Z line

Z line

a cross-striation bisecting the I band of striated muscle myofibrils and serving as the anchoring point of actin filaments at either end of the sarcomere.

Synonym(s): intermediate disc, Z band, Z disc

Z line

n.

Any of the dark thin protein bands to which actin filaments are attached in a striated muscle fiber and that mark the boundaries of adjoining contractile units.

Z line

(līn)

A cross-striation bisecting the I band of striated muscle myofibrils and serving as the anchoring point of actin filaments at either end of the sarcomere.
Synonym(s): Z band.

Z line

The structure delimiting each end of the sarcomere in striated muscle. It gives anchorage to titin and to the outer ends of the thin filaments.