Respiratory System Histology (Shaw) - W2 Flashcards
1
Q
What are the components of the respiratory division?
A
- respiratory bronchioles
- alveolar ducts
- alveolar sacs
- alvoeli
2
Q
What cells are found in the non-olfactory regions of the nasal cavity?
A
- respiratory epithelium: pseudostratified ciliated columnar epithelium
- lamina propria
- glands
- lymphoid elements, plasma cells
3
Q
What cells are found in the olfactory region of the nasal cavity?
A
-
olfactory cells
- bipolar neurons w/nucleus in middle of cell
-
sustentacular cells
- columnar cells that provide physical support, nourishment and electrical insulation
-
basal cells
- pyramidal cells that do not reach epithelial surace - reservoir for replacing other cells
4
Q
What are the functions of the nasal cavity?
A
- filter by trapping in bed of mucus
- warm and humidifying
- antigen and allergen monitoring
- IgE and IgA
5
Q
where is the pharynx found and what epithelium makes it up?
A
- found from choanae to opening of larynx
- superior nasopharynx - has respiratory epithelium
- oropharynx (middle) and layrngeal pharynx (inferior) have stratified squamous epithelium
6
Q
Where is the larynx and what type of cartilages does it have?
A
- between pharynx and trachea
- cartilage
- hyaline
- elastic
7
Q
what are the two folds in the larynx?
A
- vestibular folds - superior position, immovable, pseudostratified ciliated columnar epithelium
- vocal folds - dense, regular elastic connective tissue - regulates the width of the space between the vocal folds
8
Q
What types of epithelium cover and what makes up the epiglottis?
A
- core is elastic cartilage
- superior surface has stratified squamous epithelium
- inferior surface has pseudostratified ciliated columnar epithelium
9
Q
What reinforces the trachea?
A
10-12 C shaped cartilaginous rings - made up of hyaline cartilage that is joined by smooth muscle
10
Q
What are the 3 layers of the trachea?
A
- mucosa
- respiratory epithelium
- Submucosa
- Cartilaginous
- Adventitia
11
Q
What are the cell types in the respiratory epithelium of teh trachea?
A
- ciliated columnar cells - move mucus
- goblet cells - mucus secretion
- basal cells - replenish other cells
- kulchitsky cells - replenish other cells
- brush cells - short columnar, receptors
12
Q
What are the trends as the airways go down the bronchial tree?
A
- decreasing cartilage, glands, goblet cells and height of epithelial cells
- increasing amounts of smooth muscle and elastic tissues
13
Q
How are secondary bronchi different from primary bronchi?
A
- made up of pseudostratified ciliated columnar epithelium
- C shape cartilage is replaced by irregular hyaline cartilage
- all round - no flat.
- seromucous glands and lymphoid elements are present
14
Q
What makes up larger vs smaller bronchioles?
A
- larger bronchioles - ciliated simple columnar w/occasional goblet cells
- smaller bronchioles - simple cuboidal w/occasional Clara cells
15
Q
explain the division of the bronchial tree
A
trachea –> main bronchus –> seocondary bronchus –> bronchioles –> terminal bronchioles –> respiratory bronchioles –> alveolar ducts, alveolar sacs, and alveoli
16
Q
What do Clara cells do?
A
- columnar cells - dome shaped pieces w/short microvilli
- numerous secretory granules
- protect bronchiolar epithelium
- degrade inhaled toxins via C-P450 enzymes in membranes of smooth ER
- surfactant production
17
Q
What is found in the terminal bronchioles?
A
Club (clara cells) and cuboidal cells
18
Q
What is found in the respiratory bronchioles that wasnt found in the terminal bronchioles?
A
- wall has occasional alveoli where gas can be exchanged.
- as the respiratory bronchioles get smaller, there are more alveoli
19
Q
describe the alveolar ducts
A
do not really have walls - are more linear
intraalveolar septa reinforce the alveolar ducts
20
Q
What makes up type I pneumocytes, how much surface do they cover
A
- made up of simple squamous epithelial cells
- covers about 85% of the alveolar surface
- slightly fewer in number than type II pneumocytes
21
Q
what are type II pneumocytes made of?
