Nine meridians and four parallels subdivide the centrosome surface into 45 small areas (scaffolds for oriented γ-TuRC, which include SAS-4/CPAP, CNN, Asl and Pericentrin), each oriented in correspondence to its position: their inclination is the result of the addition of two inclinations, one imposed by the MC (longitude) and the other by the DC (latitude). As on a globe, longitude covers the entire circumference (2π; 9 different meridians or 9 different meridian 40° wedges) while latitude covers (symmetrically) only half circumference (π; 2 caps and 3 parallel discs). (From: M. Regolini Centrosome: a geometrical model Lambert Academic Publishing Germany 2014)
