The upper cannon is a crucial part of the skeletal system in many animals, including horses and cows. This bone extends from the knee to the hock and is responsible for the movement and support of the leg. Synonyms for the upper cannon include long bone and metacarpal bone. It is important to note that different animals have different names for this bone. For example, in horses, it is referred to as the metacarpus, and in cows, it is called the metatarsus. Regardless of the name, the upper cannon is an essential component of animal anatomy, providing necessary support and mobility to ensure proper movement and overall health.