
what provides motor to palatoglossus ms
pharyngeal plexus - CN X **ALL other skeletal ms of tongue are3 hypoglossal XII
60
what are PA 2 developmental precursors and adult structures
copula (no adult structure)
61
what are PA 1 developmental precursors and adult structures
tuberculum impar and lateral lingual swellings adult: none and mucosa of ant 2/3
62
what are PA 4 developmental precursors and adult structures
hypobranchial eminence/epiglottic swelling adult: mucosa of root of tongue/epiglottis

Ethmoid Bulla aka Oral Histology Exam 2 (7 decks)

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