Brain tumor surgery is limited by the risk of postoperative neurological deficits. Intraoperative neurophysiological examination techniques, which are based on the electrical excitability of the human brain cortex, are thus still indispensable for surgery in eloquent areas such as the primary motor cortex (Brodman Area 4).
How your brain sees your body: Meet the cortical homunculus
A Penfield's Homunculus is a visualization of the primary motor cortex and primary somatosensory cortex. The size of a body region on the model is based on the amount of cortex dedicated to that site, sometimes giving absurd-looking results. This particular example represents the motor cortex. Given the dexterity of our hands and our mouths (for eating and speaking), it is no surprise that so much brain power is given to those areas. Photo credit: carmelo.dimauro via Flickr
48 terms · brain structures for language, Broca's area, Wernicke's area, transverse gyrii of Herschl, supermarginal and angular gyrii, pars orbitalis, pars triangularis, pars opercularis, primary motor cortex, substa
THE MOTOR CORTEX THE BASAL GANGLIA THE CEREBELLUM THE ACTIVATION SEQUENCE FOR THE MOTOR AREAS So many different structures in the brain are involved in motor functions that some people even say that practically the entire brain contributes to body movements. Though the motor cortex is usually associated with Areas 4 and 6, the control of voluntary movements actually involves almost all areas of the neocortex.
The relative homuncular representation of the primary motor cortex reveals the relative sizes of the regions of the primary motor cortex, which represent different parts of the body as determined by electrical stimulation experiments.