👉 Interfribrillar is a medical concept, which refers to the disruption of the electrical and nerve signals within a brain region. This can occur due to various conditions such as strokes or brain tumors, where there is a blockage in the pathway leading from the brain to the spinal cord. Inferior interventricular septal defect (IISD) is a condition that occurs when the inferior part of the brainstem does not fully separate from the superior part. This can cause severe problems