An attempt is made to explain some peculiarities of the local spiral structure and large-scale distribution of HII regions in the Galaxy by coexistence of the trailing and leading arm systems of different power and development. The existence of opposite-directed arms and inter-arm links in the circular zone (5-15 kpc) is analysed from the point of view of different Galaxy models.
Dolidze, M V 
- AN Gruzinskoj SSR, Abastumani. Abastumanskaya Astrofizicheskaya Observatoriya