Histology of connective tissues Flashcards
What colour do collagen fibres stain?
pink
What type of connective tissue has…
Widely spaced collagen fibres
Fibroblasts/fibrocytes
unstained ground substance
Loose connective tissue
What cells can connective tissue cells be derived from?
mesenchymal cells
haematopoeitic stem cells
Osteoblasts are derived from which cell?
mesenchymal cells
Chondrocytes are derived from which cell?
mesenchymal cells
Collagen, elastin and reticulin are all examples of what type of fibre?
Visible fibres
What part of connective tissue does not stain with H&E?
ground substance
What comprises ground substance?
proteoglycans
glycosaminoglycans
invisible fibres
laminin and fibronectin are examples of what type of fibre?
invisible fibres
What are the 4 types of connective tissue?
loose fibrous
dense fibrous
hard
fatty
What type of connective tissue is cartilage?
hard connective tissue
What do fibroblasts secrete that forms collagen?
tropocollagen subunits
Where is collagen assembled?
extracellularly
Describe tropocollagen
triple helix of peptides
What type of collagen is in the skin?
type 1
What type of collagen is in the cartilage?
type 2
Type 1 collagen is found in which part of the body?
the skin
Type 2 collagen is found in which part of the body?
catilage
What type of collagen is reticulin and where is it found?
reticulin is type 3 collagen
reticulin is found in the liver, spleeen and bone marrow
what type of collagen is present in basement membranes?
type IV
In which part of the body would you find type V collagen?
placenta
Describe what the difference between loose and dense connective tissue is?
In loose connective tissue- widely spaced thin collagen fibres
In dense connective tissue- closely spaced thick collagen fibres
What subtypes of dense connective tissue are there?
irregular dense connective tissue
regular dense connective tissue
What is the difference between regular and irregular dense connective tissues?
regular- regularly arranged collagen fibres
irregular- haphazardly arranged collagen fibres
Why does reticulin require a silver stain?
It is not visible on H&E
What does reticulin form in many organs?
A supporting scaffold
What colour do elastin fibres stain of H&E?
pink
What cell produces elastin fibres?
fibroblasts
Can elastin fibres be branched?
yes
What type of adipose tissue has large cells with a single fat globule in each cell?
white adipose tissue
What colour does the fat globule usually appear on slides?
white
How does brown adipose tissue differ to white adipose tissue?
cells have multiple fat globules instead of one per cell
At what stage of life do we have lots of brown adipose tissue?
as newborns
What is the name for mature cartilage cells?
chondrocytes
What is the name for immature cartilage cells?
chondroblasts
what connective tissue is avascular?
cartilage
What type of cartlage is found in synovial joints?
hyaline cartilage
What type of cartilage is found in the epiglottis?
elastic cartilage
What type of cartilage is found in the pinna?
elastic cartilage
What type of cartilage is found at the pubic symphysis?
fibrocartilage
How many layers of synovial cells will you find lining the inside of the joint capsule?
1-4
What are the two types of synovial cell called?
type A and type B
Which type of synovial cell plays a phagocytic role?
type A
What is the function of type b synovial cells?
produce synovial fluid
Which type of endoplasmic reticulum are type B cells rich in?
rough ER
What type of muscle would you find in the walls of arteries, the wall of the intestine and the airways of the lungs?
smooth muscle
What type of muscle is the diaphagm?
skeletal
Where would you expect to find myofibroblasts and myoepithelial cells?
ducts
Describe the shape of the cells in smooth muscle?
fusiform
If a muscle does not have striations, what type of muscle is it?
smooth muscle
If a muscle has striations, what type of muscle could it be?
cardiac/skeletal
Where do you find the nucleus in cardiac myocytes?
central
Describe the positions of the nucleus in smooth muscle cells?
central
Which type of muscle has nuceli on the edge of the cell?
skeletal muscle