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Schematic drawing illustrating the structural features of muscles that originate on the vertebral column and insert on the skull. (a) The line drawing of splenius (SP) shows its triangular appearance. Two tendinous inscriptions, which run perpendicular to the fascicle's direction, extend to about half the muscle's thickness (arrows). (b) The line drawing of longissimus capitis (LC) shows the tendinous inscriptions (arrows) which divide LC into three parts.
