An explanation of a groove found on the nasal process of the equine incisive bone.

This study focuses on understanding the cause of a common groove found on the nasal structure of horses, concluding that it’s likely due to the action of certain nasal muscles and cartilage.

Background and Objective

The research aims to investigate the cause of a certain groove that is frequently found on the nasal bone of horses. Specifically, the groove appears on the dorsal border and medial side of the nasal process of the incisive bone. Given that this groove is not rare but rather common, appearing on both sides in 40 out of 44 equine skulls analyzed, it was necessary to scientifically explore what could be causing it.

Methodology

• The study conducted dissections on thirteen fresh equine (horse) heads to investigate the formation of these grooves.
• The researchers carefully studied and documented the anatomy of the nasal process of the incisive bone in these specimens to identify any patterns or specific factors that could explain the presence of these grooves.

Findings

The researchers concluded that these grooves, or sulci, seem to be the result of the combined action of two specific anatomical structures:

• The lateralis nasi muscle, which is one of the muscles involved in the outer part of the nasal structure of equines.
• The medial accessory cartilage of the nose, scientifically referred to as the cartilago nasalis accessoria medialis.

Thus, it is the interaction of these two structures that likely causes the grooves in the nasal process of the incisive bone.

Other Observations

Additionally, the researchers also noticed other sulci or grooves on the nasal process of the incisive bone in the equines. They proposed that these cases may be explained by impressions caused by nerves. However, this second set of observations likely needs further investigation to ensure that this plausible explanation is, in fact, the cause.