M line


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Related to M line: H band, Z disk, Z disc

M line

a fine line in the center of the A band of the sarcomere of striated muscle myofibrils.
Synonym(s): M band, mesophragma

M line

(līn)
A fine line in the center of the A band of the sarcomere of striated muscle myofibrils.
Synonym(s): M band.

M line

In high power micrographs of striated muscle, the thin, dark line in the center of the H band of a sarcomere. It contains myomesin (a protein that connects thick (myosin) filaments), C protein, and creatinine kinase.
Synonym: M band; M disk
See also: line

M line

a histological structure in myofibrils in skeletal muscle. The line runs transversely to the length of the myofibrils and corresponds to the segment occupied by myosin myofilaments.