sacromere thin filaments vs. actin

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Actin is the globular protein that makes up the microfilaments. Thin filaments are made up of actin as well. Mysoin is a thick filament but not composed of actin. It is part of its own protein family.
 
Actin is the globular protein that makes up the microfilaments. Thin filaments made up of actin as well. Mysoin is a thick filament but not composed of actin. It is part of its own protein family.

I understand that myosin and actin are two separate things. I always thought within the sacromere picture with the different bands, actin is counted as the sacromere thin filament and myosin is the thick filament. no?
upload_2016-8-29_10-44-27.png
(actin=blue, myosin=red)
 
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