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Terms in this set (33)
Largest section of the diencephalon, it is composed of pools of neurons that project to almost every part of the cerebral cortex. It is connected by the massa intermedia.
This part of the diencephalon is connected to the forebrain, brainstem, and spinal cord. It is involved in visceromotor (autonomic) functions and is distinguished on the wall of the 3rd ventricle and lamina terminalis.
Part of the diencephalon that sits at the junction of the diencephalon and the midbrain.
Part of the diencephalon associated with the limbic system and pineal gland
Each thalamus is ________ to the third ventricle
Each thalamus is ________ to the internal capsule
Each thalamus is ________ to the intervantricular foramen
General Functions of Thalamus
Process, integrate, and relay information related to the 1) sensory system, motor system, and information 2) state of consciousness, alertness, and attention
Structure that 1) receives input from subcortical structures 2) projects efferent fibers to the cerebral cortex (these same regions of the cerebral cortex project back to the thalamic nucleus)
Internal Medullary Lamina
Y-shaped myelinated fibers that separate the anterior, medial, lateral nuclear groups
Structures that are embedded within the internal medullary lamina (central median, paracentral nucleus, central lateral nucleus...centromedian nucleus, parafascicular nucleus) characterized by projections to the neostriatum and to other thalamic nuclei. Function in motor relay, sensorimotor integration, cerebral arousal/level of consciousness, and part of diffuse pain pathway.
Structure that lays as a sheet on lateral surface of the thalamus. Axons from here project medially into the nuclei of the dorsal thalamus of to other parts of the reticular nucleus, but not into the cerebral cortex. Acts to eavesdrop on pathways running to and from the thalamus and modulates those pathways activity...uses GABA.
Structure that lays as a sheet on the medial surface, right along the 3rd ventricle. Very little is known about this structure, but is suggested to have a relationship with the limbic system.
Ventral Posterior Nucleus
1) Ventral posterolateral 2) Ventral posteriomedial 3) Ventral posterior inferior 4) Ventromedian nuclei
Ventral Posterior Lateral Nucleus
This nucleus receives somatosensory from the trunk and limbs. The fibers come from the medial lemniscus, posterior columns, spinothalamic tract and terminate in the SI (primary sensory) cortical areas.
ventral posterior medial nucleus
This Nucleus receives somatosensory from the head. The fibers come from the trigeminothalamic tracts and terminate in SI (primary sensory) cortical areas.
ventral posterior inferior and ventromedian nuclei
This nucleus receives somatosensory noxious information. The fibers come from the spinothalamic tract and anterior trigeminothalamic tract and terminate in SII (primary motor) cortical areas.
This nucleus receives noxious somatosensory and auditory information from no specific tract. The fibers run through the posterior complex and terminate in SII (primary motor) cortical areas.
Internal Arcuate Fibers
These fibers ascend in the posterior column before decussating at the medulla to become the medial lemniscus. They relay fine touch and proprioception to the thalamus and ultimately the cerebral cortex.
Somatotopic Organization of the VPL and VPM
This organization serves as a body map, where the areas associated with the head lie medially in the thalamus and the areas associated with the limbs (legs especially) are more lateral.
Sensation associated with the ventral posteromedial nucleus that proceeds to the SII motor area in the cerebral cortex
Sensation associated with parts of the VPL, VPI & posterior complex nuclei. The sensation then travels to both the SI and SII areas of the cerebral cortex
Medial Geniculate Body
Sensation associated with the auditory via brachium of inferior colliculus that travels to the primary auditory lobe of the cerebral cortex and to the superior temporal lobe
Lateral Geniculate Body
Sensation associated with the vision via optic tracts that travels to the primary visual area of and occipital lobe of the cerebral cortex
Ventral Lateral Pars Oralis and Caudalis
Nuclei that receive information from the cerebellum and go to the primary motor cortex, premotor cortex, supplementary motor area, and parietal lobe for motor planning & motor control
Ventral Anterior and Ventral Lateral: Pars Oralis
Nuclei that receive information from the globus pallidus & substantia nigra and go to the supplementary motor cortex, pre and primary motor cortex for motor control
Ventral Anterior and MD
Nuclei that receive information from the globus pallidus & substantia nigra and go to the frontal eye fields for eye movement
Limbic system influences memory, learning, and behavior.
This structure receives projections from the mammillary nuclei and the hippocampal formation. Its output goes to the cingulate gyrus of cerebral cortex.
This structure plays a role in speech and visual functions including eye movements. Also, stimulates behavioral orientation toward relevant stimuli.
Pulvinar Inferior Divisions
Receives fibers from the superior colliculus (contralateral visual hemifield) and projects to the occipital lobe
Pulvinar anterior, lateral, and medial divisions
Relays information with the temporal cortex including Wernicke's speech area, parietal, and frontal lobes.
Functional Classifications of Nuclei
1) Specific Nuclei (relay and association) 2) Widely Projecting Nuclei (midline and intralaminar nuclei) 3) Inter-thalamic Nuclei (reticular nucleus)
THIS SET IS OFTEN IN FOLDERS WITH...
Tracts, Nuclei, etc.
Cerebellum and blood supply to brainstem
Cranial Nerves in CNS
General Sensory System
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