Another pictures:
Description:
Obex - small bridge at lower end fourth ventricle.
Inferior cerebellar peduncle Middle cerebellar peduncle Superior cerebellar peduncle Median sulcus Medial eminence Sulcus limitans Facial colliculus Locus caeruleus Hypoglossal trigone Vagal trigone Vestibular area Medullary stria of fourth ventricle Funiculus separans Area postrema Lateral recess Superior medullary velum Obex