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Chapter 36 Animal Brain Organization and Function Chapter 36
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CENTRAL NERVOUS SYSTEM 2 components Brain White matter: inner region Gray matter: outer region Spinal cord White matter: outer region Gray matter: inner region Both covered by 3 protective layers of connective tissue called meninges Dura mater: outer Arachnoid: middle Pia mater: inner
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MAJOR BRAIN REGIONS
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FOREBRAIN Cerebrum (Cerebral Cortex): Also called Cerebral Hemispheres 4 lobes in 2 hemispheres connected by corpus callosum Most complex integrating system in CNS “The Boss”’; controls conscious perception, thought, voluntary motor activity; can override most other systems Frontal lobe: personality defects, speech, aggression, motor Parietal lobe: speech, taste, reading, somatosensory Occipital lobe: vision Temporal lobe: hearing Thalamus: relay station for sensory info to cerebrum Responsible for sensations like pain, body temperature, touch Hypothalamus Regulates pituitary glands; homeostasis, endocrine function Thirst, body temperature, water balance, hormones Limbic System: inner component that controls instincts, emotions, motivation, physiological drives (pleasure, pain,etc) Hippocampus: posterior portion of limbic system; controls long term memory
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LIMBIC SYSTEM Limbic System: inner component that controls instincts, emotions, motivation, physiological drives (pleasure, pain,etc) Hippocampus: posterior portion of limbic system; controls long term memory
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HUMAN BRAIN ORGANIZATION
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MOTOR AND SOMATOSENSORY CORTICES Central sulcus: separates primary motor cortex of frontal lobe from primary somatosensory cortex Motor cortex: controls skeletal muscle movements Somatosensory cortex: takes tactile info and sends to motor cortex Right cortex controls left side of body and vice versa
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TOPOGRAPHIC MAPS Represent different body regions of the primary motor cortex and somatosensory cortex
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MIDBRAIN Is part of brainstem Integrates sensory information Pupillary and visual reflexes Auditory pathways Coordination of movement Primitive functions “pupils are fixed and dilated”…..brain death
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HINDBRAIN 3 parts Cerebellum: balance, muscular coordination Pons (part of brainstem): reflex center; controls respiration Medulla oblongata (part of brainstem): junction of brain and spinal cord Heart rate, BP; vomiting, swallowing, digestion, coughing, sneezing NOTE: The brainstem is made up of the midbrain, pons, and medulla. It connects the spinal cord to the brain and is responsible for many essential/primitive functions. Damage to the brainstem often causes death, therefore, it is now used to test for “brain death” (a more accurate assessment than heart stopping). Damage to relatively large parts of cerebrum or cerebellum may be damaged without being life-threatening (social/higher functioning skills)
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SYNAPTIC PLASTICITY
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IMAGING OF BRAIN FUNCTION
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