Epithelial Tissue Flashcards
Which 3 places is stereocilia found?
epididymis, inner ear, and ductus deferens
State the difference between endothelium and mesothelium
Endothelium lines blood vessels; mesothelium lines the body cavities (pleura, pericardium, and peritoneum)
What is the main difference between serosa and mucosa?
Serosa attaches to the basement membrane so is underneath the epithelial cells; mucosa lies on the topmost layer
State 3 differences between microvilli and stereocilia
- microvilli has a villin cap but stereocilia doesn’t
- stereocilia are much longer than microvilli
- microvilli connects to the plasma membrane via myosin 1; stereocilia connects via ezrin
- microvilli found in most epithelial cells; stereocilia found in few locations
How do stereocilia develop?
- LATERAL addition of actin filaments
2. elongation of actin filaments
State 6 locations of motile cilia.
- sperm cells as flagella
- oviduct
- trachea
- bronchial tree
- olfactory
- brain ependyma (forms lining of brain and spinal cord canal)
What are the 2 main functions of motile cilia?
- transport cell secretions
2. sperm propulsion
Which type of cilia on average is the shortest?
primary/monocilia
True or false: Primary cilia is motile
false
primary cilia is immotile
How are the core microtubules arranged in motile versus primary cilia?
Motile cilia –> 9 + 2 arrangement
Primary cilia –> 9 + 0 arrangement
State the function of a basal body.
anchor cilia to apical cell cytoplasm
Another name for basal body is …
microtubule-organizing center
Define epithelium
a layer of cells (single or stratified) that lines the external surfaces of body structures and the lumen hollow organs and cavities in the body
Function of simple cuboidal epithelium.
secretion and absoprtion
True or false: the large intestine has microvilli
False. It’s the small intestine
Define mesothelium
Epithelium that lines body cavities ex: pericardum, pleural, and peritoneum cavities
Mesothelium is what type of epithelium?
simple squamous
Define epithelioid tissue
Cells that are closely packed and lack an apical surface
Where epithelioid tissue found
adrenal glands parenchyma
corpus luteum cells
interstitial cells of Leydig
Islets of langerhans in pancreas
Define parenchyma
The functional part of an organ or tissue
Myoepithelium
cells found directly beneath glandular cells above their basement membrane
ex: salivary glands, mammary glands
Serosa
a membrane composed of simple squamous epithelium covered by sparse connective tissue, lining the organs and cavities of the body
line body cavities that do not open directly to the outside
Adventitia
a layer of loose connective tissue (fibrous and/or adipose) covering the external surface of an organ, serving to hold the organ in place and bind it to adjacent tissues and organs. It has no epithelial layer and no distinct boundary
Lamina propria
a thin layer of loose areolar connective tissue, which lies beneath the epithelium and together with the epithelium and basement membrane constitutes the mucosa
