Light and scanning electron microscopic studies of the nasal turbinates of the horse.

This research investigates the structure and composition of the nasal turbinates in horses by employing light and scanning electron-microscopy. The study provides detailed insights into the epithelial layout and cellular characterization of different regions within the nasal turbinates.

Overview of Nasal Turbinates Study

• The research was conducted on the nasal turbinates of five young horses, focusing on the structure of the epithelial and cellular layout in different parts of the nasal passageway; the dorsal and ventral nasal turbinates, as well as the ethmoturbinates.
• The research includes an in-depth examination of cell types and their arrangement, and was conducted using both light and scanning electron-microscopy.

Findings at Different Parts of the Turbinates

• In the rostral part of the dorsal and ventral nasal turbinates – the area closest to the outer opening of the nose – the study found a lining of stratified cuboidal epithelium, a multi-layered cell structure consisting of cube-shaped cells. Here, the investigation also identified polyangular microvillus cells separated by linear depressions.
• The mid and caudal (rear) parts of the dorsal and ventral nasal turbinates and the forward part (rostral) of the ethmoturbinates were found to be lined by a pseudostratified columnar ciliated respiratory epithelium. This is a single layer of cells varying in shape, and is a common feature in the respiratory system.
• In this same area, the study discovered numerous cilia (hair-like structures) with dilated blebs (small inflated areas) on the ciliated cells. These structures concealed supporting cells and goblet cells, which are involved in the production and release of mucus.

Findings on the Olfactory Region

• The olfactory area comprised the olfactory vesicle and a dense network of olfactory cilia, and was found in the caudal part of the ethmoturbinates.
• The different regions – the rostral, mid, and caudal areas of the dorsal and ventral nasal turbinates and the ethmoturbinate region – were distinguished from each other by transitional zones.

Significance of the Study

• This study provides valuable insights into the structure and composition of horse nasal turbinates. Understanding these structural nuances can aid in the comprehension of respiratory health in horses and potentially guide future research and treatment strategies.