1. Apical (A1) (Fig 2a,d,e) -- Go superiorly within the TA to a superiorly oriented branch -> A1a, A1b; also look for a posteriorly oriented recurrent artery from the truncus anterior -> A2a

2. Anterior (A3) (Fig 2b,c,d,e) -- Go back to the TA and find an anteriorly oriented branch -> A3a, A3b

3. Posterior (A2 ) (Fig 2c,d,e) -- Go back to the right pulmonary artery (RPA) and proceed just caudal to the TA, and look for the superiorly oriented ascending artery -> A2b and possibly A2a