Layers Flashcards
What three layers make up the mucosa of the gut? (Going outside in)
Muscularis mucosae
Lamina propria
Epithelium (most often simple columnar)
Which is the layer (in serous membranes) which is adjacent to the organ?
Visceral
Remember the Latin for organ=viscera
Which layer (of serous membranes) is away from the organ, nearest the outside?
Parietal
What is the function of serous membranes lining cavities?
Keep the organ in place
Reduce friction
Which epithelia are present in serous membranes?
What do they do?
Simple squamous
Serous fluid
How many layers make up a serous membrane?
What are they?
Two
Simple squamous epithelium (mesothelium)
Connective tissue
Name three serous membranes and where they are
Pericardial sac (surrounds heart)
Pleura (of lungs)
Peritoneum (gut)
Name the two types of cells present in alveoli
Type I- simple squamous epithelium
Type II- cell that secretes surfactant
What is the role of surfactant in the alveoli?
Reduce surface tension
Prevents the collapse of the alveoli on expiration of air
In general, how many layers does mucosa have? What are they?
Two-
Epithelium
Lamina propria (connective tissue)
How many layers are there in GI mucosa? What are they?
3
Epithelium
Lamina propria
Muscularis mucosae
What type of cartilage is present in the trachea/bronchus?
Hyaline
In the GI tract (excluding stomach), how many layers of muscle are there?
What are they called?
2
Inner circular layer
Outer longitudinal layer
What is the sub-mucosa of the GI?
What is in it?
Loose, irregular connective tissue
Glands, nerves, BV’s
What epithelium is present in the bladder wall and urethra?
Name a characteristic of this layer.
Transitional epithelium
Thick to prevent damage from the urine pH
