Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
32 Cards in this Set
- Front
- Back
|
what are the three components common to all CT?
|
cells
fibers ground substance |
|
|
what three groups can CT be seperated into?
|
embryonic CT
CT proper specialized CT |
|
|
what is the basic CT of the embryo?
|
mesenchyme, its pluripotential , some mesenchyme cells remain in the adult body
|
|
|
Mucous CT?
|
only found in whartons jelly of umbilical cord
|
|
|
What is loose (areolar) CT characterized by?
|
lots of ground substance
|
|
|
where is loose CT found in the eye?
|
papillary layer of dermis
iris stroma stroma of ciliary body processes ct of bulbar conjuctiva ct of palperbrarl conjuctiva |
|
|
what is characteristic of densse irregular CT?
|
little ground substance
lots of fibers not many cells good for strength in all directions |
|
|
where is dense irregular CT fround in eye?
|
reticular layer of dermis (eyelid)
sclera |
|
|
where can dense regular CT be found in eye?
|
sclera
|
|
|
what is collagen made up of?
|
bundle of collagen fibrils
|
|
|
what are collagen fibrils made up of?
|
tropocollagen, which is made up
|
|
|
where is type 1 collagen found?
|
its most abundant. found in loose and dense CT, bone and fibro cartilage
|
|
|
Where is type two collagen found?
|
in cartilage and vitreous of eye
|
|
|
what type of collagen does fibrocartilage contain?
|
mostly type 1, but 2 is also present
|
|
|
where is type 3 collagen found?
|
reticular fibers
|
|
|
where is type 4 fibro cartilage found?
|
basal laminae
|
|
|
how are reticular fibers arranged?
|
they form networks of type 3 collagen fibrils (similar to steel wool)
|
|
|
why don't reticular fibers stain with H&E
|
because they have a high carbohydrate concentraion
|
|
|
are reticular fibers branched?
|
no
|
|
|
characteristics of elastic fibers?
|
truly branched
in contracted state in lamina sometimes wavy in nature (not many things in histo are wavy) |
|
|
what is the protein that makes up elastic fibers?
|
elastin
|
|
|
why does ground substance attract water?
|
because of GAG's have negative charge and they attract water, they also have like charges so they don't like each other
|
|
|
what is the difference btween euchromatin and heterochromatin?
|
euchromatin is actice, chromatin is uncoiled, takes up more space so less electron dense, EM looks light
heterochromatin is inactive, coiled up tight. more electron dense |
|
|
what is main function of fibroblast?
|
produce and maintain extracellular matrix
|
|
|
what is significant about mast cells?
|
have huge granules in cytoplasm
|
|
|
what are mesenchymal cells?
|
fixed CT cells that are source for new cells (adult stem cells)
|
|
|
what are two organelles that are especially developed in plasma cells?
|
lots of rough ER (making antibodies)
big golgi also have cartwheel nucleus |
|
|
what should u know about white fat?
|
its unilocular
located in superficial fascia |
|
|
brown fat?
|
multilocular
mostly in newborns used for heat production |
|
|
what are the three types of collagen fibers?
|
hyaline
elastic fibrocartilage |
|
|
what is hyaline cartilage made up of?
|
type two collagen
GAGs hyaluronic acid |
|
|
what is fibrocartilage mostly made up of?
|
numerous type 1 collagen fibrils
|
