Ventricular tachycardia. Ventricular tachycardia (V-tach or VT) is a type of regular and fast heart rate that arises from improper electrical activity in the ventricles of the heart. Although a few seconds may not result in problems, longer periods are dangerous. Short periods may occur without symptoms or present with lightheadedness, palpitations, or chest pain.
The midbrain tegmentum contains thousands of neurons that are responsible for a variety of many functions, two of which include the control of movement and sensory systems. See also
MedlinePlus Dictionary defines tegmentum as the part of the ventral midbrain above the substantia nigra formed of longitudinal white fibers with arched transverse fibers and gray matter. The term ventral refers to the part of the tegmentum located toward the front of the human body rather than the rear. If you look carefully at the image below, you can see two blackish areas, mirror images of each other, in the area labeled 3. These are the substantia nigrae.