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Oral Histology > Lab: Histology of pharyngeal arches (Exam 1) > Flashcards

Lab: Histology of pharyngeal arches (Exam 1) Flashcards

1
Q

Dorsal Surface of tongue:

A

Faces roof of oral cavity

  • Oral region (ant 2/3)
  • Pharyngeal region (post 1/3)
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2
Q

Ventral surface of tongue:

A

Faces floor of oral cavity

- Oral region (ant 2/3)

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3
Q

Oral region (moveable)

A

Anterior 2/3 of tongue

  • Dorsal surface: SSK with lingual papilla (ectodermal origin)
  • Ventral surface: SSNK (endodermal origin)
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4
Q

Pharyngeal region (fixed):

A

Posterior one-third of tongue

- Dorsal surface: SSNK epithelium (endodermal origin)

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5
Q

What type of mucosa covers the dorsum of the tongue?

A

Specialized mucosa

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6
Q

What type of mucosa covers the ventral surface?

A

Lining mucosa

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7
Q

What is lining Mucosa

A

Refers to epithelium and underlying Ct in portions of the oral cavity that are not subject to abrasive force—- lining mucosa is usually associated with SSNK epithelium

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8
Q

What is specialized Mucosa:

A

stratified squamous keratinized epithelium and underlying CT interspersed with lingual papillae. Confined to dorsal surface of anterior 2/3 of tongue

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9
Q

What are lingual papillae:

A

Surface elevations of epithelium which may contain taste buds. The presence of papillae is what makes the mucosa specialized

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10
Q

What are taste buds:

A

Comprised of several cells (supporting cells, basal cells; and sensory neuroepithelial cells) with a small opening (taste pore) at apex. Taste buds can be found in association with lingual papillae or (free) scattered in the epithelium of soft palate, posterior 1/3 of tongue, epiglottis and larynx

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11
Q

What are the key features of the Anterior 2/3 of tongue:

A 
Dorsal and ventral surfaces
Specialized mucosa and lining mucosa
lingual papillae
Taste buds
Mixed minor salivary glands near midline of tip of tongue (mixed glands contain both serous and mucous cells)
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12
Q

Filiform Papillae:

A
  • No taste buds
  • Located: Scattered amount fungiform papillae on dorsum of tongue
  • Comments: conical in shape, extensive keratinization
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13
Q

Fungiform papillae:

A
  • Contain taste buds
  • Located: Scattered over dorsal surface of anterior 2/3 tongue
  • comments: Rounded shape, variable height; highly vascularized
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14
Q

Circumvallate (Vallate):

A
  • Contain taste buds
  • Located: along anterior to the terminal sulcus
  • Comments: Large domed shaped papillae; taste buds along lateral sides, deep invaginations of epithelium surrounding papillae (called troughs/crypts); serous salivary glands (Glands of Von Ebner) are present in CT
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15
Q

Foliate Papillae:

A
  • Contain taste buds
  • Located: along posterior lateral margin of tongue
  • Comments: Conical shape, each papillae same height, taste buds located on lateral margin; crypts surround papillae; serous salivary glands present in CT
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16
Q

Where are papillae found:

A

Papillae are found in specific locations on anterior 2/3 tongue and can be used to determine the location of the tissue section.

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17
Q

What causes the appearance of red tastebuds

A

Vascularized CT core causes the red appearance Taste buds along surface hard to see in preps

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18
Q

What is the circumvallate innervated by?

A

It’s innervated by the nerve of the 3rd PA (glossopharyngeal Nerve)

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19
Q

What are the Crypt of papilla:

A

Facing taste buds- contains saliva

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20
Q

Serous glands:

A

Produce a watery protein rich saliva Brightly stained in section with rounded nuclei

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21
Q

Ducts of Salivary gland:

A

Open into the crypt and bathe the taste buds with saliva

22
Q

Serous glands (Of Von Ebner)

A

Found in CT at base of papilla

23
Q

Tate bud of a lingual papilla contains four cell types:

A 
Type I supportive 
Type II (Taste receptor cell)
Type III (taste receptor cell)
Type IV (Basal stem cell)

Different receptor cells detect different taste modalities (sensations) based on receptor expression

24
Q

Taste (SVA) to fungiform and foliate papilla is:

A

Facial N. (VII)

