Oral Histo Study guide (the first one)

Question 1

Paracrine

Answer 1

Cell to cell communication/regulation

Question 2

Autocrine

Answer 2

Cell to self-communication-communication

Question 3

At what stage is the blastocyst between 3-4 days?

Answer 3

Morula

Question 4

How long does the blastocyst take to develop into a blastula?

Answer 4

4-5 days

Question 5

How long does the blastocyst take to develop into a gastrula?

Answer 5

8-16 weeks

Question 6

During what time period is the blastocyst most susceptible to teratogens?

Answer 6

8-16 weeks of development

Question 7

What layer does the notochord arise from?

Answer 7

Mesoderm

Question 8

What layer does the neural tube come from?

Answer 8

Ectoderm

Question 9

What layer gives rise to the enamel and CNS?

Answer 9

Ectoderm

Question 10

Where does the first brachial arch occur?

Answer 10

Where the mandible is going to grow

Question 11

To what area does the 6th arch contribute to cartilage?

Answer 11

The throat

Question 12

Where is Reichert’s cartilage found?

Answer 12

In the 2nd pharyngeal arch

Question 13

What does Reichert’s cartilage form?

Answer 13

The stapes

Question 14

A brachial groove is an ____ arch separation point

Answer 14

external

Question 15

A brachial pouch is an ____ arch separation point

Answer 15

internal

Question 16

What part of the skull forms the face?

Answer 16

Viscerocranium

Question 17

What is the only membranous bone below the neck?

Answer 17

Clavicle

Question 18

Alveolar bone is similar to what type of bone, due to having a high protein and low mineral content?

Answer 18

Woven bone

Question 19

Occipital bone is the only ___ bone in the head

Answer 19

endochondral

Question 20

Epiphyseal plate is where growth occurs and is made of what type of cartilage?

Answer 20

Hyaline

Question 21

Hyaline cartilage is laid on what type of collagen?

Answer 21

1

Question 22

What are the pits on the surface of the bone that an osteoclast sits in?

Answer 22

Howship’s lacunae

Question 23

What type of epithelium constitutes oral epithelium?

Answer 23

Stratified squamous epithelium, can be both keratinized and non-keratinized

Question 24

The dental lamina is a lyer over the ectomesenchyme that goes on to form what two structures?

Answer 24

Maxilla and mandible

Question 25

Ameloblast forms what?

Answer 25

Enamel

Question 26

The dental papilla forms what, and contains what type of cell?

Answer 26

Forms dentin, contains odontoblasts

Question 27

Dental follicle is a sac that holds what two structures?

Answer 27

The developing enamel organ and dental papilla

Question 28

What does the enamel organ contain? What does it sit over?

Answer 28

It contains the outer and inner enamel epithelium and sits over the dental papilla

Question 29

What does the Hertwig epithelial root sheath initiate?

Answer 29

Formation of the dentin in a tooth's root

Question 30

The primary epithelial band gives rise to what two structures?

Answer 30

1. Dental lamina (first evidence of tooth development at 6th week in utero) 2. Vestibular lamina (space bordered by the junction of the gingiva and the tissue of the inner cheek)

Question 31

In what stage of amelogenesis do cells become ameloblasts and repolarize by reciprocal induction?

Answer 31

Secretory

Question 32

What responsibility does Tome's processes have in regards to amelogenesis?

Answer 32

They lay down inter-rod enamel that is made of hydroxyapatite

Question 33

What is the protein in enamel that constitutes 90% of the enamel matrix?

Answer 33

Amelogenin

Question 34

When are intrinsic fibers present in the mouth?

Answer 34

When repair is done.

Question 35

What are the four types of calcified tissue in the human body?

Answer 35

Bone, cementum, dentin and enamel

Question 36

What is the collagen that is the primary component of bone, cementum and dentin, and comprises the PDL

Answer 36

Type 1 collagen

Question 37

What is the range of the anticaries impact of fluoride?

Answer 37

0.7 to 1 ppm (1 ppm= 1 mg/kg)

Question 38

What is the range of mild fluorosis? What is another term for this?

Answer 38

2-5 ppm, "mottled enamel"

Question 39

What is the amount of fluoride one must ingest to suffer severe fluorosis? What does this cause?

Answer 39

5 and above ppm, causing hypoplastic pits

Question 40

What happens to someone who ingests 100 and above ppm of fluoride?

Answer 40

Respiratory failure

Question 41

What is hypoplasia?

Answer 41

Incomplete development of a tissue or organ (i.e. enamel)

Question 42

What is the most common manifestation of orofacial clefts?

Answer 42

Lip and palate, at 45%

Question 43

What are three important clinical manifestations of Pierre Robin syndrome?

Answer 43

1. Micrognathia 2. Cleft palate 3. Glossoptosis

Question 44

Where are commissural lip pits located? Are they common or not?

Answer 44

At the corners of the mouth on the vermillion border, common

Question 45

Where are paramedial lip pits? Common or not?

Answer 45

Lower lip, rare

Question 46

What are three results of Ascher syndrome?

Answer 46

1. Double lip 2. Blepharochalasis (folds of tissues on upper eyelids) 3. Thyroid enlargement

Question 47

What are Fordyce granules? Are they common?

Answer 47

Sebaceous glads on the oral mucosa, very common at 80% of people