NPTE Neurological Practice Test

Most sensory information is routed through the thalamus before reaching the cortex, making it a central relay hub. Visual signals go from the retina to the lateral geniculate nucleus and then to the primary visual cortex. Auditory signals travel to the medial geniculate nucleus and onward to the auditory cortex. Somatosensory information passes through the ventral posterior nucleus (VPL and VPM) before reaching the somatosensory cortex. Olfaction is the exception: odorant signals travel from the nasal epithelium to the olfactory bulb and then directly to primary olfactory cortex and related limbic areas, with thalamic relay not required for the initial perception. While thalamic involvement can occur later in higher-order processing, the primary routing bypasses the thalamus. Therefore, smell is the modality that does not relay through thalamic nuclei.