z-linehttp://www.oed.com/dictionary/z-line_n%3Ftab%3Dmeaning_and_useZ line, n.
First published 1986; not fully revised

Z linenoun

Histology.
  1. 1916–
    A transverse dark line in a fibril of striated muscle formed by Krause's membrane (see Krause n. b); the membrane itself.
    1. 1916
      This stripe or accessory disk..bisects the portion of the J disk between the Z line and the succeeding Q disk.
      Jordan & Ferguson, Text-book of Histology iv. 105
    2. 1954
      The series elastic component is provided either by the actin filaments themselves, or, more probably, by their mode of attachment to the Z-line.
      Nature 22 May 976/1
    3. 1979
      In muscle fibers the actin filaments are anchored to flat protein structures called Z lines, which are emplaced between every two contractile units.
      Scientific American May 94/2

Z line, n. was first published in 1986; not fully revised.

Z line, n. was last modified in July 2023.