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The beginnings of a sagittal crest may be evident in advanced cases of muscle development.
One aging trend in porcupines is the advancement medially of the marginal muscle scars of the temporalis, and the formation of a sagittal crest if the two lateral muscle masses meet along the frontal suture.
Asymmetry of the sagittal crest is well illustrated in the figures of Hall (1981:851--drawing) and Jackson (1961:271--photograph).