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Histology -- Zach H. > Epithelium > Flashcards

Epithelium Flashcards

1
Q

What’s the characteristic surface difference between epithelium and epithelioid tissues?

A

Epithelial tissue typically has a free surface, whereas epithelioid tissues resemble epithelium, but lack a free surface.

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2
Q

True or False: Epithelial tissue is the most cellular tissue in the body?

A

True

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3
Q

What epithelia classification does mesothelium fall under?

A

Simple Squamous Epithelium

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4
Q

What molecular complexes tightly bind epithelium together?

A

Tight Junctions

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5
Q

Name at least 1 epithelial tissue that is derived from ectoderm.

A

The skin epidermis and glands.

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6
Q

The lining of the gastrointestinal tract (including glands) is derived from what, embryologically?

A

Endoderm

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7
Q

Name at least two epithelial tissue examples that is derived from mesoderm.

A

The lining of the blood vessels, mesothelium, and the Bowman’s capsule.

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8
Q

What is the most abundant collagen found in the basal lamina?

A

Type IV collagen.

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9
Q

What type of proteins are found in the basal lamina that makes it PAS positive?

A

Glycoproteins

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10
Q

Do lymph vessels and hepatic sinusoids have a basal lamina?

A

NO, they do not have a basal lamina.

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11
Q

What two components make up a basement membrane?

A

Basal Lamina and Reticular Lamina

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12
Q

What is the order of the reticular lamina, epithelium, basal lamina, and the connective tissue starting at the apical surface of the epithelial tissue?

A

Epithelium -> basal lamina -> reticular lamina -> connective tissue

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13
Q

What 3 components make up the reticular lamina?

A

argyrophilic fibers, reticular fibers, and glycoproteins.

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14
Q

Name two of the three major functions of the basement membrane.

A

1) Selective Filtration Barrier
2) Scaffold for embryogenesis and regeneration
3) Stabilization of tissue shapes

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15
Q

Even through epithelial tissue does not have vessels, can it be innervated?

A

Yes, epithelial tissues may be innervated.

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16
Q

Which layer of cells do you use to give the epithelial tissue its classification?

A

Superficial Layer

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17
Q

Give two areas in the body where lightly keratinized stratified squamous epithelium could be found?

A

Esophagus and Vagina

18
Q

Is transitional epithelium a simple or stratified epithelium? Also, what about pseudostratified epithelium?

A

Simple, both transitional and pseudostratified epithelium are simple classification, NOT stratified.

19
Q

What are the 3 apical surface modifications that can be found on epithelial tissue?

A

Cilia, Stereocilia, and Microvilli

20
Q

What are the domains and features of a Polarized Cell?

A
  • Apical Domain (with differentiations of cilia, microvilli, or stereocilia) and that domain must face a lumen or external environment
  • Basolateral Domain
  • Tight Junctions (intercelleular junctions)
  • Basement Membrane
21
Q

Name 2 tubular structure lumina that simple squamous epithelium covers?

A

Ducts and Vessels (also other tubular structures too)

22
Q

Give some examples of where simple squamous epithelium is found?

A
  • Walls of alveoli
  • Bowman’s capsules
  • Inner surfaces of membranous labyrinth and tympanic membrane
23
Q

Where is simple cuboidal epithelium found in the kidney? Also, what apical surface modifications can be found on it in the kidney? Does it always have this modification?

A

In the kidney tubules with a brush boarder (microvilli). No, does not always have a brush boarder.

24
Q

Give example of where simple cuboidal epithelium can be found in the body.

A
  • surface of ovary
  • pigmented epithelium of retina
  • glands and ducts
  • terminal bronchioles
  • choroid plexus
  • anterior capsule of lens of eye
25
Q

Where can simple ciliated columnar epithelium be found in the body?

A
  • upper respiratory tract
  • uterine tubes
  • uterus
  • paranasal sinuses
  • central canal of the spinal cord
26
Q

Where is simple non-ciliated columnar epithelium found in the body?

A
  • digestive tract beginning with the cardia of the stomach
  • gall bladder
  • in parts of the excretory ducts of glands
27
Q

What apical domain modification is sometimes found on simple columnar epithelium of intestinal cells?

A

Striated Border (microvilli)

28
Q

What kind of epithelium has a striated border and where is it located?

A

simple columnar and in the intestine

29
Q

What kind of epithelium has a brush border and where is it located?

A

simple cuboidal and in the kidney tubules

30
Q

Where is a few examples of where heavily keratinized stratified squamous is found?

A

Epidermis with connective tissue papillae

Cornea without connective tissue papillae

31
Q

Does heavily keratinized squamous epithelium in the cornea have connective tissue papillae?

A

No, only in the epidermis.

32
Q

What type of epithelium is found in the lining of the mouth, tongue, and part of the epiglottis?

A

lightly or non-keratinized squamous epithelium

33
Q

What type of epithelium can sometimes be found in small areas of the anal mucosa, large excretory ducts of some glands, and part of the male urethra?

A

STRATIFIED CUBOIDAL EPITHELIUM

34
Q

If stratified columnar epithelium were to be found, where would you expect to find it?

A
  • ducts of adult sweat glands
  • fornix of the conjuctiva of the eye
  • parts of the male reproductive/urinary tract
  • pharynx
  • epiglottis
35
Q

What apical domain modifications can be found on pseudostratified epithelium in the epididymis?

A

stereocilia

36
Q

What structure in the body has ciliated pseudostratified columnar epithelium?

A

Trachea

37
Q

What are the 3 functions of epithelial tissues?

A
  • protection (especially stratified squamous epithelium)
  • maintain concentration differences (tight barriers & leaky barriers)
  • secretion or absorption (typically simple or pseudostratified)
38
Q

Give two examples of epithelial tissue that has leaky barriers and then name the type of epithelium tissue these barriers would be found in.

A

*lining of gallbladder
*proximal convoluted portion of renal tubule
Would be found in simple columnar epithelium

39
Q

True of False: the height of the cell often reflects the level of secretory or absorptive activity of epithelial tissue.

A

True

40
Q

Does epithelium have vessels?

A

NO

Histology -- Zach H. (21 decks)

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