Here is a diagram. The two different structural domains are responsible for different functions, as is revealed by treatment of myosin with proteases to give different subunits. It does not aggregate to form filaments, but it hydrolyzes ATP and binds to thin filaments. To achieve this rendition, colour the molecule by 'chain' and select 'spacefill' from the menu. Myosin is therefore unusual in that it is both a fibrous protein, and a globular enzyme.
Thick filaments consist almost entirely of myosin.
A myosin filament contains several hundred myosin molecules in two bundles packed end to end. In each bundle, the myosin molecules all point in the same direction, giving an aggregation of the myosin tails with the globular heads protruding in a regular helical arrangement. Here is a diagram.