Epithelial Tissue Flashcards

1
Q

Define epithelial tissues.

A

The tissue that form the covering of the body externally as well as the internal covering of some organs and body spaces inside it.

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2
Q

What is the characteristic feature of epithelial tissue?

A

There is no intercellular space, cells joined together by carbohydrate derivatives, and cells resting upon avascular basement membrane.

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3
Q

What are the types of epithelial tissues?

A
  1. Simple epithelial tissue
  2. Compound/Stratified epithelial tissue
  3. Modified epithelial tissue
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4
Q

What are simple epithelial tissues?

A

The tissue having single layered arrangement of cells.

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5
Q

What are the types of simple epithelial tissue?

A
  1. Simple squamous
  2. Simple Cuboidal
  3. Simple Columnar
  4. Pseudostratified
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6
Q

What is simple squamous tissue also known as?

A

Pavement epithelium/Tessellated epithelium

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7
Q

Location of Simple Squamous Epithelium

A

covering of buccal cavity, coelom of large intestines, alveoli of lungs, capillaries, blood vessels, glomerulus of kidney.

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8
Q

What are the squamous epithelium in blood vessels called?

A

Endothelium

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9
Q

What are the squamous epithelium in coelom called?

A

Mesothelium

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10
Q

Location of Simple Cuboidal Epithelium.

A

kidney tubules, sweat glands, thyroid glands, germinal epithelium of ovary and testis, salivary glands, choroid, iris, retina of eye.

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11
Q

What are the two types of cuboidal epithelium?

A
  1. Ciliated Cuboidal- goblet cells, bronchioles, ducts of nephrons
  2. Brush-bordered Cuboidal- Proximal Convoluted Tubules (PCT)
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12
Q

Location of simple columnar epithelium.

A

Gall bladder, small intestinal glands, goblet cells of stomach, ureter and uterine wall, bile duct, pancreatic lobules, inner lining of alimentary canal

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13
Q

What are the two types of simple columnar epithelium?

A
  1. Ciliated columnar- oviduct, bronchioles
  2. Brush bordered columnar- microvilli of small intestine
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14
Q

What is pseudostratified epithelium? Why is it called so?

A

The simple epithelial tissue that appears to look stratified due to unequal size of cell resulting their free surface to be on different levels gives false multilayered appearance.

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15
Q

Location of Pseudostratified.

A

trachea, large bronchi, nasal epithelium, epididymis, vasa differentia, urinary duct.

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16
Q

What are the stratified epithelial tissues?

A

The multilayered epithelium with inner germ layer and outer layers.

17
Q

What is stratified squamous epithelium?

A

Epithelium with inner cuboidal germ cell and upper layer of squamous cell.

18
Q

What are the types of stratified squamous epithelium?

A
  1. Keratinized/Cornified Epithelium- Hair, Nails, Claws, Skin
  2. Non-Keratinized Epithelium- Vagina, Cervix, buccal cavity, anus
19
Q

Stratified Cuboidal Epithelium

A

Inner layer of germ cell(cuboidal or columnar) and outer layer of cuboidal cells.

20
Q

Locations of Stratified Cuboidal Epithelium

A

Inner linings of ducts Sweat glands, Salivary glands, mammary glands, pancreatic duct and female urethra.

21
Q

Locations of Stratified columnar epithelium

A

linings of ducts of mammary glands, larynx, trachea, vasa differentia, conjunctiva of eye.

22
Q

What are transitional epithelium?

A

Also known as urothelium they lack basement membrane and has stretchable quality.
Upper layer- dome shaped
Lower layer- club shaped

23
Q

Location of transitional epithelium

A

Urinary bladder, Urethra, uterus and ureter

24
Q

What are the modified epithelium?

A

The epithelial tissues that have been modified for special functions is called modified epithelium.

25
Q

What are they usually composed of?

A

Cuboidal or columnar cells

26
Q

What are the types of modified epithelium?

A
  1. Ciliated epithelium
  2. Sensory Epithelium
  3. Germinal Epithelium
  4. Glandular Epithelium
27
Q

Location of ciliated epithelium

A

skin, uriniferous tubules, sperm ducts, trachea, bronchi, oviduct.

28
Q

Location of sensory epithelium

A

lining of nasal cavity, tongue, internal ear, retina of eye

29
Q

Location of germinal epithelium

A
  1. Inner linings of testes and ovary
30
Q

What are glandular epithelium?

A

The epithelium modified such that it secretes chemical substances essential for the body such as hormones and enzymes.

31
Q

Types of gland on the basis of number of cells.

A
  1. unicellular gland - secretory goblet cell
  2. multicellular gland- swear gland, gastric glands etc.
32
Q

Types of gland on the basis of presence of ducts.

A
  1. endocrine glands - ductless glands, producing hormones : pituitary, thymus, thyroid, adrenal gland
  2. exocrine glands- ducted glands, producing enzymes: tear gland, salivary gland, sweat gland.
  3. heterocrine glands/mixed glands- testes, ovary and pancreas
33
Q

Types of gland on the basis of mode of secretion.

A
  1. merocrine- no damage to cell (goblet cell, salivary gland, intestinal gland, sweat gland and pancreatic gland
    2.apocrine gland-loss and damage to some part of cell( mammary gland, molls gland of eye)
    3.holocrine gland-loss of whole cell(Sebaceous gland)
34
Q

Types of glands on the basis of shape and structure

A
  1. simple glands
  2. compound glands
35
Q

Simple glands

A

single unbranched duct
a. simple tubular gland-intestinal crypts in intestine
b. simple coiled tubular gland- sweat gland
c. simple branched tubular gland-gastric and Brunner’s gland
d. simple alveolar gland-mucus secreting gland of frog
e. simple branched alveolar gland- oil glands

36
Q

Compound glands

A

having branched duct
a. compound tubular- salivary gland, testes and exocrine part of pancreatic duct
b. compound alveolar-
mammary and pancreatic
c. compound tubulo-alveolar gland
cowpers gland, salivary and mammary gland

37
Q

Types of glands on the basis of secretions

A
  1. mucous- mucus secretion - goblet cells
    2.serous- serous fluid- parotid salivary, intestinal and sweat gland
  2. mixed - both mucocyte and serocyte- gastric and pancreatic secretion