1 Gray matter located on the surface of the brain is called cortex (e.g., cortex of the cerebral hemispheres, cortex of the cerebellum). 2  Masses of gray matter located deeper in the brain are called nuclei .(e.g., brainstem nuclei, nuclei of the thalamus).yramidal cells are the efferent (long-axon) cells of the cerebral cortex. The name refers to the shape of the cell body as seen in standard sections perpendicular to the cortical surface. The apex of the pyramid points toward the cortical surface.
Panic attacks are periods of intense fear or apprehension of sudden onset accompanied by at least four or more bodily or cognitive symptoms (such as heart palpitations, dizziness, shortness of breath, or feelings of unreality) and of variable duration from minutes to hours.anic attacks are periods of intense fear or apprehension of sudden onset accompanied by at least four or more bodily or cognitive symptoms (such as heart palpitations, dizziness, shortness of breath, or feelings of unreality) and of variable duration from minutes to hours.
Panic attacks typically last for less than 20 minutes. They start suddenly, sometimes for no obvious reason, sometimes in response to a stressful event, and sometimes as a result of exposure to a situation that has triggered previous panic attacks.udden onset of extreme anxiety, pounding heart, dizzyness, trouble breathing, apprehension, and a sense of doom or lack of ability to escape are signs of a panic attack. Peak anxiety usually occurs around 10 minutes after the start of the attack. However, in some rare cases a panic attack can go on for hours.