The gray matter of the primary somatosensory coex contains six layers of cells. Which layer(s) receive the bulk of incoming signals from the somatosensory nuclei of the thalamus?
Layer IV of the somatosensory coex receives the bulk of the input from the somatosensory nuclei of the thalamus. The cerebral coex contains six layers of neurons, beginning with layer I next to the brain surface and extendingprogressively deeper to layer VI. The incoming sensory signal excites neuronal layer IV first; the signal then spreads toward the surface of the coex and also toward deeper layers.
I
II and III
III only
IV
Sensory System