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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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telencephalon cortex
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
Telencephalon - Fiber Systems
  • White Matter - myelinated axons
  • 3 types of fiber systems
    • Commissural
    • Association
    • Projection ~
commissural fibers
Commissural Fibers
  • Interconnect homologous structures in the two hemispheres
    • Corpus Callosum
    • Anterior and Posterior
    • Hippocampal ~
slide5

Anterior

Anterior

association projection fibers
Association & Projection Fibers
  • Association Fibers
    • interconnect cortical areas within each hemisphere
  • Projection Fibers
      • all other fiber systems
    • Fornix
    • Corticospinal tract
    • Mammillothalamic tract
  • Naming convention ~
slide7

Hemispheres

Left Right

Association

Commissural

Projection

the limbic system
The Limbic System
  • Emotion
  • Learning & Memory
  • Structures
    • Thalamus
    • Hypothalamus
    • Hippocampus
    • Cingulate gyrus
    • Amygdala
    • Fornix ~
slide9

Limbic System

Cingulate gyrus

Hippocampus

Fornix

Thalamus

Hypothalamus

Amygdala

basal ganglia

Striatum

Lenticular

Nucleus

Basal Ganglia
  • Extrapyramidal Motor System
    • Caudate
    • Putamen
    • Globus Pallidus
  • Claustrum
  • Amygdala
    • no motor function ~
slide11

Globus

pallidus

Putamen

Caudate

Amygdala

diencephalon
Diencephalon
  • Surrounds third ventricle
  • Thalamus
    • sensory and motor relay nuclei
  • Hypothalamus
    • motivation & emotion ~
thalamus
Thalamus
  • Lateral Geniculate Nuclei - LGN
    • vision
  • Medial Geniculate Nuclei - MGN
    • audition
  • Ventroposterior Nuclei - VPL & VPM
    • somatosensation
  • Massa Intermedia - crosses midline ~
hypothalamus
Hypothalamus
  • Control of behaviors critical to survival
    • Feeding
    • Fighting
    • Fleeing
    • Mating
  • Controls the pituitary gland ~
slide17

Diencephalon: thalamus

Massa

Intermedia

MGN

LGN

slide18

Pituitary Stalk

Diencephalon

Hypothalamus