ASTRO-110 Lecture Notes - Lecture 21: Ventral Posterior Nucleus, Secondary Somatosensory Cortex, Posterior Parietal Cortex
22 Sep 2020
School
Department
Course
Professor
Document Summary
Sensory neurons enter the spinal cord via dorsal root ascend ipsilaterally in the dorsal columns and synapse in the dorsal column nuclei of the medulla. Axons of dorsal column nuclei decussate (cross over to the other side of the brain) and then ascend in the medial lemniscus to the contralateral ventral posterior nucleus of the thalamus. Ventral posterior nuclei also receive input via the three branches of the trigeminal nerve which carry somatosensory information from the contralateral areas of the face. Most neurons of the ventral posterior nucleus project to the primary somatosensory cortex while others project to the secondary somatosensory cortex or posterior parietal cortex. Anterolateral system comprises three different tracts same thalamic sites sensation from below the level of the cut somatosensory cortex and other parts of the brain. Spinothalamic tract, spinorecticular trace and spinotectal tract. The three branches carry pain and temperature information from the face to the.
