Costal arch
That portion of the inferior aperture of the thorax formed by the articulated cartilages of the seventh to tenth (false) ribs.
Synonym: arcus costalis, arcus costarum.
Dictionary > Costal arch
You will also like...
Plant Water Regulation
Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..
The Evolutionary Development of Multicellular Organisms
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Biological Cell Introduction
It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..
Arthropods
The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..
Evolution of Life – Ancient Earth
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Adaptive Radiation
The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..