The Branching Pattern of the Brachiocephalic Trunk in the Donkey (Equus asinus).

The research explores the branching patterns of the Brachiocephalic Trunk (BCT) in donkeys, highlighting the important differences and similarities compared to other members of the Equidae family, such as horses and the Caspian miniature horse.

Objective and Methodology

• The researchers sought to understand the branching patterns of the Brachiocephalic Trunk (BCT) in donkeys, an area previously under-studied despite the use of this animal in veterinary medicine courses.
• A detailed analysis was undertaken based on observations from seventeen mature donkeys, euthanised and examined post mortem.
• Thirteen of these specimens were embalmed and injected with coloured latex for better vessel visualization, while four were examined fresh without this procedure.

Major Findings

• The study found that in all cases, the BCT is the sole branch off the aortic arch, leading onto the left subclavian artery (LSb), right costocervical trunk, right subclavian artery (RSb) and the bicarotid trunk.
• The right subclavian artery branches into significant vessels including the costocervical trunk, vertebral artery, internal thoracic artery, and the superficial cervical artery.
• The same, barring the costocervical trunk was noted for the left subclavian artery.
• The external thoracic artery turned out to be a branch of the internal thoracic artery.

Comparative Perspective

• The primary goal of this research was not just establishing the BCT branching pattern in donkeys, but also how this information stands relative to similar data on horses and the Caspian miniature horse.
• The results led to the conclusion that while there were marked similarities and differences in the BCT branching patterns across all mentioned subgenus, some unique observations were made in the case of donkeys.

Implications

• In highlighting the branching patterns of the BCT in donkeys, these findings provide valuable insights for veterinary medicine, particularly in relation to surgical approaches or diagnostic procedures within this species.
• It also forms the foundation for tackling larger mysteries in equine evolution and genetic divergence given the common ancestry amongst horses, donkeys, and the Caspian miniature horse.