The Thorax.  — The thorax derives its name from the Greek word thoreo, and signifies “I leap,” because the heart leaps in it.  It is covered on the front part by large muscles; the pectoralis major, or large muscle of the breast, is observed on the left side of the chest, Wilson on the right it is removed and exposes the pectoralis minor, or small muscle of the breast.  The dovetailed muscle observed on each side is the Seratus Magnus, and is employed in expanding and contracting the chest in the act of breathing.  The muscles of the chest walls, in a deep inspiration, exert a force equal to lifting a weight of 750 pounds.

I do not know Greek but I found it interesting to learn that little bit of Greek above about the thorax.  It’s a very descriptive word actually and I suspect if I understand it correctly preferring to the movement of the Adam’s apple?  I would use the word Adam’s apple is a form of layman term, and I’m somewhat surprised that they didn’t use a layman term in their description as the audience for this book is supposed to be house wives and mothers.