Note 780 — ON INJURIES OF THE HEAD.
Francis Adams translation
Perhaps this alludes to the form of the head in which the sagittal suture passes through the middle of the os frontis down to the nose, in which case we may imagine that the coronal suture intersects the lambdoidal in such a manner as to have some resemblance to the letter χ. It is to be borne in mind, that the character of this letter was very variable in ancient writing. Ruffus Ephesius describes the sagittal suture as sometimes passing down the middle of the frontal bone.