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Cartilage
- Can become calcified and eventually turns to bone.
Types
- hyaline:
- matrix contains 40% (dry weight) collagen
- Mainly type II collagen, thinner than type I
- cells (chondrocytes) in individual
lacunae
- fibres increase in diameter from lacunae into matrix
- proteoglycans
- present in high concentrations and form firm gel
- principal proteoglycans are keratan sulfate and chondroitin sulfate
- fibrocartilage
- closely resembles dense regular connective tissue
- found at insertion of ligaments and tendons and on rim of
intervertebral discs
- cell in lacunae have thin capsules
- chondrocytes in small amount of
cartilage matrix in rows between parallel collagen type I fibres
- elastic
- e.g. external ear
- more opaque and yellowish in colour
- less abundant matrix
- much of matrix is elastin fibres
- develop from areas of primitive connective tissue
| (a) Cartilage. Cells: chondroblasts, chondrocytes. Matrix
of hyaline cartilage: proteoglycan aggregates / type II collagen
(plus elastin in elastic cartilage; type I collagen in fibrocartilage). |
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