Details And Locations Of Specific Epithelia

Question 1

Where can you find simple cuboidal epithelium?

Answer 1

Surface of ovary, 
pigmented epithelium of retina, 
kidney tubules, 
glands and ducts, 
terminal bronchioles, 
choroid plexus, and 
anterior capsule of lens of eye. 
May have microvilli (brush border) on apical surface.

Question 2

Where can you find simple columnar epithelium?

Answer 2

Ciliated simple columnar epithelium can be found in the Upper respiratory tract, uterine tubes, uterus, paranasal sinuses, and the central canal of the spinal cord.

Non Ciliated columnar epithelium is found in the digestive tract beginning in the cardia of the stomach, gallbladder and in parts of the excretory ducts of glands.

Question 3

Where can you find stratified squamous epithelium?

Answer 3

Heavily keratinized is found in the epidermis with connective papillae and in the cornea without it.

Lightly or non keratinized can be found in the esophagus, vagina, lining of the mouth, tongue, and part of the epiglottis

Question 4

Where can you find stratified cuboidal?

Answer 4

Rarely found but may be in small areas of the anal mucosa, large excretory ducts, and part of the male urethra.

Question 5

Where can you find stratified columnar epithelium?

Answer 5

Rarely found but in the ducts of adult sweat glands, fornix of the conjunction of the eye, parts of male reproductive/urinary tract, pharynx and epiglottis.

Question 6

Where can you find pseudostratified epithelium?

Answer 6

Ciliated Pseudostratified columnar epithelium is found in the trachea.
Pseudostratified epithelium with stereocilia is found in the epididymis

Question 7

Where can you find transitional epithelium?

Answer 7

In the urinary system

Referred to as urothelium.

Question 8

What are the two types of epithelium?

Answer 8

Covering and lining and glandular.

Question 9

What are the functions of epithelial tissues?

Answer 9

• Protection (especially stratified squamous)
• maintain concentration differences (tight barriers and leaky barriers) lining of gallbladder and renal tubules.
• Secretion or absorption (usually simple or pseudostratified)
• the height of the cell reflects the level of secretory or absorptive activity
• simple columnar functions primarily in secretion of enzymes and mucous absorption of nutrients and fluids.

Question 10

Generally describe the basement membrane.

Answer 10

-It separates an epithelial layer from its connective tissue support.
- approximately 50-80 nm thick
- consists of basal lamina (made from epithelium)
And reticular lamina (made from connective tissue)

Question 11

What is the basal lamina composed of and what is the major component.

Answer 11

It’s made up of laminin, fibronectin, type 4 collagen, entactin, and proteoglycans. The major component is laminin.

Question 12

What is laminin?

Answer 12

A major component of the basal lamina
Made of 3 chains alpha beta and gamma
Has binding sites for integrins, type 4 collagen, entactin, and proteoglycans.

Question 13

What is fibronectin?

Answer 13

Protein made up of two polypeptide chains cross linked by sulfide bonds.
They have 2 different forms- cellular which is made by fibroblasts part of the extracellular matrix
And plasma which is secreted into the bloodstream by hepatocytes

Question 14

What does fibronectin have binding sites for

Answer 14

Heparin, integrins, collagen, and fibrin.

Question 15

Where can simple squamous epithelium be found?

Answer 15

Ducts, vessels, and other tubular structures.

Walls of alveoli, bowman’s capsules and inner surfaces of membranous labyrinth and tympanic membrane.