Skip to main content
. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Anat Rec (Hoboken). 2014 Sep;297(9):1637–1649. doi: 10.1002/ar.22980

Figure 1.

Figure 1

Representation of a simplified sarcomeric unit. Muscle fibers contain myofibrils with repeating sarcomeric units, the boundaries of which are defined by the Z-disk. The actin thin filaments are bound to the Z-disk and extend toward the middle of the sarcomere where they interact with the myosin motor domains of the thick filament. The I-bands are the region composed only of thin filaments whereas the A-band includes the region where the thick filaments interact with the thin filaments.