In the archetype pattern ( A ), the media forks into two main branches : a media anterior ( MA ), which divides into two distal branches ( MA1, MA2 ), and a median sector, or media posterior ( MP ), which has four terminal branches ( M1, M2, M3, M4 ).
2.
In the archetype pattern ( A ), the media forks into two main branches, a media anterior ( MA ), which divides into two distal branches ( MA1, MA2 ), and a median sector, or media posterior ( MP ), which has four terminal branches ( M1, M2, M3, M4 ).