serratus posterior inferior: a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached
posterior serratus muscle: skeletal muscle that draws the rib cage backward and downward
el nino southern oscillation: a more intense El Nino that occurs every few years when the welling up of cold nutrient-rich water does not occur; kills plankton and fish and affects weather patterns