muscle scarn.Palaeontology a mark on a shell, bone, etc., indicating a point of attachment of a muscle.
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1889 Amer. Naturalist23 985 The central muscle scars [in the brachiopod genus Obolella] diverge posteriorly.
1974 D. Webster & M. WebsterCompar. Vertebr. Morphol. vii. 141 Faint ‘muscle scars’ on these fossil bones indicate some of the points of muscle attachment.