 The NeuroPEN was then introduced through the midline of the floor of the third ventricle anterior to the mamillary bodies in front of the basilar artery and then was gently enlarged using NeuroPEN __________  various motions. 
The NeuroPEN was then introduced through the midline of the floor of the third ventricle anterior to the mamillary bodies in front of the basilar artery and then was gently enlarged using NeuroPEN _ _ _ _ _ _ _ _ _ _ various motions .