When the cranial part of the neural tube is closed to the brain there are three pairs of ganglions; that is trigeminal, acousticofacial and vago-glossopharyngeal. The trigeminal ganglion is the largest, the vago-glossopharyngeal the smallest.In the earliest author's embryos which belong to the Streeter's horizon XIV, the three nerves of the trigeminus are protruding thick and straight from the ganglion toward respective regions. The portio minor of the mandibular nerve is becoming eminent in this period. Asregarding the facial nerve the chorda tympani is earlier developing than the stem in the same horizon, the N. petrosus superficialis major a little later in the next horizon XV, when the stem is almost the same as in the earlier stage.In the horizon XIV the vagus is also already well developed, its root and trunk ganglions are completely separated by nerve fiber bundle, from the trunk ganglion the upper laryngeal nerve is protruding while the stem is not yet elongating, as in the case of the chorda tympani to the facial nerve stem. The glossopharyneal nerve is a little later developing than the vagus, its root and trunk ganglions are not completely separated in the early stage, the tympanic nerve from the trunk ganglion is only in the horizon XVI to be observed.The peripheral nerve bundles which come from the epithelium of the otic vesicle and reach the statoacoustic ganglion are developing from the horizon XV to XVI and in the horizon XVII all nerves already discernible.Among the motor nerves the hypoglossal is the first developing, it reaches to the level of the trunk ganglion of the vagus in the early horizon XIV, while the others for the optic bulb muscles : the oculomotorius, trochlearis and abducens are not yet protruding from the brain wall. Among these three nerves the oculomotor is the earliest developing, the trochleal the latest. The former is in the horizon XV, the latter in the next horizon XVI protruding from the brain wall.