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Histology > Lecture 12 - Oral > Flashcards

Lecture 12 - Oral Flashcards

1
Q

Oral mucous membrane

A

mostly stratified squamous epithelium (non-keratinized but friction areas are keratinized), wet mucosa, and highly permeable on the floor

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2
Q

Areas of high friction in mouth

A

gingiva, hard palate, and dorsal suface of tongue may be keratinized.

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3
Q

Vermillion zone

A

transition between keratinized and non-keratinized. Abundant dermal capillaries (red color)

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4
Q

Type of muscle in the lip

A

striated muscle.

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5
Q

number of permanent teeth and the division and roots

A 
32.
8 incisors (cutting, 1 root)
4 canine (grasping, 1 root)
8 premolars (grinding, 2 roots)
12 molars (grinding, 2 roots)
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6
Q

number of baby teeth

A

20 deciduous teeth

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7
Q

Structure of tooth

A

crown (exposed) and root (in socket)

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8
Q

Enamel

A

99% calcium crystals. outer most part. Produced by ameloblasts

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9
Q

Dentin

A

bulk of the tooth. contains type I collagen and minerals

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10
Q

Pulp cavity

A

vessels and nerves. inner most part of tooth.

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11
Q

Apical foramen

A

communication area between pulp and what goes into the bone

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12
Q

Periodontal ligament

A

between cementum and the bone and allows for slight movement of teeth. continuous with gingiva

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13
Q

Cementum

A

bone layer of tooth root. Connects dentin to the ligament. produced by cementocytes

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14
Q

Odontoblasts

A

give rise to dentin (predentin first but matures). which surround the pulp cavity. processes that extend into canals (dentinal tubules)

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15
Q

Ameloblasts

A

produce enamel. Rods like structure

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16
Q

Branching occurs in what portion of the odontoblasts?

A

middle portion

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17
Q

Cementocytes

A

produce cementum

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18
Q

sharpey’s fibers

A

collagen bundles from periodontal ligament

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19
Q

alveolar processes

A

bone that forms sockets for dental roots

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20
Q

Gingival sulcus

A

space between the free gingival and crown. lined by non-keratinized epithelium.

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21
Q

Development of teeth

A

begins at 6-7 weeks of gestation. crown formation begins before root. Root will coincide with eruption

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22
Q

Enamel organ origin (bud phase)

A

ectoderm. cellular down-growth of oral epithelium. origin of crown.

23
Q

Dental papilla origin (cap phase)

A

mesoderm. forms dentin related structures and pulp.

24
Q

Mesenchyme origin (bell phase)

A

dental sac. forms cementoblasts and periodontal ligament.

25
Q

Hard palate

A

first 2/3 of palate which separates nasal cavity from oral cavity. salivary glands (mucus)

26
Q

Soft palate

A

separates nasopharynx and oropharynx. uvula. Taste buds.

27
Q

Tongue

A

interlacing skeletal muscle. dorsal surface has thick keratinized.

28
Q

oral protion of tongue

A

anterior 2/3 has lingual papillae.

29
Q

Pharyngeal portion of tongue

A

posterior 1/3. lingual tonsils.

30
Q

Sulcus terminalis

A

V-shaped shallow groove separating palatine and pharyngeal portions

31
Q

3 types of papillae

A

filiform, fungiform, and circumvallate

32
Q

Filiform papillae

A

most numerous, conical shaped, keratinized, no taste buds.

33
Q

Fungiform papillae

A

mushroom shaped, contain a few taste buds

34
Q

Circumvallate papillae

A

moat. located in front of the sulcus terminalis. Contains taste buds and glands of von ebner

35
Q

Glands of von ebner

A

in circumvallate. deliver serous secretions to help clean.

36
Q

Taste buds

A

gustatory cells (taste) lined by microvilli (light stainint), other cells are support cells (dark staining) and basal stem cells (connect to the nerve).

37
Q

Taste pore

A

microvilli project into the ppore and are exposed to the microenvironment.

38
Q

Lingual tonsils

A

minor salivary glands secrete mucus into crypts

39
Q

Composition of saliva

A

95% water, proteins (enzymes, mucus, IgA, lysozyme, lactoferrin) and electrolytes

40
Q

Location of major salivary glands

A

parotid, submandibular, and sublingual. All encapsulated

41
Q

Minor salivary glands

A

not encapsulated, short ducts, and located everywhere and continuous.

42
Q

Serous

A

more aqueous (zymogen ganules and amylase), stain dark. SAD

43
Q

Mucus

A

mucin (lubrication), more dense. stain light.

44
Q

Acini of glands

A

formed by myoepithelial cells. similar to muscle to help secret saliva.

45
Q

type of ducts for salivary glands

A

striated ducts which help modify with electrolytes

46
Q

Parasympathetic stimulation of saliva

A

more saliva

47
Q

Sympathetic stimulation of saliva

A

reduces saliva.

48
Q

2 nuclei in the brain stem that affect saliva

A

superior - sublingual and submandibular

inferior - parotid

49
Q

Parotid glands

A

25% of saliva. serous type (compound alveolar) - water, electrolytes, and amylase, IgA. Stenson’s duct - inner cheek.

50
Q

Submandibular glands

A

70% of saliva. mixed type (serous predominates) with serous demilunes (compound tubuloalveolar) - mucin. Wharton’s duct on the floor of the mouth.

51
Q

Sublingual glands

A

5% saliva. smallest. mixed type (mucous predominates) with serous demilunes (compound tubuloalveolar) - mucin. Bartholin’s duct - to submandibular ducts

52
Q

Oropharynx

A

conducts food to esophagus. stratified squamous epithelium (non-keratinized)

53
Q

Nasopharynx

A

conducts air to the larynx and trachae. Pseudostratified ciliated columnar epithelium (respiratory)

Histology (20 decks)

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