Anatomy of the Central Nervous System Lecture 3. Telencephalon - Cortex n Gray Matter l Somas and...
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Transcript of Anatomy of the Central Nervous System Lecture 3. Telencephalon - Cortex n Gray Matter l Somas and...
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 ~
Association Fibers
interconnect cortical areas within each hemisphere
Projection Fibers
all other fiber systems Fornix Corticospinal tract Mammillothalamic tract
Naming convention ~
The Limbic System
Emotion Learning & Memory Structures
Thalamus Hypothalamus Hippocampus Cingulate gyrus Amygdala Fornix ~
Basal Ganglia
Extrapyramidal Motor System Caudate Putamen Globus Pallidus
Claustrum Amygdala
no motor function ~
Striatum
Lenticular Nucleus
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 ~
Mesencephalon
Surrounds cerebral aqueduct Tectum
Superior Colliculi - vision Inferior Colliculi - audition
Tegmentum
Tegmentum
Periaqueductal Gray - pain Reticular Formation - sleep and
arousal, attention Red Nucleus and Substantia Nigra -
motor system Ventral Tegmental Area - VTA -
reinforcement
PAG
Substantia Nigra
Reticular formation
Cross-section of Tegmentum
VentralTegmentalArea
Dorsal
Red Nucleus
Metencephalon
Surrounds fourth ventricle Cerebellum
coordinates movements Pons
Sleep and arousal Reticular formation ~