ToB - Epithelia Flashcards

0
Q

What epithelia does the ectoderm produce?

A

That of the skin and cornea.

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1
Q

What are epithelia?

A

Sheets of contiguous cells of varied embryonic origin, that cover the external surfaces of the body and line the internal surfaces.

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2
Q

What epithelia does the mesoderm produce?

A

Urogenital tract, blood and lymph vessels and pleural/peritoneal/pericardial sac lining.

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3
Q

What epithelia does the endoderm give?

A

The GI tract, respiratory tract, liver and most glands.

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4
Q

Where is the basal membrane found?

A

It lies between the layer of epithelial cells and the connective tissue.

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5
Q

What is the structure of the basal membrane?

A

Thin, flexible and acellular, consisting of the basal lamina laid down by the epithelial cells themselves.
It’s thickness can be increased by reticular fibrils elaborated by the connective tissue.

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6
Q

What is the function of the basement membrane?

A

Serves as a cellular/molecular filter.

It is a strong layer for epithelia to adhere to.

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7
Q

What is the location and function of simple squamous epithelia?

A

Location - lining capillaries, alveoli and body cavities.

Function - thin for gas exchange, lubrication (secretes fluid).

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8
Q

What is the location and function of simple cuboidal epithelia?

A

Location - surface of ovary, small ducts of exocrine glands.

Function - secretion and absorption (coupled to synthesise hormone), protection and conduit.

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9
Q

What is the location and function of simple columnar epithelia?

A

Location - ductuli efferentes of testis, uterus, oviducts, GI tract

Function - Absorption, secretion, lubrication.

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10
Q

What is the location and function of pseudostratified epithelia?

A

Location - resp tract above trachea, lacrimal sac.

Function - secretion, conduit, absorption.

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11
Q

What is the location and function of non keratinised stratified squamous epithelia?

A

Location - vagina, larynx, oesophagus, cornea

Function - reduce water loss, protection.

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12
Q

What is the location and function of keratinised stratified squamous epithelia?

A

Location - skin surface, a little in oral cavity.

Function - protection, reduce water loss, prevent ingress of microbes.

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13
Q

What is the location and function of transitional epithelia?

A

Location - bladder and rest of urinary tract

Function - distensibility, protection.

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14
Q

What is the location of stratified cuboidal epithelia and stratified columnar?

A

Location of cuboidal - lining ducts of sweat glands

Location of columnar - conjunctiva of eye

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15
Q

How do epithelial cells renew?

A

Turnover depends on cell function and location but it still occurs at a constant rate.

Some epithelia aren’t renewed but proliferate instead to replace damaged/lost cells.

16
Q

What are microvilli and where are they found?

A

Apical extensions of the s.a. that increase absorption, mostly on simple columnar cells of the small intestine.

17
Q

What are stereocilia and where are they found?

A

They are very long microvilli, found on the surface of the ductus deferens and epididymis.

18
Q

What are cillia and where are they found?

A

They rise from a centriole in a 9+2 configuration, containing micro tubules with ATPase to allow them to beat in coordinated waves.
They are found in the trachea and Fallopian tubes.