Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.
|
TIE See also:SKULL FROM ABOVE (norma verticalis) . When looked at from above the frontal See also:bone is seen forming the anterior See also:part of the vertex and articulating with the two parietals posteriorly by a nearly transverse serrated suture (coronal suture) . See also:Running back from the See also:middle of this is the median sagittal suture extending as far as the lambda on the norma occipitalis . The point where the sagittal and coronal sutures join is the bregma, the site of the See also:lozenge-shaped anterior fontanelle in the See also:infant's See also:skull, but this closes during the second See also:year of See also:life . Small ossicles called Wormian bones are often found in the See also:cranial sutures, and one of these (the interfrontal or os See also:anti-epilepticum) is sometimes found at the bregma . About two-thirds of the way back the sagittal suture becomes less serrated and on each See also:side of it the, small parietal foramen may be seen . This only transmits a small emissary vein (see See also:VEINS) in the adult, but, as will be seen later, is of considerable morphological See also:interest . As middle life is reached the cranial sutures tend to become obliterated and the bones can no longer be separated; this See also:fusion begins at the places where the sutures are least deeply serrated, and as a See also:rule the sagittal suture disappears between the two parietal foramina between See also:thirty and See also:forty years of See also:age . |
|
|
[back] TIDORE |
[next] JOHANN LUDWIG TIECK |
There are no comments yet for this article.
Do not copy, download, transfer, or otherwise replicate the site content in whole or in part.
Links to articles and home page are encouraged.