Epithelia

Question 1

Simple squamous

Answer 1

• the cytoplasm is thinner than the nucleus giving a “fried egg” appearance
• single layer; found in serosa/capsule

Question 2

Serosa/capsule

Answer 2

• simple squamous that covers outside of an organ
• look at the outer edge of the organ

Question 3

Visceral pleura

Answer 3

• the serosa on the surface of the lungs
• simple squamous epithelial layer

Question 4

Parietal peritoneum

Answer 4

• simple squamous epithelial layer along with the connective tissue lining the abdominal wall is a serosa

Question 5

Visceral peritoneum

Answer 5

• serosa that covers the internal organs

Question 6

Mesentery

Answer 6

• the layer that suspends the organs in the body cavity
• is continuous with the parietal peritoneum that suspends the organs

Question 7

Areolar spread

Answer 7

• a piece of the mesentery of the gut

Question 8

Simple cuboidal epithelium

Answer 8

• a single layer of cells whose height and depth roughly equals their width (3D)
• width=height=length

Question 9

Secretory acini

Answer 9

• simple cuboidal epithelium
• can call acini a duct
• small tight duct that looks like a pizza pie

Question 10

Simple columnar epithelium

Answer 10

• the length of a cell exceeds its width

Question 11

Microvilli

Answer 11

• outward projections of the cell membrane whose function is to increase the surface area of the cell

Question 12

Cilia

Answer 12

• have microtubules and their function is to actively sweep things along the lumenal wall

Question 13

Ciliated Pseudostratified columnar epithelium

Answer 13

• as wide and tall as nucleus
• see cilia, think pseudostratified
• means it is really simple
• commonly found in trachea

Question 14

Stereocilia

Answer 14

• not cilia
• are actually very long microvilli

Question 15

Stratified cuboidal epithelium

Answer 15

• 2 cell thick
• remember width=height=length

Question 16

Keratinized Stratified squamous epithelium

Answer 16

• keratin is the outer most layer
• skin and sole of foot

Question 17

Non-keratinized stratified squamous epithelium

Answer 17

• the epithelium lining the esophagus in humans

Question 18

Transitional epithelium

Answer 18

• type of stratified epithelium (3-5 cell layers thick)
• found only in the unitary tract
• cap cells lie on the surface of the epithelium

Question 19

Cap cells

Answer 19

• large, covering more than one cell below them
• often stain more intensely
  May not be seen in every field

Question 20

Unicellular glands

Answer 20

• specialized cells which secrete their substance onto an epithelial surface
• goblet cell or mucous cell
• simple columnar epithelium

Question 21

Goblet cells

Answer 21

• the secretion is mucus
• its base, which contains the nucleus, is narrow; however the portion near the apical surface is wide and round and contains most of the mucus

Question 22

Multicellular glands

Answer 22

• simplest is the tubular gland
• the inner secretory portions of the glands often expand to form specialized structures: alveoli and acini
• often the ducts of the glands are covered by thin layers of smooth muscle

Question 23

Alveoli

Answer 23

• large sac-like expansions
• the lumina are wide and a considerable amount of secretion May be stored in them
• simple squamous epithelium

Question 24

Acini

Answer 24

• small clusters of cells wrapped around a small lumen which contains little or no secretion
• pizza pie