Fontanelles

The bone of the Skull of an infant at birth not completely ossified the space between the Bona field in bye membrane and at the angles of the bones these membranes are called Fontanelles the largest of these is situated at the junction of the frontal and the to parietal bone where are the coral sagittal structure meet this is called the interior Fontanelles it is Diamond shape major about force from back to font and forms a soft spot on the head of an infant through which the brain can be felt pulsating this Fontanelle normally closed at the age of 18 months.
The posterior Fontanelle lies at the back at the junction of the two who created and the fetal bone close soon after birth