Final answer:
The medical term that refers to between the ventricles is 'interventricular'. The interventricular septum is a thicker septum that separates the left and right ventricles, and the anterior and posterior interventricular sulci are grooves on the heart's surface between the ventricles.
Step-by-step explanation:
A medical term that pertains to between the ventricles is interventricular. The interventricular septum is a key structure located between the left and right ventricles. This septum is crucial for the heart's function because it helps to maintain the separation between the left and right sides of the heart, allowing the ventricles to generate the necessary pressure for blood circulation without interference from each other. The septum is thicker than the interatrial septum, given the higher pressures the ventricles deal with during contraction, ensuring the structural integrity of the heart. Meanwhile, the atrioventricular septum is another important septum that separates the atria from the ventricles, where atrioventricular valves are located.
The heart also has distinct anatomical grooves called the posterior and anterior interventricular sulci, which are located on the posterior and anterior surfaces of the heart, respectively, between the left and right ventricles. These sulci help to delineate the boundaries between the ventricles on the surface of the heart and provide a path for blood vessels that supply the heart muscle.