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Anatomy of the Central Nervous System: Forebrain

Anatomy of the Central 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.

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Anatomy of the Central Nervous System: Forebrain

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  1. Anatomy of theCentral Nervous System:Forebrain Lecture 5

  2. Telencephalon - Cortex • Gray Matter • Somas and Dendrites • Neocortex - 6 layers • Sensory input ---> layer IV • Motor output ---> layer V • Paleocortex - 2 or 3 layers ~

  3. Telencephalon - Fiber Systems • White Matter - myelinated axons • 3 types of fiber systems • Commissural • Association • Projection ~

  4. Commissural Fibers • Interconnect homologous structures in the two hemispheres • Corpus Callosum • Anterior and Posterior • Hippocampal ~

  5. Anterior Anterior

  6. Association & Projection Fibers • Association Fibers • interconnect cortical areas within each hemisphere • Projection Fibers • all other fiber systems • Fornix • Corticospinal tract • Mammillothalamic tract • Naming convention ~

  7. Hemispheres Left Right Association Commissural Projection

  8. The Limbic System • Emotion • Learning & Memory • Structures • Thalamus • Hypothalamus • Hippocampus • Cingulate gyrus • Amygdala • Fornix ~

  9. Limbic System Cingulate gyrus Hippocampus Fornix Thalamus Hypothalamus Amygdala

  10. Striatum Lenticular Nucleus Basal Ganglia • Extrapyramidal Motor System • Caudate • Putamen • Globus Pallidus • Claustrum • Amygdala • no motor function ~

  11. Globus pallidus Putamen Caudate Amygdala

  12. Claustrum

  13. Diencephalon • Surrounds third ventricle • Thalamus • sensory and motor relay nuclei • Hypothalamus • motivation & emotion ~

  14. Thalamus • Lateral Geniculate Nuclei - LGN • vision • Medial Geniculate Nuclei - MGN • audition • Ventroposterior Nuclei - VPL & VPM • somatosensation • Massa Intermedia - crosses midline ~

  15. Hypothalamus • Control of behaviors critical to survival • Feeding • Fighting • Fleeing • Mating • Controls the pituitary gland ~

  16. Thalamus

  17. Diencephalon: thalamus Massa Intermedia MGN LGN

  18. Pituitary Stalk Diencephalon Hypothalamus

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