Thalamus Flashcards
(23 cards)
The thalamus is divided into a:
media, lateral and anterior nuclear groups
The thalamus is divided by
internal medullary lamina
Inside the internal medullary lamina there is a nuclei called
Intralaminar nuclei
Forms a sheet enveloping the lateral aspect of the thalamus
Reticular nucleus
The anterior part of the thalamus contains the
anterior thalamic nuclei
The anterior part of the thalamus receives the
Mamillothalamic tract from the mammillary nuclei
The anterior thalamic nuclei receive reciprocal connections with the
cingulate gyrus and hypothalamus
the function of the anterior thalamic nuclei is concerned
Emotional tone and the mechanisms of recent memory
The medial part of the thalamus contains”
Dorsomedial nucleus, centromedian nucleus, ventral posteromedial nucleus
Dorsomedial nucleus has afferent and efferent connections with the nuclei of the
Hypothalamus and Prefrontal cortex
The 3 nuclei of the medial part of thalamus integrate sensory information including:
Somatic and visceral information, and the relation of the information to one’s emotions
The lateral thalamic nuclei are subdivided into
a dorsal tier and ventral tier
Dorsal Tier of the nucleus consist of the following nuclei:
Lateral dorsal nucleus
Lateral Posterior nucleus
Pulvinar nucleus
Lateral dorsal nucleus
processes somatosensory information
Lateral posterior nucleus
Determining visual saliency, visually guided behaviors
Pulvinar nucleus
Visual information processing, integrating visual and motor signals
Lateral dorsal nucleus , Lateral Posterior nucleus, Pulvinar nucleus have interconnections with
parietal lobe, cingulate gyrus, occipital and temporal lobes
Ventral Tier of Lateral Subdivision includes:
Ventral anterior nucleus
Ventral lateral nucleus
Ventral posterior nucleus subdivided:
Ventral posteromedial nucleus
Ventral posterolateral nucleus
Ventral anterior nucleus
Receives neuronal inputs from the basal ganglia. Its main afferent arises from the globes pallidus. The efferent fibers from this nucleus pass into the premotor cortex for initiation and planning movement.
Ventral lateral nucleus
Serves as a central integrative center for motor control, receiving inputs from the cerebellum, striatum and cortex and projecting to the primary motor cortex
Ventral posterior nucleus subdivided:
Ventral posteromedial nucleus
Receives sensory information from the face and gustatory pathways via the trigeminal nerve
Ventral posterior nucleus subdivided:
Ventral posterolateral nucleus
receives the important ascending sensory tracts, for pain, temperature and crude touch via the spinothalamic tract and the medial lemniscus (the medial division of the VPL receives inputs from the face, while the lateral division receives inputs from the rest of the body)