chapter 14
DESCRIPTION
Chapter 14. The Brain. Medulla Oblongata. Regulates heartbeat and respirations Blood vessel diameter Decussation Reflexes: Swallowing Vomiting Coughing Sneezing Hiccuping. The Pons. Relays impulses Pneumotaxic area Apneustic area. Reticular Activating System (RAS). - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 14
The Brain
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Medulla Oblongata• Regulates heartbeat
and respirations• Blood vessel diameter• Decussation• Reflexes:
– Swallowing– Vomiting– Coughing– Sneezing– Hiccuping
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The Pons
• Relays impulses• Pneumotaxic area• Apneustic area
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Reticular Activating System (RAS)
• Extends from the upper spinal cord up to the lower diencephalon.
• Helps maintain consciousness.• Arouses the cerebral cortex to wake us up.• Aids in muscle tone.• Acts as a filter for extraneous sights and
sounds.
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Midbrain
• Movements of the eyeballs
• Visual reflex• Auditory reflex
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Thalamus• Sensory relay system• Interprets pain,
temperature, light touch and pressure sensations.
• Some function in emotions and memory.
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Functions of the Hypothalamus• Controls autonomic system – smooth muscles,
cardiac muscle, glands.• Visceral sensory impulses• Controls pituitary• Mind over body phenomena• Feelings of rage and aggression• Controls body temperature• Regulates food intake – satiety center• Thirst center – control of kidneys• Maintains waking state• Biological rhythms / circadian rhythms
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Regions of the Thalamus
• Epithalamus – consists of the pineal gland and the habenular nuclei. Pineal secretes melatonin. Nuclei have emotional responses to odors.
• Subthalamus – help to control body movements.
• Circumventricular organs – monitor chemical changes in the blood. Coordinate homeostatic activities.
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Functions of the Cerebellum
• Muscle Tone• Posture• Equilibrium• Smooth
coordinated movements
• Predicting a future body position
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Lobes of the Cerebrum• Frontal• Parietal• Temporal• Occipital• Limbic• Insula
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Basal Ganglia• Includes globus pallidus, putamen and cuadate
nuclei.• Help to regulate initiation and termination of
movements.• Control subconscious movements of skeletal
movements.• Laughing.• Area is affected by Parkinson’s disease and may
play a role in obsessive compulsive disorders anxiety and schizophrenia.
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The Limbic System
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Functions of the Limbic System
• Short term memory• Emotions: pleasure and pain rage,
tameness, affection, docility, anger, fear, sorrow, and sexual feelings.
• Hippocampus plays a role in depression and is the major section to move memories from short term to long term.
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Brodemann’s Classification
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The Insula
• A triangular brain area of the cerebrum beneath the other major lobes.
• Integrates cerebral activities• Some function in memory
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Brodemann’s sites to learn
• Primary visual area• Visual association• Somatosensory area• Primary sensory area• Primary motor area• Wernicke’s area• Broca’s area
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More on Brodemann’s
• Gustatory area• Primary auditory area• Auditory association area• Prefrontal lobe
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The EEG
• Alpha = relaxing• Beta = thinking• Theta = stress• Delta = deep
sleep
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Cranial Nerves
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Terms
• Concussion• Contusion• Aphasia• CVA (cerebrovascular accident)• TIA (transient ischemic attack)• Alzheimer’s disease• Agnosia• Apraxia
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More Terms
• Delirium• Dementia• Senility• Encephalitis• Lethargy• Stupor• Ataxia