What is the name for the upper border of the heart?

The upper border of the heart is referred to as the base of the heart. This area is located at the top of the heart and serves as the point where the major blood vessels such as the aorta and pulmonary veins connect. The base is essential for the heart's function, as it provides the structural foundation for the vessels that carry blood to and from the heart.

In contrast, the apex of the heart, which is another anatomical term, refers to the pointed, lower tip of the heart. The heart's orientation places the apex pointing downwards and slightly to the left, which is crucial for its pumping action and blood flow dynamics. The mention of "tip of the heart" and "heart rim" doesn't align with the accepted anatomical terminology and can lead to confusion about the heart's structure. Thus, the correct designation for the upper border of the heart is indeed the base.