Z line

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Z line

A dark thin protein band to which actin filaments are attached in a striated muscle fiber, marking the boundaries between adjacent sarcomeres. Also called Z band.

Z line,

a narrow, darkly staining cross-striation that bisects the I band of skeletal muscles. The distance between Z lines is the length of the sarcomere. Also called intermediate disk, Z band, Z disk. See also I band, sarcomere.

Z band, Z line

a band of electrodense, noncontractile protein which runs across the muscle fiber and to which the myofibrils are attached.

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