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The Amazing Brain Weighs about 3 pounds Major portions: Cerebrum

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Presentation on theme: "The Amazing Brain Weighs about 3 pounds Major portions: Cerebrum"— Presentation transcript:

1 The Amazing Brain Weighs about 3 pounds Major portions: Cerebrum
Diencephalon Cerebellum Brainstem Made of about 100 billion neurons

2 The Amazing Brain Cerebrum Largest portion Higher mental functions
Diencephalon Processes sensory input Brain Stem Coordinates and regulates visceral activities Cerebellum Coordinates muscle movements

3 Cerebrum Largest portion 2 cerebral hemispheres
connected by CORPUS CALLOSUM Many convolutions to increase surface area

4 Cerebrum Divided into lobes Frontal lobe Parietal lobe Temporal lobe
Occipital lobe

5 Cerebrum Performs higher brain functions Interpreting sensory info
Coordinating muscle movement Intelligence & personality

6 Cerebrum Special areas control different functions Primary Motor Area
(Frontal Lobe) Controls motor impulses Frontal Association Area Thinking, planning, emotions, behavior

7 Cerebrum C. Premotor Area (Frontal Lobe) Behavior planning
Muscle movement for various actions D. Frontal Eye Field Coordinates voluntary eye movements

8 Cerebrum E. General Interpretive Area a.k.a. Wernicke’s Area
(Temporal Lobe) Recognition of written and spoken language F. Broca’s area Coordinates muscles that create speech

9 Cerebrum G. Somatosensory area (Parietal Lobe)
Limb position, touch sensations H. Visual Area (Occipital Lobe) Sight Identification of things we see


11 Hemisphere Dominance Both cerebral hemispheres function in receiving and analyzing sensory input and sending motor impulses to the opposite side of the body. Most people exhibit hemisphere dominance for the language-related activities of speech, writing, and reading.

12 Hemisphere Dominance 90% of the population exhibits left hemisphere dominance Some are right hemisphere dominant Some have equal dominance in both hemispheres The non-dominant hemisphere specializes in nonverbal functions and controls emotions and intuitive thinking.



15 Frontal Lobe Higher level functions: emotions, reasoning, problem solving, judgment, movement, creativity Parietal Lobe Somatosensory Info: touch, pain, taste, pressure Temporal Lobe Hearing and language Occipital Lobe Vision

16 Ventricles Interconnected cavities w/in cerebrum & brainstem
Filled with CSF

17 Diencephalon Area between cerebral hemispheres Thalamus Hypothalamus
Limbic System Glands

18 Diencephalon Thalamus = Switchboard
Directs impulses from spinal cord to correct location in brain

19 Diencephalon Hypothalamus: Heart rate & blood pressure Body temp.
Water/salt balance Hunger/weight Movements & secretions of stomach & intestines Hormone secretion Sleep & wakefulness

20 Diencephalon LIMBIC SYSTEM – emotions & expression AMYGDALA
Recognizes facial expressions Assesses situation and responds Primitive decision-making center Emotions

21 Diencephalon LIMBIC SYSTEM HIPPOCAMPUS Memory Spatial navigation

22 Brainstem Connects cerebrum & spinal cord Parts: Pons- breathing rate
Medulla Oblongata- Heart rate, BP, Sneezing, coughing, vomitting

23 Cerebellum coordinates skeletal muscle activity balance equilibrium
maintains posture

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