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Digestive > Histology of oral cavity, tooth, pharynx and oesophagus > Flashcards

Histology of oral cavity, tooth, pharynx and oesophagus Flashcards

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1
Q

Name the types of epithelium in the oral cavity and which structures they line

A
  1. Keratinized stratified squamous epithelium- gum, hard palate.
  2. Nonkeratinized stratified squamous epithelium- soft palate, cheeks, floor of mouth, pharynx.
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2
Q

Name the 3 different covered surfaces of the lips

A
  1. Internal mucous surface
  2. Red vermillion zone (Transitional zone)
  3. Outer surface
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3
Q

Which covered surface of the lips does not have any salivary or sweat glands?

A

Red vermillion zone aka Transitional zone

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4
Q

What kind of epithelium lines the internal mucous surface?

A

Thick nonkeratinized epithelium

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5
Q

What type of epithelium lines the Transitional zone?

A

Thin keratinized stratified squamous epithelium

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6
Q

What separates the anterior 2/3 from the posterior 1/3 of the tongue?

A

Sulcus Terminalis (V-shaped)

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7
Q

Which surface of the tongue contains papillae and massed lingual tonsils

A

Dorsal surface

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8
Q

What takes up 1/3 of the tongue posteriorly

A

Massed lingual tonsils

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9
Q

Skeletal muscles of the tongue are oriented in the same direction. True of False

A

False; they are oriented in all directions

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10
Q

Name the 4 types of lingual papillae and the order of which they appear on the tongue

A
  1. Filiform papillae
  2. Fungiform papillae
  3. Foliate papillae
  4. Vallate (circumvallate) papillae
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11
Q

Which structures are formed between vallate papillae

A

Von Ebner Glands- provides continuous flow of fluid over taste buds

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12
Q

Which type of lingual papillae is conical shaped, heavily keratinized and has a gray appearance to the surface?

A

Filiform papillae

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13
Q

Which is the largest papillae and state its size

A

Vallate papillae; diameters 1 to 3mm

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14
Q

Which papillae does not have any taste buds in them

A

Filiform papillae

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15
Q

How many cells are in taste buds and what is there lifespan

A

50 to 100; 7 to 10 days

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16
Q

Which nerve carries the taste of the anterior 2/3 of the tongue

A

Facial Nerve (CN 7)

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17
Q

Which nerve carries the taste of the posterior 1/3 of the tongue

A

Glossopharyngeal nerve (CN 9)

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18
Q

There are 32 permanent teeth in adults. True or False?

A

True

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19
Q

20 of the permanent teeth are preceded by primary teeth true or false?

A

True

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20
Q

How many teeth are in a quadrant ?

A

Eight teeth: 2 incisors, 1 canine, 2 premolars, 3 molars

20
Q

Another name for primary teeth

A

Deciduous or milk teeth

21
Q

What type of tissue is present in the pulp cavity

A

mesenchymal connective tissue

22
Q

Where does the blood vessels enter the tooth from?

A

Apical foramina at root tips

23
Q

What type of ligaments hold the tooth to the bone of the jaw

A

Periodontal ligaments

24
Q

What makes up 70% of dentin

A

Hydroxyapatite

25
Q

Which cells produces dentin and lines the pulp cavity

A

Odontoblast

26
Q

When does predentin mineralize to become dentin

A

Within 1 day

27
Q

Where is predentin secreted from

A

Odontoblast

28
Q

Odontoblast is derived from neural crest in mesenchyme of developing pulp cavity. True or False?

A

True

29
Q

The enamel is the hardest component of the human body. True of False?

A

True

30
Q

How much percent of calcium hydroxyapatite is present in the enamel

A

96%

31
Q

Name the cell that produces enamel

A

Ameloblasts

32
Q

What is the main structural protein of the developing enamel

A

Amelogenin

33
Q

Ameloblasts are derived from

A

Ectodermal lining of embryonic oral cavity

34
Q

When does the primary teeth begin to erupt

A

6 months after birth

35
Q

What is the ‘bell stage’

A

When the development of secondary tooth arrest until 6 years of age

36
Q

Where does tooth formation begin

A

Embryo

37
Q

What induces ameloblasts to begin secretion of an enamel rod

A

contact with dentin

38
Q

What is the Periodontium comprised of?

A

Cementum, Periodontal ligament and Alveolar bones

39
Q

Cementum is avascular; True of False

A

True

40
Q

What type of epithelium is the oral pharynx lined by?

A

Stratified squamous nonkeratinized epithelium

41
Q

What are tonsillar crypts?

A

Deep grooves that invaginate each tonsil

42
Q

Which type of tonsil lacks crypts and is a part of MALT?

A

Pharyngeal tonsil

43
Q

How long is the oesophagus of adults?

A

25cm

44
Q

What type of epithelial cells lines the mucosa of the oesophagus

A

Nonkeratinized stratified squamous epithelium

45
Q

Name the four layers of the oesophagus and the connective tissue associated with each

A

Mucosa- Thin layer pf connective tissue
Submucosa- Dense irregular connective tissue
Muscularis externa- none
Adventitia- Loose connective tissue

46
Q

Difference between the upper and lower muscularis externa of the oesophagus

A

Upper oesophagus- muscularis externa: inner circular muscle layer and outer longitudinal muscle layers composed of skeletal muscle fibers.

Lower oesophagus- composed of smooth muscle fibers instead

47
Q
A

Digestive (16 decks)

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