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ro·ta·tor 'rō-.tāt-əralso rō-' n, pl rotators or ro·ta·to·res .rōt-ə-'tōr-ēz a muscle that partially rotates a part on its axis specif any of several small muscles in the dorsal region of the spine arising from the upper and back part of a transverse process and inserted into the lamina of the vertebra above
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n.
a muscle that brings about rotation of a part. The rotatores are small muscles situated deep in the back between adjacent vertebrae. They help to extend and rotate the vertebrae.
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ro·ta·tor (roґta-tər) 1. causing rotation. 2. a muscle that rotates a body part; see musculi rotatores.Medical dictionary. 2011.