Equine synovial tendon sheaths and bursae: a transmission electron microscope study.

This research uses electron microscopy to study the structure and properties of synovial tendon sheath and bursal lining in horses, which are composed of fibroblastic cells mostly with poor cytoplasmic organelles and occasionally show signs of phagocytosis. The properties of these tissues are found to be similar in both young and adult animals.

Understanding the Study

• The study was carried out using a transmission electron microscope, a powerful tool that uses a beam of electrons as a light source to provide highly detailed images of cellular structures.
• The research focused on the synovial tendon sheath and bursal lining of horses, which are key components of the equine locomotor system.
• The primary purpose of the study was to understand the detailed cellular structure of these tissues, enhancing our knowledge of equine biology and potentially informing veterinary medicine and care for horses.

Key Findings

• The lining cells of these areas were revealed to be fibroblasts. Fibroblasts are a type of connective tissue cell that produce collagen and other fibres critical for tissue repair and maintenance.
• Generally, these cells had poor cytoplasmic organelles, meaning they were not highly active cells. They had sparse short profiles of rough endoplasmic reticulum (RER), few scattered ribosomes, and the Golgi complex, an important component of the cell responsible for protein processing and transport, was poorly developed.
• Some cells, however, appeared to be more active, with pronounced RER with dilated cisternane (a term referring to the interior space of the RER), and showed filipodia of different shapes on their surfaces. Filipodia are slender cytoplasmic projections that extend from the cell body, and their presence may suggest these cells are capable of phagocytosis, the process by which a cell engulfs material for ingestion and disposal.
• In young animals, the structures were more or less akin to those of the adults, suggesting there is little developmental change in these tissues as the horse ages.
• The lining cells were virtually indistinguishable from the fibroblasts in the subconnective tissue, indicating a significant similarity between these cellular components in horses.