Relation of the vestibular ganglion to the otocyst and cochlear ganglion in human embryos during 5th and 6th week of development.

Human embryos during developmental stages 14-17 were investigated. At stage 14 the endolymphatic appendage is already developed. The vestibulocochlear and geniculate ganglia form common ganglionic complex surrounded by mesenchymal capsule. At this stage three components may be distinguished. The differentiation of the ganglia appears in the following sequence: geniculate, vestibular, cochlear. The geniculate ganglion is rostroventral and the vestibular dorsomedial in position.