A
- cuboidal in shape - more dome like
- cover 5% of alveolar surface
- more numerous than type I
- lamellar bodies that contain surfactant are present
22
Q
what are the components found in surfactant
A
- dipalmitoyl phosphatidylcholine and phosphatidylglyercol
23
Q
parasympatehtic nerve supply
A
comes from vagus - causes bronchoconstriction
24
Q
A
25
**Nasal Vestibule**
support
glands
epithelium
cell types
* hyaline cartilage
* sebaceous and sweat glands
* stratified squamous keratinized
* epidermis
26
**Nasal cavity respiratory**
## Footnote
support
glands
epithelium
cell types
* support = **hyaline cartilage and bone**
* glands = seromucous glands
* epithelium = respiratory
* cell types = basal, goblet, ciliated, brish, serous
27
**Nasal cavity: olfactory**
## Footnote
support
glands
epithelium
cell types
* support = **bone**
* glands == bowmans glands
* epithelium = oflactory
* cell types = olfactory, sustenacular, basal
28
**Nasopharynx**
## Footnote
**support**
**glands**
**epithelium**
**cell types**
* support = **skeletal muslce**
* glands = seromucous glands
* epithelium = respiratory
* cell types = olfactory, sustenacular and basal
29
**Larynx**
## Footnote
support
glands
epithelium
cell types
support = hyaline and elastic cartilages
glands = mucous and seromucous glands
epithelium = respiratory and stratified squamous nonkeratnized
cell types
30
**trachea and primary bronchii**
**support**
**glands**
**epithelium**
**cell types**
support = hyaline cartilage, irregular collagenous connective tissue
glands = mucous and seromucous glands
epithelium = respiratory
cell types
31
**Secondary bronchi**
**support**
**glands**
**epithelium**
**cell types**
support = hyaline cartilage and smooth muscle
glands = seromucous glands
epithelium = respiratory
cell types
32
Primary bronchioles
## Footnote
support
glands
epithelium
cell types
support = smooth muscle
glands = no glands
epithelium = simple columnar to simple cuboidal
cell types = ciliated cells, clara cells, goblet cells
33
Terminal bronchioles
## Footnote
support
glands
epithelium
cell types
support = smooth muscle
glands = no glands
epithelium = simple cuboidal
cell types = some ciliated, Clara cells, NO GOBLET
34
RESPIRATORY BRONCHIOLES
## Footnote
support
glands
epithelium
cell types
support = smooth muscle and collagen fibers
glands = no glands
epithelium = simple cuboidal and highly attenuated simple squamous
cell types = ciliated, cuboidal cells, clara cells, pneumocytes
35
Alveolar ducts
## Footnote
support
glands
epithelium
cell types
support = type III collagen (reticular fibers) and smooth muscle sphincters of alvvoli
glands = no glands
epithelium = highly attenuated simple squamous
cell types = types I and II pneumocytes
36
Alveolar sacs
## Footnote
support
glands
epithelium
cell types
support = type III colagen and elastic fibers
glands = none
epithelium = highly attenuated simple sqamous
cell types = I and II pneumcoytes
37
Alveoli
## Footnote
support
glands
epithelium
cell types
support = type III collagen and elastic fibers
glands = none
epithelium = highly attenuated simple squamous
cell types = type I and II pneumocytes of alveoi
also have alveolar macrophages
38
What is shown below?
Respiratory olfactory epithelium
you can see pseudostratified columnar epithlium with Bowman's glands.
39
What is shown below?
* Trachea
* contains
* EL = elastic lamina
* E - pseudostratified ciliated columnar epithelium
* SM = submucosa
40
What is shown below?
**Trachea**
* **Mucosa**
* ****has elastic lamina
* psuedostratified ciliated epithelium that rests on thick basement membrane (arrows)
* Submucosa
* has many glands
*
41
What is shown below?
**Trachea epithelium**
Numerous goblet cells (G) inserted into the epithelium as unicellular glands produce a mucus that coats the ciliated epithelial surface. The intense-staining dark band (BB) at the apical ends of the ciliated cells is due to the presence of large numbers of basal bodies that are responsible for cilia formation. The epithelium sits on a thick basement membrane (BM) and adjacent to the basement membrane is the underlying lamina propria.
42
What is shown below?
**Submucosa of the trachea w/seromucous glands**
D= ducts
M=mcuous secreting cells
S = serous secreting cells
43
What is shown below?
**Bronchi**
E = pseudostratified columnar epithelium with occasional goblet cells
SM = smooth muscle found around
A = alveoli
C = c-shaped hylaine cartilage that is found
44
What is shown below?
Bronchi
45
What is shown below?
**Bronchioles**
epithelium vaires depending on large or small.
NO GLANDS OR CARTILAGE
46
What is shown below?
**TERMINAL BRONCHIOLE**
E = simple low cuboidal epithelium
Some smooth muscle persists in terminal bronchiole wall epithelium
47
What is shown below?
**Respiratory Bronchioles**
Alveoli interrupt the epitheium.
No goblet cells or smooth muscle
48
What is shown below?
Respiratory bronchioles
49
What is shown below?
**Alveolar ducts** - as indicated by astericts.
Alveoli are labled with "A".
VP = visceral pleura w/thin layer of connective tissue
50
What is shown below?
**Alveolar sacs**
51
What is shown below?
**Respiratory capillaries**
52
What is illustrated by the arrow?
**Type II pneumocytes**
53
What is shown by the arrow?
Thickening of interalveolar septum around alveoli by smooth muscle.
54
What is shown by the arrow?
**Elastic fibers**
55
What is shown and what comprises it?
**Visceral pleura**
made up of connective tissue and mesothelium
Alveoli are immediately adjacent
56
What is shown by the arrow and why is it brown?
**alveolar macrophages**
phagocytosis of red blood cells cause hemosiderin to accumulate in them.
57
What is shown? What is the arrow?
Trachea
pseudostratified columnar ciliated epithelium
58
Where was this taken and what is at the tip of the arrow?
Trachea
hyaline cartilage
59
What tissue is shown and what is shown by the arrow?
**Trachea**
seromucous gland.
