The elastic cartilage in the normal rat epiglottis. I. Fine structure

Area of Science:

• Cell Biology
• Histology
• Biochemistry

Background:

• Chondrocytes in the rat epiglottis exhibit unique characteristics.
• Lipid and glycogen content may relate to cellular function.
• Ruthenium red staining highlights vacuolar membranes.

Purpose of the Study:

• To investigate the ultrastructure of rat epiglottis chondrocytes.
• To characterize the intercellular substance and matrix components.
• To explore potential functional implications of observed cellular features.

Main Methods:

• Transmission electron microscopy was employed.
• Ruthenium red staining was used to visualize specific structures.
• Detailed ultrastructural analysis of chondrocytes and extracellular matrix was performed.

Main Results:

• Chondrocytes contain significant glycogen and lipid droplets, resembling adipocytes.
• Cells possess long cytoplasmic processes.
• Intercellular substance includes proteoglycan granules and striated fibers.
• Elastic fibers composed of amorphous and microfibrillar parts are present.
• Lysosome-like granules and vesicles observed in the matrix.
• Accumulations of particulate and amorphous material found in outer lacunae, possibly related to fiber development.

Conclusions:

• Rat epiglottis chondrocytes possess distinct ultrastructural features.
• The observed lipid and glycogen content likely plays a functional role.
• The extracellular matrix contains characteristic components of cartilage, alongside elastic fibers.
• Specific matrix accumulations may be involved in collagenous and elastic fiber formation.