3 - Connective Tissues Flashcards
Three embryological germ layers
Ectoderm, endoderm,
mesoderm
Germ layers from which epithelium develops from
All germ layers
Germ layers that connective tissue develops from
Mesenchymal stem cells from mesoderm
Common layout of connective tissue
Few cells to a large mass of extracellular matrix which consists of fibres embedded in ground substance containing tissue fluid: extracellular fluid
Dominant component that determines type of connective tissue
Extracellular matrix
Cell that produces most fibres in the body (EG: collagen, elastin)
Fibroblasts
Molecular makeup of collagen
3x alpha polypeptide chains that form a helix.
Type I collagen
Connective tissue proper, bone, tendon, ligament
Type II collagen
Hyaline cartilage, intervertebral disc
Type III collagen
Reticular collagen.
Forms framework in certain tissues (EG: liver, bone marrow)
Type IV collagen
Forms basement membrane
Type VII collagen
Anchoring fibrils that link to basement membranes
How are type III collagen fibres stained?
Not with H&E.
With silver stains
Shape of elastin fibres
Branching fibres or sheets
Where is elastin most commonly found?
Lung, skin, aorta