The pectoralis major muscle can be divided into groups of
fibers superior, or claviclular, and inferior, or sternocostal.
<span>Pectoralis is a major muscle fundamentally responsible for
shoulder joint movements. It is divided
into four actions and two groups of fibers, anatomically the superior side and
interior side. These movements are often
used in everyday lives like throwing and flapping the arms.</span>
What are the different types of interactions in nature?he interaction among organisms within or between overlapping niches can be characterized into five types of relationships: competition, predation, commensalism, mutualism and parasitism.
