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Periodontics > Chapter 2 Microscopic Anatomy > Flashcards

Chapter 2 Microscopic Anatomy Flashcards

1
Q

Which of the following tissues serves as a covering tissue for the outer services of the body and a lining tissue for body cavities such as the mouth, stomach, and intestines?
A. Basal lamina
B. Connective tissue
C. Epithelial tissue
D. Keratinized tissue

A

C. Epithelial tissue

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2
Q

Which of the following tissues fills the spaces between the tissues and organs of the body?
A. Basal lamina
B. Connective tissue
C. Epithelial tissue
D. Keratinized tissue

A

B. Connective tissue

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3
Q

Which of these epithelial layers is comprised of cells with nuclei that act as a cushion against mechanical stress and wear?
A. Nonkeratinized layer
B. Keratinized layer
C. Extracellular ground layer
D. Collagen layer

A

nonkeratinized layer

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4
Q

Epithelial cell junctions are cellular structures that can attach:
A. An epithelial cell to a neighboring epithelial cell
B. An epithelial cell to a basal lamina
C. An epithelial cell to elastin fibers
D. Both A and B

A

Both A and B

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5
Q

The function of cell junctions is to:
A. Make it easy for cells to detach from each other to facilitate migration of cells
B. Allow cells to bind together to function as a strong structural unit
C. Fill the spaces between neighboring epithelial cells
D. Both A and B

A

B. Allow cells to bind together to function as a strong structural unit

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6
Q

A cell junction that connects an epithelial basal cell to the basal lamina is termed:
A. Hemidesmosome
B. Desmosome
C. Epithelial ridge
D. Connective tissue papilla

A

A. Hemidesmosome

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7
Q

In MOST places in the body, the epithelium meets the connective tissue in a wavy, uneven junction.
A. True
B. False

A

A. True

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8
Q

The deep extensions of epithelium that reach down into the connective tissue are termed:
A. Hemidesmosomes
B. Desmosomes
C. Epithelial ridges
D. Connective tissue papillae

A

C. Epithelial ridges

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9
Q

Connective tissue is comprised of a gel-like substance, fibers, and few cells
A. True
B. False

A

A. True

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10
Q

The sulcular and junctional epithelium are keratinized epithelial tissues.
A. True
B. False

A

B. False

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11
Q

The epithelium that forms the base of the sulcus and joins the gingiva to the tooth is called the:
A. Oral epithelium
B. Sulcular epithelium
C. Junctional epithelium
D. Squamous epithelium

A

C. Junctional epithelium

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12
Q

In the junctional epithelium, epithelial cell attaches to neighboring epithelial cells via:
A. Desmosomes
B. Hemidesmosomes
C. External basal lamina
D. Internal basal lamina

A

A. Desmosomes

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13
Q

The junctional epithelium attaches to the tooth surface via the:
A. Desmosomes and the internal basal lamina
B. Desmosomes and the external basal lamina
C. Hemidesmosomes and the internal basal lamina
D. Hemidesmosomes and the external basal lamina

A

C. Hemidesmosomes and the internal basal lamina

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14
Q

The junctional epithelium attaches to the connective tissue via the:
A. Desmosomes and the internal basal lamina
B. Desmosomes and the external basal lamina
C. Hemidesmosomes and the internal basal lamina
D. Hemidesmosomes and the external basal lamina

A

D. Hemidesmosomes and the external basal lamina

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15
Q

Which of the following is NOT a function of the supragingival fiber bundles:
A. Brace the free gingiva against the tooth
B. Suspends the tooth in its bony socket
C. Allow the free gingiva to withstand the frictional forces
D. Connect adjacent teeth to one another

A

B. Suspends the tooth in its bony socket

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16
Q

The periodontal ligament is a thin sheet of fibrous tissue located between the ____ and the ____

A

Roots of teeth and cementum

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17
Q

An important function of the cementum of the tooth is to attach the periodontal ligament fibers to the tooth.
A. True
B. False

A

A. True

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18
Q

Alveolar bone is mineralized connective tissue.
A. True
B. False

A

A. True

19
Q

Two neighboring epithelial cells in the gingival epithelium are attached to one another by which type of cell junction?

A

Desmosome

20
Q

A gingival epithelial cell is attached to the basal lamina. Which type of cell junction allows the cell to attach to the basal lamina?

