What are the similarities and differences between hyaline cartilage and elastic cartilage?
Both hyaline and elastic cartilages are made of special cells called chondroblasts (called chondrocytes when cells become old). These cells secrete extracellular matrix: which is made of collagen and peptidoglycan.
Both hyaline and elastic cartilagenous tissues are surrounded by perichondrium, a layer of fibroblasts.
- Hyaline cartilage appears translucent, grey in colour due to presence of lots of collagen. Such cartilages are present in articular sufaces of long bones, tracheal rings, nasal septum, etc.
- Compared to this, extracellular matrix of elastic cartilage is laden with lots of elastin fibres. Such cartilages provide flexibility in structures like tip of nose, ear pinna, etc.