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Block-6 Neuro2

Block-6 Neuro Telecephalon - basal Nuclei & white matter

The traditional term used to denote a number of subcortical nuclear masses within the cerebral hemisphere? Includes corpus striatum with caudate nucleus and lentiform (with putamen and globus pallidus) amygdaloid complex and claustrum. AKA - Basal Nuclei
What are the three parts of the corpus striatum? globus pallidus putamn caudate nucleus
Oldest part of corpus striatum from phylogenetic point of view? aka... globus pallidus paleostriatum (pallidum)
Neostraitum or the more recent parts of corpus striatum putamen caudate nucleus
The putamen comes from the neostriatum. The globus pallidus arises from the pallidum. Together they form what? Lentiform nucleus
The clinical and function definition of basal nuclei includes what? corpus straitum subthalamic nucleus (in diencephalon) substantia nigra (in midbrain)
Three problems that arise from a lesion in the basal nuclei? akinesia - poverty of voluntary movement rigidity dyskinesias - purposeless, involuntary movt.
What is an example of poverty of voluntary movement? infrequent blinking of parkinson's patients
What has a head the forms a prominent bulge in the lateral wall of the frontal (anterior) horn of lateral ventricle? body of structure is located superolateral to thalamus and forms lateral wall of body of lateral ventricle corpus striatum
What is the path of the tail of the caudate nucleus? passes inferiorly then anteriorly in temporal lobe, follow roof of temporal (inferior) horn of lateral ventricle
What is the tip of the tail of the caudate nucleus related to? amygdala
What lies lateral to caudate nucleus and thalamus? lentiform nucleus
What separates the lentiform nucleus laterally from the caudate nucleus and thalamus? large bundle of fibers connecting cerebral cortex with subcortical structures (projecting fibers) of the Internal Capsule
The lentiform nucleus is a combination of what two structures? putamen globus pallidus
Where is the lateral medullary lamina found? lateral part of lentiform nucleus is separated from globus pallidus by thin layer of white matter
Anteriorly and inferiorly the putamen becomes continuous with an area associated with the limbic system. What? connection with the head of caudate is known as nucleus acumbens
What is located medial to putamen in the lentiform nucleus globus pallidus
what are the parts of the globus pallidus? What is the thin layer of white matter that separates them? external = lateral internal = medial medial medullary lamina
What is the thin lamina of gray matter located lateral to putamen? claustrum
What lies lateral to claustrum insular cortex
The 2 layers of white matter surrounding the claustrum are known as what external and extreme capsules
What are the three types of white matter in the cerebral hemispheres association fibers commissural fibers projection fibers
Which fibers connect cortical areas within same cerebral hemisphere? association fibers
What fibers connect adjacent gyri short association fibers
What fibers form bundless connection more distant areas of cerebral cortex long association fibers
what is the long association fiber bundle that located deep to cingulate gyrus and parahippocampal gyrus connecting them cingulum
what connects temporal and occipital cortical areas inferior longitudinal fasciculus
What connects frontal and temporal cortical areas uncinate fasciculus
what LAFB is located in the core of the cerebral hemisphere connecting frontal, parietal and occipital cortical areas superior longitudinal fasciculus
What LAFB connects frontal and temporal cortical areas (sometimes considered part of superior longitudinal fasciculus) arcuate fasiculus
what long association fiber bundle runs through the temporal lobe and connects frontal and occipital cortical areas inferior fronto-occipital fasciculus
what LAFB is located between putamen and claustrum external capsule
What LAFB is located between claustrum and insular cortex extreme capsule
What fibers run from one cerebral hemisphere to the other, connecting functionally related areas? Commissural Fibers
What are the 3 types of Commissural fiber bundles (CFB) corpus callosum anterior commissure hippocampal commissure (commisure of fornix)
The largest bundle of commissure fibers corpus callosum
The fiber bundle with a rostrum, genu, body and spleenium corpus callosum
Corpus callosum fibers interconnecting frontal lobes loop through genu to form? minor (frontal) forceps
Corpus callosum fibers interconnecting occipital lobes loop through splenium to form major (occipital) forcep
What commissural fibers are located anterior to column of fornix to interconnect parts of frontal and temporal lobes anterior commissure
What is the thin layer of commissural fibers, inferior to splenium of corpus callosum that extends from on crus of fornix to the other? hippocampal commissure
What is another name for hippocampal commissure? commissure of fornix
What does Soneira liken to a mustache in a slice of brain? anterior commissure
The fibers that connect cerebral cortex with subcortical structures? Projection fibers
Two Types of projection fibers corticofugal - efferent corticopetal - afferent
projection fibers that carry impulses away from the cortex terminate in corpus striatum, thalamus, brainstem, spinal cord = corticofugal
projection fibers that carry impulses toward the cortex originate predominantly from thalamus - thalamocortical fibers = corticopetal
How are the projection fibers organized large compact bundle of fibers forms the internal capsule
What is medial to the internal capsule thalamus and caudate nucleus
What is lateral to the internal capsule lentiform nucleus
Why is Micheal so nice to me? He is nice to everyone, you are nothing special.
