When performing a precaval blood collection from a pig on the right side, which structure must be avoided?

In the context of performing a precaval blood collection from a pig on the right side, it is important to avoid the left phrenic nerve. The phrenic nerve is responsible for innervating the diaphragm, and injury to this nerve can lead to complications such as paralysis of the diaphragm, resulting in respiratory problems.

When performing this procedure, the anatomical relationships of the structures within the thoracic cavity must be considered. The left phrenic nerve is located more towards the left side and would be at risk during a procedure that involves the right side of the body. Muscles, nerves, and vascular structures are all positioned in relation to one another, making it crucial for veterinary professionals to have a thorough understanding of these anatomical landmarks to prevent any inadvertent damage.

The other structures mentioned, while important in their own right, do not pose a similar risk in the context of this specific procedure when approaching from the right side. Understanding the anatomy and the location of nerve pathways contributes to effectively and safely performing blood collection in pigs.