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 . Explanations > Brains > Parts > Midbrain. Tectum | Tegmentum | See also . The midbrain, or mesencephalon is made up of two main structures and surrounds the cerebral aqueduct. Tectum. The tectum is in the dorsal part of the midbrain. The superior colliculi are a part of the visual system and are involved in visual reflexes and reactions to moving stimuli. The inferior colliculi appear as four bumps on the dorsal surface of the brain stem and are a part of the auditory system. Tegmentum. The tegmentum sits beneath the tectum. Reticular formation The reticular formation ('little net') is a large and complex structure of over 90 nuclei that sits at the core of the brain stem.