Unit 6 Flashcards
The somatosensory tracts, left and right, that ascend in the dorsal spinal cord; they are composed of the axons of sensory neurons carrying information about touch and proprioception from ipsilateral receptors
Dorsal Columns
2 pairs of nuclei, 2 on the left and 2 on the right, in the dorsal medulla; they receive ipsilateral somatosensory input via the ascending dorsal columns
Dorsal Column Nuclei
2 somatosensory tracts that ascend from the medulla to the thalamus; each ascends from dorsal column nuclei and decussates to the contralateral ventral posterior nucleus
Medial Lemnisci
The 2 medullary nuclei, left and right, that receive somatosensory input from the ipsilateral half of the face via the trigeminal nerves
Trigeminal Nuclei
The thalamic nuclei, left and right, that relay somatosensory information from the medial lemnisci to the ipsilateral primary somatosensory cortex
Ventral Posterior Nuclei
The areas of cerebral cortex, one left and one right, that receive somatosensory input from the thalamus; largely from the ventral posterior nuclei; located in the postcentral gyrus of each hemisphere
Primary Somatosensory Cortex
The somatotopic maps that constitute primary somatosensory cortex
Somatosensory Homunuculus
The areas of cortex in each hemisphere that receive most of their input from primary somatosensory cortex; located in the post postcentral gyrus just inferior to the primary somatosensory cortex
Secondary Somatosensory Cortex
The area of mesencephalic gray matter that surrounds the cerebral aqueduct; neurons of the ( ) are excited by endorphins and by opiate analgesics
Periaqueductal Gray
The narrow midbrain channel that connects the 3rd and 4th ventricles
Cerebral Aqueduct
The thin vertical sheet of serotonergic nuclei that is located along the midline of the reticular formation
Raphe Nuclei