A

Hemidesmosomes

21
Q

Which of the following is a mesh-like material that surrounds the cells and provides a framework?
A) Mast cell
B) Extracellular matrix
C) Nucleus
D) Collagen fiber bundle

A

B) Extracellular matrix

22
Q

A dental hygienist gently inserts a calibrated periodontal probe into a sulcus. One side of the working end of the probe touches the tooth surface as the probe is inserted. During the process of insertion, the other side of the probe is touching what anatomical structure?

A

Sulcular epithelium

23
Q

A dental hygienist inserts a periodontal probe into a deep 6mm periodontal pocket until he reaches the base of the pocket. What anatomical structure forms the base of the periodontal pocket?

A

Juntional epithelium

24
Q

A patient has a healthy periodontium. If the hygienist could see the microscopic structures of this patients periodontium, how would the interface of the junctional epithelium with the gingival connective tissue appear?

A

a smooth interface

25
Q

The gingival connective tissue would be very weak and tend to fall apart if not for which of the following structures?
A) Connective tissue cells
B) Epithelial tissue cells
C) Extracellular matrix
D) Intracellular matrix

A

C)Extracellular matrix

26
Q

The mat of the extracellular matrix that separates epithelial sheets from underlying connective tissue is called:

A

Basal lamina

27
Q

True or false? Epithelium does not contain blood vessels. Epithelium is a nonvital tissue that does not require nourishment to maintain cells.

A

first statement is true, second is false

28
Q

All of the following statements about keratinization are true except:
A) Keratinized epithelial cells have no nulcei.
B) The heaviest keratinized epithelium of the body is found on the palms of the hands and soles of the feet.
C) Keratinized cells are waterproof.
D) Although keratinized tissue is very strong, it is also very flexible.

A

D) although keratinized tissie is very strong, it is also very flexible

29
Q

All of the following are examples of connective tissue except?

A) Cartilage

B) Lymph nodes

C) Bone marrow

D) The outer most layer of the skin

A

D) The outer most layer of the skin

30
Q

Which of the following tooth structure is an example of epithelial tissue?

A)Dentin

B) Cementum

C) Enamel

D) Pulp

A

C) Enamel

31
Q

All of the following are areas of the gingival epithelium except:
A) Free gingival epithelium
B) Junctional epithelium
C) sulcular epithelium
D) oral epithelium

A

A) Free gingival epithelium

32
Q

All of the following are true of oral epithelium, except:
A) It may be keratinized or parakeratinized.
B) The junction with connective tissue in health has a wavy interface.
C) It is permeable, allowing for flow of crevicular fluid.
D) It covers the outer surface of free gingiva and attached gingiva.

A

C) It is permeable, allowing for flow of crevicular fluid.

33
Q

Which of the following is true about junctional epithelium?
A) they consist of loosely packed epithelial cells.
B) The cells have no nulcei.
C) The are connected to neighboring epithelial cells by desmosomes.
D) The cells are keratinized.

A

C) they are connected to neighboring epithelial cells by desmosomes

34
Q

What percent of all cases does cementum overlap enamel?

A

60%

35
Q

What percent of cases does cementum meet enamel?

A

30%

36
Q

True or false? Osteoblasts are cells that initiate mineralization of bone, and osteoclats remove mineral materials from bone.

A

both statements are true

37
Q

The _________ surrounds the cells of a tissue and is comprised of fibers and a gel-like substance.

A

extracellular matrix

38
Q

The epithelium of the skin consists of many closely packed ______ and a thin ______.

A

epithelial cells; basal lamina

39
Q

The epithelium of the skin rests on a supporting bed of ________ .

A

connective tissue

40
Q

The epithelium does not contain _______ ; nourishment is received from blood vessels in the underlying ______ .

A

blood vessels; connective tissue

41
Q

Function of the wavy tissue

Enhances the _______ of the epithelium to the connective tissue by _______ the surface area of the junction between the two tissues

A

adhesion; increasing

42
Q

Function of the wavy tissue

Increases the area from which the _____ can receive _____ from the underlying connective tissue

A

epithelium; nourishment

43
Q

In most cases, the epithelium meets the connective tissue at an _____ , wavy border. ______ extend down into the connective tissue. Connective tissue _____ extend upward into the epithelium.

A

uneven; Epithelial ridges; papillae

44
Q

The epithelial–connective tissue interface is the site of the _______ membrane zone, a complex structure mostly _____ by the epithelial cells.

A

basement; synthesized

Periodontics (2 decks)

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