cranial synchondrosis
cranial synchondrosis
"The cartilaginous joints of the skull; these include sphenoethmoidal synchondrosis, sphenooccipital synchondrosis, sphenopetrosal synchondrosis, petrooccipital synchondrosis, anterior intraoccipital synchondrosis and posterior intraoccipital synchondrosis."