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Anatomy of theCentral Nervous System:
Forebrain
Lecture 5
Telencephalon - Cortex
Gray Matter Somas and Dendrites
Neocortex - 6 layers Sensory input ---> layer IV Motor output ---> layer V
Paleocortex - 2 or 3 layers ~
Telencephalon - Fiber Systems
White Matter - myelinated axons 3 types of fiber systems
Commissural Association Projection ~
Commissural Fibers
Interconnect homologous structures in the two hemispheres Corpus Callosum Anterior and Posterior Hippocampal ~
AnteriorAnterior
Association Fibers interconnect cortical areas within each
hemisphere Projection Fibers
• all other fiber systems Fornix Corticospinal tract Mammillothalamic tract
Naming convention ~
Association & Projection Fibers
Association
Commissural
Projection
HemispheresLeft Right
The Limbic System
Emotion Learning & Memory Structures
Thalamus Hypothalamus Hippocampus Cingulate gyrus Amygdala Fornix ~
Amygdala
Hippocampus
Limbic System
Thalamus
Hypothalamus
Cingulate gyrus
Fornix
Basal Ganglia
Extrapyramidal Motor System Caudate Putamen Globus Pallidus
Striatum
Lenticular Nucleus
Claustrum
Amygdala
no motor function ~
Caudate
AmygdalaPutamen
Globuspallidus
Claustrum
Diencephalon
Surrounds third ventricle Thalamus
sensory and motor relay nuclei Hypothalamus
motivation & emotion ~
Thalamus
Lateral Geniculate Nuclei - LGN vision
Medial Geniculate Nuclei - MGN audition
Ventroposterior Nuclei - VPL & VPM somatosensation
Massa Intermedia - crosses midline ~
Hypothalamus
Control of behaviors critical to survival Feeding Fighting Fleeing Mating
Controls the pituitary gland ~
Thalamus
Diencephalon: thalamus
LGNMGN
MassaIntermedia
Diencephalon
HypothalamusPituitary Stalk