Incision into a heart ventricle
The correct spelling of the brain surgery is "ventriculotomy".
encephelotomy
Thoracotomy means surgical incision of the chest or thorax. A incision into the chest is done with two different methods. A incision into the front of the chest is known as a Median Sternotomy. This is usually the incision used for cardiac bypass, valve replacement, etc. A incision into the side of the chest is known as a Thoracotomy.