1-18-BrainOrganization

1-18-BrainOrganization - Organization of the Brain...

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1 Organization of the Brain Organization of the Brain Major Structures of the Brain • Functional Organization of the Cortex • Lateralization of Function The Nervous System Central Nervous System (CNS) – Brain and Spinal Cord Peripheral Nervous System (PNS) – Everything else – Two Divisions: Somatic : nerves that control the skeletal musculature and transmission of information from sense organs Autonomic : nerves that provide the brain with information regarding visceral functions (heart, lungs, digestive system, etc.)
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2 White and Gray Matter White Matter • Myelinated axons Gray Matter • Cell bodies • Dendrites • Unmyelinated axons The Brain Hindbrain Medulla – breathing, swallowing, heart rate, balance Pons – sleep, attention, eye movements Cerebellum – balance and muscle movement
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3 Midbrain The midbrain controls orienting movements toward stimuli (e.g., eye movements, ear tipping, head movements) Superior Colliculus – Visual orienting Inferior Colliculus – Auditory orienting Other midbrain structures are involved in the regulation of body temperature, pain perception, and the sleep-wake cycle Forebrain • The forebrain consists of everything above the midbrain • Consists of the cerebral cortex and a number of subcortical structures • Two hemispheres (left and right) • Most developed in mammals Top view Thalamus Relay station for all sensory information (except smell) – Filters information and directs to correct cortical areas Hypothalamus
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1-18-BrainOrganization - Organization of the Brain...

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