Another pictures:
Description:
Inferior medullary velum - lower part of roof of fourth ventricle. It consist of ependymal layer and pia mater which grow together into choroid membrane. In the velum are apertures wich conect ventricular space with subarachnoidal space. The pial vessels rise to the fourth ventricle as choroid plexus.
Rhomboid fossa; Floor of fourth ventricle Roof of fourth ventricle Superior medullary velum Inferior medullary velum Fastigium Choroid plexus