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The Whole is greater than the sum of its parts.
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Meninges Protect brain from shock Provide buoyancy Infection: meningitis KW2-5
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Meninges (sketch) Skull Dura mater (tough mother) Arachnoid layer Subarachnoid space filled with CSF Pia mater (soft mother) Cortex (bark)
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Ventricles Cavities in the brain filled with CSF Hydrocephalus is caused by blockage KW 2-9
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CSF Circulation CSF produced in ventricles Chorid plexus CSF circulates thru ventricles and Meninges Brain and spinal cord Spinal tap
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Hydrocephalus Flow of CSF blocked. CSF builds up in ventricles. Ventricles expand. Brain tissue destroyed by pressure. Must drain CSF
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Lobes of the Brain KW 1-1 Lateral ventricles
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Blood Flow to Cortex Important when determining stroke where flow is blocked or blood vessel ruptures. KW 2-7
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Stroke Blood clot blocks flow. Hypertension Artery ruptures. Hemorrhage. Loss of blood supply to brain in both cases.
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Subdural Hematoma Blow to skull ruptures vein. Blood collects under dura. Displaces brain. Pressure must be released.
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Brainstem KW 2-15
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Brains from All Sides KW 2-6
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Reticular Formation Brain’s arousal center KW 2-16
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Midbrain (Colliculi) Old sensory centers for vision and hearing KW 2-18
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Cerebellum Coordination Planning Learning Prediction KW 2-17 Fine motor control
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Brainstem structures Reticular Formation Sleep center Cerebellum Vegetative centers for heart rate, breathing, cough reflex, etc Cranial Nerves Summary: basic body functions Essential for life
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Thalamus Located in very center of brain. “Inner chamber”
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Thalamus and Cortex Thalamus Visual Cortex Eye Thalamus is a Relay Station for the senses
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Hypothalamus Motivation Regulates pituitary Homeostasis KW2-19 Location of the Thalamus Below thalamus we find
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Hypothalamus KW 11-9
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Motivation-Hunger The hypothalamus controls eating and other body maintenance functions
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Hypothalamus and Pituitary KW 11-11
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Motivation and the Hypothalamus Homeostasis –tendency to maintain a balanced or constant internal state Setpoints for eating and drinking. Control endocrine system thru pituitary
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Basal Ganglia Initiates movements like walking. “Starter Motor” Gross motor control
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Basal Ganglia KW 2-23
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Diseases of the Basal Ganglia Huntington’s Disease: A genetic disorder Website: www.hdfoundation.org Nancy Wexler Parkinson’s Disease: Loss of dopamine producing neurons. Website: www.parkinsonaction.org Michael J. Fox
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Limbic System Emotional Brain KW 2-20
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Limbic System Emotional Brain Negative emotions like fear and anger Brain’s “ID” Animal impulses and reactions Balanced in humans by cortex KW 11-14
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Hippocampus and Amygdala KW 2-24
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Experiencing Emotion The Amygdala- a neural key to fear learning Hippocampus (purple)
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Memory components Hippocampus: consolidation of new memories Movie: Memento Amygdala: emotional memory Flashbulb memory Life-changing experiences
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Next: Mapping the cortex
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