crossbridge
noun
cross·bridge
ˈkrȯs-ˌbrij 
: the globular head of a myosin molecule that projects from a myosin filament in muscle and in the sliding filament hypothesis of muscle contraction is held to attach temporarily to an adjacent actin filament and draw it into the A band of a sarcomere between the myosin filaments
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“Crossbridge.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/crossbridge. Accessed 22 Dec. 2024.
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