Where is the Thalamus
Thalamus (L. “innermost chamber”) is the largest part of the diencephalon. Paired egg-shaped masses located centrally within the cerebral hemispheres
From where does teh thalamus recieve input?
from all parts of the CNS and periphery including all precortical sensory modalities except olfaction
Where does the thalamus sends its output?
Output to most of ipsilateral cortex
Cortical connections are reciprocal (2-way: thalamocortical and corticothalamic)
What does the talamocortical and the corticothalamic fibers form?
form a continuous fan (thalamic radiations)
the thalamus uses both limbs of th einternal capsule (mostly posterior limb)
What does the thalamus form of the 3rd ventricle?
Where is the posterior limb of the internal capsule in relation to the thalamus?
Thalami form the upper walls of the 3rd ventricle
posterior limb of internal capsule (PLIC) is lateral to thalamus
What are the six grops of the thalamus?
What is the medialmost layer?
What is the lateral most layer?
Medialmost- midline nuclei
lateral most-reticular nuclei
What bifuricates the thalamus into mrdial and lateral groups?
and what is the bifurication anterioly?
A sheet of myelinated fibers obliquely bisects the thalamus into ~ medial and lateral groups (= internal medullary lamina )
Anteriorly, the lamina bifurcates around the anterior nucleus
What is the large medial nuclear mass?
mediodorsal (dorsomedial) nucleus (MD = DM)
What is the lateral group arranged into?
The lateral group has the largest number of named nuclei
Lateral nuclei are arranged into dorsal and ventral rows (tiers)
What are the nuclei of the dorsal tier nuclei of the lateral group?
lateral dorsal nucleus
lateral posterior nucleus
What is the most posterior part of the thalamus?
What are the ventral tier nuclei?
ventral lateral (also called ventral intermediate [between ant. & post.)
ventral posterior medial (VPM)
ventral posterior lateral (VPL)
Where are the medial and lateral geniculates found?
Geniculates are prominent thalamic nuclei on its postero-inferolateral surface
What are the intralaminar group?
What is the largest of this group?
Nuclei embedded within the internal lamina
Centromediam nucleus is th elargest of the intralaminar group?