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
Midbrain (mesencephalon). contains various nuclei and bundles of ascending & descending nerve fibers. Includes 2 pair of colliculi (sensory nuclei)in the corpora quadrigemina. - Superior colliculi (visual reflex centers) control the reflex movement of the eyes, head, neck, and response to visual stimuli. -Inferior colliculi (auditory reflex centers) control the reflex movement of the head, neck, and trunk in response to auditory stimuli.