Microtubules (24-28 nm in diameter) in adult mammalian cardiac muscles are more numerous than previously recognized, forming a network associated with myofibrils and encircling the nucleus.
Sections of adult mammalian cardiac muscles fixed at room temperature reveal numerous microtubules (24--28 nm in diameter) both near the nucleus and in the extra-myofibrillar space. Microtubules encircle the nucleus, are associated with the myofibrils in a helical arrangement, and form a network that runs transversely at the level of the I band and axially between the myofibrils. Microtubules are more numerous in muscle cells than previously recognized and may perform more than cytoskeletal function.
Goldstein et al. (1979) studied mammalian heart muscle. Microtubules (24-28 nm in diameter) in adult mammalian cardiac muscles are more numerous than previously recognized, forming a network associated with myofibrils and encircling the nucleus.
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