collagen types

Type I
– major collagen type, fibrous, ranging from loose to dense, found in tissues varying from skin, to tendon, to bone

Type III
– “reticular fibers” – delicate, branching fiber forming a supportive scaffold for various organ structures

Type IV
– mesh-like, sheet-forming type of collagen found in the basement membranes of various epithelia

Type V
– form of collagen important in organizing connective tissues, found in placental, fetal, and interstitial tissue