a lower part of the heart
By definition, apex is the lowermost and outermost portion of the heart. So it has to be inferior.
The apex of the heart is the most inferior part of the heart.
If you cut the heart so that there is a superior and inferior part the section is a transverse section.
the apex
The Apex
Inferior part of the aorta
Inferior Venacava
The upper most anterior / inferior connecting part of the Heart to the Arteries.
Inferior.
Inferior vena cava
The apex is the lowest part of the heart, and is formed by the most inferior part of the left ventricle. So to answer your question, inferiorly.
"Inferior apical" typically refers to a specific region of the heart, specifically the lower part of the apex. This area is supplied by the inferior cardiac arteries and plays a role in the overall functioning of the heart. Issues or damage in this region can affect heart function and may require medical intervention.