This dual-panel educational graphic illustrates the neuroanatomical origins and typical waveforms of median nerve somatosensory evoked potentials (SSEPs). Panel (a) features sagittal and coronal MRI sections of the head and neck, mapping specific SSEP components to their anatomical generators. Key markers include N9 at the brachial plexus (Erb's point), N13 at the cervical spinal cord, P14 at the cervico-medullary junction, and N20/P25 at the primary sensory cortex. Yellow dashed lines represent the ascending somatosensory pathway from the peripheral nerve to the cortex. Panel (b) displays corresponding normal physiological waveforms across four standard recording montages: Erb-Fz (showing the N9 peak), Cv7-Fz (N13 peak), Cz-cSh (P14 subcortical potential), and C3'-Fz (cortical N20 peak and P25 trough). The graphic provides a clinical correlation between neuroimaging and neurophysiological monitoring, useful for identifying site-specific conduction delays or signal abolishment in neurology and intensive care settings.

This medical infographic illustrates the scoring system for the Evoked Potential Score (EPS), used in assessing Somatosensory Evoked Potentials (SSEP) and Brainstem Auditory Evoked Potentials (BAEP) in neurological patients. The layout features six anatomical diagrams of the human brain from a superior (top-down) view, arranged in a 2x3 grid. Each brain is divided into left and right hemispheres, each labeled with a qualitative assessment: 'absent', 'abnormal', or 'normal'. Each diagram corresponds to a numerical EPS value from 1 to 6. The sequence demonstrates a hierarchical progression of electrophysiological recovery or function: (1) Bilateral absent, (2) Left absent/Right abnormal, (3) Left absent/Right normal, (4) Bilateral abnormal, (5) Left normal/Right abnormal, and (6) Bilateral normal. This grading system provides a standardized method for clinicians to quantify neurophysiological status, specifically in contexts like poor-grade subarachnoid hemorrhage (SAH) or ventilator weaning, where prognostic markers for neurological improvement and the modified Rankin Scale (mRS) are evaluated.

This medical figure presents current density reconstructions (CDR) and corresponding anatomical localizations for cortical somatosensory evoked potential (CSEP) waveform components (P50, N70, P100, N140a, and N140b) in children with normal hearing. Panel A displays sLORETA-derived cortical activations mapped onto sagittal and coronal MRI slices, accompanied by MNI coordinates. The likelihood of activation is indicated by an F-distribution color scale ranging from black (minimum) to yellow (maximum). Panel B provides a summary table of the significant brain regions involved. For the early components (P50, N70, P100), activation is primarily localized to the left hemisphere within the post-central gyrus (Brodmann areas 2, 3, 5, 40), pre-central gyrus (BA 4, 6), and the inferior/superior parietal lobules (BA 40, 7). Late components (N140a, N140b) demonstrate similar parietal activity but show additional involvement of the medial and superior frontal gyri (BA 6) and bilateral activation of the pre-central gyrus. These maps illustrate the typical spatio-temporal progression of cortical processing following right-sided vibrotactile stimulation.