25
Q

Taste (SVA) to circumvallate papilla is via:

A

Glossopharyngeal (IX)

26
Q

Vagus (x) is:

A

General sensory GSA and taste (SVA) to taste buds located near the epiglottis

27
Q

additional taste buds which are not associated with papillae can be scattered on

A

posterior 1/3 /epiglottis/ soft palate

28
Q

Glossopharyngeal (IX)

A

General sensory (GSA) and taste (SVA)

29
Q

Lingual of Trigeminal (V3)

A

General sensory (GSA) (Pain/temp)

30
Q

Chorda Tympani of Facial (VII)

A

Taste (SVA) anterior 2/3

31
Q

All motor to tongue:

A

Hypoglossal (XII) except palatoglossus (X)

32
Q

Minor salivary glands release saliva constitutively by:

A

Merocrine method

33
Q

Serous glands

A

May secrete a watery (serous) secretion; and stain very eosinophilic. Round basal nuclei

Anterior to sulcus terminalis region of circumvallate papillae, foliate papilla

34
Q

Mucous Glands

A

May secrete a viscous (mucous) secretion and appear pales stoning due to mucin. Flattened basal Nuclei

Soft palate, posterior 1/3 of tongue

35
Q

Mixed (Seromucous)

A

Produce a msxed secretion. Often the mixed gland may be more serous or produce a predominately mucous type of secretion. Serous cell sits on top of mucous cells

Anterior 2/3 tip open onto ventral side; also on the labial surface (Lip) and buccal surface, pharynx

36
Q

Pharyngeal region (fixed)

A

Defined as the proton of tongue that extends from palatoglossal folds to epiglottis

SSNK epithelium covers the surface (Endodermal origin)

Lining mucosa covers post 1/3

37
Q

Structures associated and key features of Pharyngeal region:

A
  • lingual Tonsils: Bilateral groups of large lymphatic nodules found beneath the epithelium in the lamina propria. As a reminder all tonsils are considered to be MALT tissue
  • Minor (pure) mucous salivary glands are found in posterior 1/3
  • Skeletal Muscle
38
Q

In the midline of the nasopharynx is what tonsil?

A

Pharyngeal or adenoid tonsil

39
Q

Posterior to the palatoglossal folds are the:

A

Bilateral palatine tonsils

40
Q

Tonsils are:

A

aggregates of MALT tissue found at the entrance of the pharynx which provide immunological defense for the oral cavity and pharynx

41
Q

What is Waldeyer’s ring?

A

Collective the three tonsillar groups: Lingual, palatine, pharyngeal form a region of lymphatic tissue known as Waldeyer’s ring

42
Q

All types of MALT are characterized by:

A

Epithelium covering the lymphatic nodules and diffuse lymphatic tissue: A CT is not present

43
Q

These tonsil are associated with the boundary between the oral cavity and oropharynx. SSNK covers both tonsils.

A

Palatine and lingual tonsils

44
Q

This tonsil sits at the boundary of the oropharynx and nasopharynx. IT is covered with SSNK and PSCC, which correspond to the types of epithelium found in each areas respectively. The key feature which is unique to the tonsil is PSCC

A

Pharyngeal Tonsil

45
Q

In the epiglottis the oral side will have what type of epithelium?

A

SSNK

46
Q

In the epiglottis the side facing the larynx and respiratory system will have what type of epithelium?

A

Respiratory epithelium (PSCC)

47
Q

The epiglottis is flexible due to:

A

Elastic cartilage and folds down to close off the airway during eating. This causes the food to enter esophagus and protects the airway

48
Q

Area including the true vocal fold and below (subglottic region)

A

Is from PA 6. The mucosa receive sensory information and motor innervation to all of muscle below the mucosa from a branch of the vagus that is associated with PA 6.

49
Q

Area above the ventricle (space between folds- Transglottic region) to the epiglottis:

A

The mucosa is endoderm from the PA 4 and receives primarily sensory information from a branch of the vagus that develops in association with PA 4.

50
Q

The epithelium of larynx transitions from:

A

PSCC to SSNK around vocal cords and back to PSCC in trachea

51
Q

What happens in laryngeal edema (laryngitis)?

A

Fluid accumulates in the submucosus space and the mucosa swells up and obstructs the airway

Oral Histology (12 decks)

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