What is the orientation of the internal capsule in horizontal sections of the cerebral hemispheres? angulated
What would a horizontal section of internal capsule include: anterior limb, genu, posterior limb, sublenticular limb, retrolenticular limb
The part of the internal capsule located between head of caudate (medially) and lentiform nucleus (laterally) anterior limb
What are the fibers connecting dorsomedial thalamic nuclei with prefontal cortex? frontpontine fibers of anterior limb
What are the fibers connecting anterior thalamic nuclei with cingulate gyrus anterior thalamic radiations of anterior limb
What level is the genu of the internal capsule found interventricular foramen between anterior and posterior limbs
What is in the genu of the internal capsule corticonuclear (corticobulbar)fibers
Posterior limb of the internal capsule contains: corticospinal fibers pareitopontine fibers central thalamic radiations other corticofugal fibers retrolenticular limb sublenticular limb corona radiata
What is the posterior limb of the internal capsule medial to... lentiform nucleus
What is the posterior limb of the internal capsule lateral to... thalamus
central thalamic radiations are fibers that connect ventral lateral and ventral posterior thalamic nuclei with motor and somatosensory areas of cerebral cortex
What are the other corticofugal fibers in the posterior limb of the internal capsule corticorubal and corticoreticular
Why is the posterior limb of the internal capsule clinically important most frequent site for cerebral hemorrhage
What limb in the internal capsule contains occipitopontine fibers and optic radiations retrolenticular limb which is posterior to lentiform nucleus
What are the optic radiations in the retrolenticular limb of the internal capsule fibers running from lateral geniculate to primary visual cortex
What are the fibers of the retrolenticular limb called? geniculocalcarine fibers
What limb fibers are inferior to to the lentiform nucleus sublenticular limb
Where do the fibers of the sublenticular limb travel from medial geniculate nucleus to primary auditory cortex
Which limb of the internal capsule carries fibers for the optic tract retrolenticular limb
Which limb of the internal capsule carries fibers for the auditory cortex sublenticular limb
What forms the corona radiata of the internal capsule? superior to caudate nucleus adn putamen, fibers of internal capsule flare out into cerebral hemisphere
What is the little brother of the corticospinal tract corticonuclear fibers
What tract is organized in somatotropic representation? corticospinal tract runs arms, truck, legs
What is the last step before fibers bend back to enter occipital lobe optic radiations from lateral geniculate body
Internal Capsule Fibers of the: anterior limb frontopontine fibers anterior thalamic radiations
Internal Capsule Fibers of the: Genu corticonuclear fibers
Internal capsule fibers of the: Posterior limb corticofugal fibers central thalamic radiations corticospinal fibers parietopontine fibers
Internal Capsule Fibers of the:Sublenticular Limb Auditory radiations Temporopontine fibers
Internal Capsule Fibers of the: Retrolenticular Limb Optic Radiations Occipitopontine fibrs
What does calcarine mean? spur - like on a devil rooster
What structures should be present to ensure we are at the posterior limb in a slice? thalamus and no butterfly shape or small caudate, should also see inferior horn of lateral ventricle
If you do not see lateral ventrical where is the slice Anterior
For the examine be able to identify in cross section: fig 5.5? note to self on fig 5.5
Created by: El Diablo