One of the membranous intervals between the incompleted angles of the parietal and neighboring bones of a fetal or young skull; so called because it exhibits a rhythmical pulsation
or fontanelle One of six soft spots at the junctions (sutures) of the cranial bones in an infant's skull, covered with tough, fibrous membrane. They allow molding of the head during birth. Some close by three months, others after a year, and still others by two years
the irregularly shaped area on either side of the cranium where the frontal bone and the anterior tip of the parietal bone and the temporal bone and the greater wing of the sphenoid bone meet; corresponds to the pterion when bones have ossified