The Orion A molecular cloud, located at 415 pc and spanning some 7 degrees in the night sky, is the massive star forming region nearest to the Sun. As such, it is extensively studied in a variety of wavelengths covering the entire electromagnetic spectrum, most recently with the Herschel Space Telescope. In this talk I will present our study of the low-to-high mass pre-stellar gravitationally bound cores across the cloud, as well as their association to the underlying filamentary structure and the dependence of their properties (mass, temperature etc.) on their local density environment.