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A&P I > Classification of Epithelial tissue (Pt.2) > Flashcards

Classification of Epithelial tissue (Pt.2) Flashcards

1
Q

What are the two parts of epithelium ( like first & last name) and explain

A

FIRST NAME
Simple epithelia:
- single layer

Stratified epithelia:
- many layers, stacked on top of each other

LAST NAME
Cuboidal:
- boxlike, approx as tall as they are wide

Squamous:

  • flattened & scale like
  • nucleus is a flattened disc

Columnar:

  • tall/ column shaped
  • nucleus is elongated frm top to bottom, usually located closer to cell base
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2
Q

Where is Simple Epithelia found

A
  • Where absorption, secretion, filtration occur & thin epithelia is desirable
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3
Q

Where is Stratified Epithelia found

A
  • Common in high abrasion areas, where protection is important such as skin & lining of the mouth
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4
Q

How to identify Simple & Stratified Epithelia

A

Simple Epithelia:
- easy to classify by cell shape bc all of the cells usually have the same shape

Stratified Epithelia:

  • cell shape differ in diff layers
  • to avoid ambiguity, named based on shape in apical layer
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5
Q

Explain Simple Squamous epithelium

A
  • Single layer of flattened cells w/ little cytoplasm

- very thin & permeable for filtration, diffusion

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6
Q

LOCATION of Simple Squamous Epithelium found

A
  • Kidney glomeruli, airsacs of lungs, lining of heart, blood vessels, lymphatic vessels, serosae
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7
Q

Explain Simple Cuboidal Epithelium

A
  • Single layer of cube shaped cells

FUNCTION: secretion/ absorption

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8
Q

LOCATION of Simple Cuboidal Epithelium

A
  • Kidney tubules, ducts & secretory portions of small glands, ovary surface
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9
Q

Explain Simple Columnar Epithelium

A
  • single layer of tall cells

FUNCTION: absorption secretion of mucus, usually w/ microvilli & goblet cells

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10
Q

LOCATION of Simple Columnar Epithelium

A
  • digestive tract, gall bladder, excretory ducts, small bronchi, uterine tube , uterus
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11
Q

Explain Pseudostratified Columnar Epithelium

A
  • single layer ; all cells touch basement membrane but not all are exposed to free surface. usually ciliated & w/ goblet cells
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12
Q

LOCATION of Psuedostratified Columnar

A
  • trachea, upper respiratory tract, nonciliated type in male sperm carrying ducts and ducts of large glands
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13
Q

Explain Stratified Squamous Epithelium

A
  • Several layers, only free surface layer is squamous- for protection against wear and tear-top layer is continually replaced
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14
Q

LOCATION of Stratified Squamous Epithelium

A
  • Moist lining of esophagus, mouth, vagina, epidermis of skin (keratinized)
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15
Q

Explain Stratified Cuboidal Epithelium

A
  • usually two layers of cuboidal cells, rare
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16
Q

LOCATION of Stratified Cuboidal Epithelium

A
  • Mostly in ducts of some of the larger glands (Sweat glands, Mammary glands)
17
Q

Explain Stratified Columnar Epithelium

A
  • Only free surface cells are columnar, limited distribution
18
Q

LOCATION of Stratified Columnar Epithelium

A
  • pharynx, male uretha, lining some glandular ducts, transition areas or junctions btw two other types of epithelia
19
Q

Explain Transitional Epithelium

A
  • Several layers- free surface cells can change shape w/ distension of organ
20
Q

LOCATION of Transitional Epithelium

A
  • Urinary bladder
21
Q

What are the special types of Epithelium

A
  • Endothelium, Mucous membranes, Cutaneous membrane. Serous membrane
22
Q

Explain Endothelium

A

Simple squamous- lines the cavity of all circulatory organs

23
Q

LOCATION of Endothelium

A
  • heart, blood vessels, lymphatics (reduce friction)
24
Q

Explain Mucous membranes (mucosae)

A
  • mostly stratified squamous or simple columnar epithelium- lines the cavities which open to outside
  • most secrete mucous- all are absorptive and/or secretory- epithelial sheet w/ basement membrane on top of a connective tissue lamina propria (areola CT)
25
Q

LOCATION of Mucous membranes

A
  • mouth, esophagus, nasal, bronchi
26
Q

Explain Cutaneous membrane (skin)

A
  • keratinized, stratified squamous epidermis (epithelium) on top of a CT dermis
27
Q

LOCATION of Cutaneous membrane

A
  • Skin
28
Q

Explain the Serous membrane

A
  • both parietal/visceral components made of simple squamous (mesothelium) on top of loose CT- mesothelial cells secrete serous fluid
29
Q

LOCATION of Serous membrane

A
  • lines coelom

A&P I (6 decks)

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