= Cardiac apex
The \b[cardiac apex] is the pointed inferior end of the <heart>, formed mainly by the <left ventricle>. It lies toward the patient's left and supplies a useful endpoint for describing the <cardiac long axis>. The <anterior interventricular sulcus> and <posterior interventricular sulcus> approach this region along the ventricular surface.<Anatomy and Physiology 2e by J. Gordon Betts and others>[§19.1, External Anatomy, Figure 19.6]{ref}
The <cardiac apex> is an anatomical landmark, not a fifth chamber or an opening through which <blood> leaves. <Blood flow> from the <left ventricle> passes through the <aortic valve>; a pointed chamber outline does not indicate the outlet. This distinction is helpful when translating a simplified heart-shaped drawing into actual chamber connections.
A concrete orientation exercise begins with an anterior view of a specimen: identify the <cardiac apex>, follow the <anterior interventricular sulcus> away from it, then locate the <coronary sulcus>. These landmarks relate the ventricular tip, ventricular boundary and atrial–ventricular boundary. Right and left refer to the patient's anatomy, so a frontal illustration viewed face-on reverses them relative to the viewer.
The distinction between a landmark and a measurement also matters for the <apical impulse>. A motion detected at the chest surface is an observation of transmitted movement, whereas the <cardiac apex> is a location on the <heart>. Similarly, an <echocardiography> image needs an identified viewing direction: distance from an image edge is not an anatomical definition of the apex. A shared anatomical reference makes different views comparable.
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