Histological and morphometrical studies on the mucosa of the equine guttural pouch (auditory tube diverticulum).

This research paper sought to understand the structure of the guttural pouch mucosa in horses and assess its ability to clear foreign substances. Specimens were taken from numerous regions, and analyzed using light and electron microscopy, and various measurements. Results revealed some significant differences in certain areas, suggesting that the pouch’s ability to clear foreign substances can vary.

Methodology

• The researchers collected specimens from nine different regions in equines. Eight of these regions were within the guttural pouch mucosa, while one was within the nasopharynx mucosa.
• The collected samples were first subjected to light and electron microscopy for examination.
• Then, several measurements were taken, including the frequency of goblet cells per every 200 epithelial cells, the length of the cilia, and the thickness of both the epithelial cell layer and the lamina propria.

Findings

• The guttural pouch mucosa was made up of stratified columnar epithelia that had brush-like cilia.
• The researchers found no significant histological differences between the adult horses and the younger ones (foals).
• Statistical analysis revealed significant differences when it came to the frequency of goblet cells (p < 0.001) and the thickness of the lamina propria (p < 0.05).
• However, the researchers found no statistically significant difference in the length of the cilia or the thickness of the epithelial cell layer.

Implications

• The results of this research suggest that the guttural pouch mucosa has the capacity to clear out foreign substances from the body of horses. This implies that the pouch could play a crucial role in the immune response of horses against invading foreign bodies.
• However, the variations observed in the goblet cell frequency and the thickness of the lamina propria across different regions suggest that this clearance ability may not be uniform but can vary between different regions of the guttural pouch epithelium.