cranial fontanelles occur in a newborn baby because Question 20 options: the cartilage in the gap between growing bones of the skull roof have not ossified by appositional growth the cartilage in the gap between growing bones of the skull roof have not ossified by endochondral growth the dense connective tissue in the gap between growing bones of the skull roof have not ossified by appositional growth the cartilage in the gap between growing bones of the skull roof have not ossified by interstitial growth the dense connective tissue in the gap between growing bones of the skull roof have not ossified by interstitial growth