Histology Lecture 3: Characteristics and classification of epithelial tissues

Question 1

T or F: Epithelial tissue is the most cellular tissue in the body

Answer 1

True

Question 2

Epithelial tissue classifications (they are classified according to what?)

Answer 2

Shape and # of layers

Question 3

T or F: Epithelial tissues have large intercellular matrix

Answer 3

False

Question 4

T or F: Epithelial tissues typically display free surfaces

Answer 4

True

Question 5

T or F: Epithelial tissues line body cavities and cover body surfaces

Answer 5

True

Question 6

Epithelial tissues form which parts of glands

Answer 6

Secretory and Excretory parts

Question 7

Are epithelial tissues innervated

Answer 7

They may be

Question 8

Apical domain

Answer 8

surface of cell in contact with a lumen or external environment

Question 9

Basolateral domain

Answer 9

Surface of cell in contact with neighboring cells or the basal lamina

Question 10

T or F: Epithelial tissues contain blood vessels

Answer 10

False

Question 11

Epithelial tissues are derived from what

Answer 11

Ectoderm
Endoderm
Mesoderm

Question 12

Surface modifications of epithelial tissues

Answer 12

Cilia
Microvilli (brush border)
Stereocilia (longer and branched compared to microvilli)

Question 13

Epithelial tissues are classified by

Answer 13

shape
cell layers
surface modifications
Presence or absence of keratin

Question 14

What is pseudostratified epithelium

Answer 14

Simple epithelium, appears stratified because of nuclei locations but all cells are in contact with basal lamina

Question 15

What is transitional (urothelium) epithelium

Answer 15

Simple epithelium, dome shaped surface and nuclei location gives appearance of stratified. Found in urinary tract

Question 16

Simple squamous locations

Answer 16

Lumina of ducts, vessels and other tubular structures.

Walls of alveoli, bowmans capsules and inner surfaces of labrynth and TM

Question 17

Simple cuboidal location and apical modification

Answer 17

May have brush border
Found on surface of ovary, pigmented epithelium of retina, kidney tubules, glands and ducts, terminal bronchioles, choroid plexus, anterior capsule of lens of eye

Question 18

Simple columnar apical modifications

Answer 18

Microvilli, cilia

Question 19

Location of simple columnar w/ microvilli

Answer 19

Intestinal cells

Question 20

Location of simple columnar w/ cilia

Answer 20

Upper respiratory tract, uterine tubes, uterus, sinuses, central canal of spinal cord

Question 21

Location of simple columnar w/o cilia

Answer 21

digestive tract beginning with cardia of stomach, gall bladder, excretory ducts

Question 22

Heavily keratinized stratified squamous location

Answer 22

epidermis w/CT papillae

cornea w/o CT papillae

Question 23

Light or non keratinized stratified squamous location

Answer 23

esophagus, vagina, mouth lining, tongue, epiglottis

Question 24

Stratified cuboidal location

Answer 24

seldom found but:
anal mucosa
large excretory ducts of some glands
parts of male urethra

Question 25

stratified columnar location

Answer 25

seldom found but:
ducts of adult sweat glands
pharynx
epiglottis

Question 26

Pseudostratified w/cilia location

Answer 26

trachea

Question 27

Pseudostratified w/stereocilia location

Answer 27

epididymis

Question 28

Two function types of epithelium

Answer 28

Covering and lining

Glandular

Question 29

Main functions of epithelium

Answer 29

Protection (especially stratified squamous)

Maintaining cell concentration differences

Question 30

Types of epithelia involved in secretion or absorption

Answer 30

Simple or pseudostratified

Question 31

simple columnar functions primarily in what

Answer 31

secretion of enzymes and mucous, absorption of nutrients and fluids

Question 32

microvilli structure

Answer 32

Actin filament core, cross linked by villin and fimbrin, distal end capped by formin. Core extends into terminal web.

Question 33

microvilli (brush border) function

Answer 33

increase surface area of absorption

Question 34

Microvilli location (think what function is)

Answer 34

intestinal epithelium & parts of renal tubules

Question 35

structure of cilium

Answer 35

9 peripheral doublets + 2 central pair of microtubules

Question 36

alpha tubule structure

Answer 36

13 protofilamints, pairs of dynein arms projecting to beta tubule

Question 37

Beta tubule structure

Answer 37

10-11 protofilaments