histology- organography

a collection of tissues joined in a structural anatomical unit to perform a specific function or group of functions

define organ

the scientific description of the organs of plants and animals, and of their structure and function

what is organography?

systems

tissues and organs make up functional _______

parenchymal and tubular

what are the 2 types of organs?

solid

composed of stroma and parenchyma

what is the structure of a parenchymal organ?

the structural component, made of connective tissue

what is the stroma of a parenchymal organ?

parenchymal

which type of organ has no lumen?

liver

kidney

brain

etc

give examples of parenchymal organs

tubular

the trachea is a ______ organ

the parenchyma

what is the functional component of a parenchymal organ?

capsules, trabeculae, and lobules

the stroma of a parenchymal organ is organized into ....

the part of the stroma that externally covers the entire organ

what is the capsule?

the part of the stroma that divides portions of the organ

what are trabeculae?

lobules

what are the smallest divisions made by the stroma called?

acini- clusters

cords- lines

nodules- circles

what are the 3 ways that parenchyma can be organized? describe them.

the liver

what organ's parenchyma is organized into cords?

hepatocytes

what is the parenchyma of the liver?

the capsule

part of the stroma

what is this external CT called? what component of the parenchymal organ is it?

trabeculae

what part of the stroma is this CT?

capsule

what is this stroma?

nodules (circles)

this part of the parenchyma is organized into_____ (nodules, acini, or cords)

cords

how is this parenchyma organized- acini, nodules, or cords?

liver of a swine

this is the ______ (organ) of a _______ (animal)

they have a central cavity (lumen)

what is the main characteristic of tubular organs?

concentrical layers

tubular organs have ______ surrounding the lumen

1. mucosa

2. submucosa

3. muscularis

4. serosa

what are the 4 general layers surrounding the lumen of a tubular organ, from interior to exterior?

epithelium

lamina propria

muscularis mucosae

what does the mucosa of a tubular organ contain?

connective tissue

what makes up the lamina propria?

smooth muscle

what type of muscle is the muscularis mucosae?

epithelium

what part of the mucosa is directly in contact with the lumen?

tubular

tubular or parenchymal?

parenchymal

tubular or parenchymal?

connective tissue

fat

small blood vessels

nerves

sometimes glands and lymphoid organs

what components would you find in the submucosa?

smooth muscle

the muscularis is made up of _______

serosa

which is the most external layer of a tubular organ?

to prevent organs from sticking together and to cavity walls

what is the function of the serosa?

simple squamous epithelium

what makes up the external part of the serosa?

serosa

what is layer 1?

2

where is the muscularis?

smooth muscle

what is 2 made up of?

adventitia

what is 3?

a layer of connective tissue that covers the organ, external to the serosa, does not contain epithelium

what is the adventitia?

connective tissue

what is 3 made up of?

4

where is the submucosa?

connective tissue, vessels, nerves, glands, lymphoid organs

what is 4 made out of?

the mucosa

what is 5?

epithelium, lamina propria, muscularis mucosae

what is layer 5 made out of?

no, depending on the organ, a layer might dominate over the others

do all tubular organs have the same proportions of the four layers?

muscularis

in the intestine, which of the 4 tubular layers dominates (is thicker)?

1

which is the lumen?

lamina propria

what is layer 2?

CT

what components can you identify in layer 2?

submucosa

what is layer 3?

4

where is the muscularis layer?

small blood vessels of the submucosa

what is 1?

a gland of the submucosa

what is the structure at 2?

fat of the submucosa

what is 3?

epithelium of the mucosa

4 is...

lamina propria of mucosa

what is 5?

6

where is the muscularis mucosae?

1, 2, 3

what numbers are included in the submucosa?

4, 5, 6

what numbers belong to the mucosa?

submucosa

what is this layer?

loose CT

what type of connective tissue makes up the submucosa?

2-3

how many layers of smooth muscle make up the muscularis?

connective tissue, simple squamous epithelium

the serosa is made up of ______, and covered by ______

muscularis

what layer does the green arrow point to?

trachea

esophagus

heart

stomach

intestines

uterus

etc

give examples of tubular organs