It shows some names used for directions of the galaxy.
Coreward refers the direction of the galactic core, the centre of the galactic coordinate system. Coreward is always mapped at the top of a galactic map.
Rimward is the opposite direction from Coreward, referring to the direction away from the Galactic Core, towards the galactic rim. It is always mapped at the bottom of a galactic map.
Spinward refers to the direction of the Galactic Spin, i.e. the direction the galaxy is rotating to. On star maps, Spinward is mapped on the left hand side of the map.
Trailing, the final of the four galactic directions, refers to the direction against the Galactic Spin, i.e. the direction contrary to the galaxy's movement around its own axis. Trailing is usually mapped on the right hand side of the map.
Are these names original to Star Trek or were they sourced from any other work? Are they used by real astronomers?