its resemblance to the Greek letter.

Angles

* The frontal angle is practically a right angle, and corresponds with the point of meeting of the sagittal and coronal sutures; this point is named the bregma; in the fetal skull and for about a year and a half after birth this region is membranous, and is called the anterior fontanelle.
* The sphenoidal angle (also Welcker's angle), thin

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