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Slide 1 - The Human Brain Master Watermark Image: http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 2 - The Cerebrum Part I: Lobes, the Cerebral Cortex, and Cortical Regions of the Brain
Slide 3 - Objectives: Students will be able to describe the general structure of the Cerebrum and Cerebral Cortex. Students will be able to identify the Cerebrum, the Lobes of the Brain, the Cerebral Cortex, and its major regions/divisions. Students will be able to describe the primary functions of the Lobes and the Cortical Regions of the Brain.
Slide 4 - Cerebrum -The largest division of the brain. It is divided into two hemispheres, each of which is divided into four lobes. http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 5 - Cerebral Cortex - The outermost layer of gray matter making up the superficial aspect of the cerebrum. http://www.bioon.com/book/biology/whole/image/1/1-6.tif.jpg
Slide 6 - Cerebral Features: Sulci – Small grooves dividing the gyri Central Sulcus – Divides the Frontal Lobe from the Parietal Lobe Fissures – Deep grooves, generally dividing large regions/lobes of the brain Longitudinal Fissure – Divides the two Cerebral Hemispheres Transverse Fissure – Separates the Cerebrum from the Cerebellum Sylvian/Lateral Fissure – Divides the Temporal Lobe from the Frontal and Parietal Lobes Gyri – Elevated ridges “winding” around the brain.
Slide 7 - Gyri (ridge) Fissure (deep groove) Sulci (groove) http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 8 - Longitudinal Fissure Transverse Fissure Sylvian/Lateral Fissure Central Sulcus http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg http://www.dalbsoutss.eq.edu.au/Sheepbrains_Me/human_brain.gif Specific Sulci/Fissures:
Slide 9 - Lobes of the Brain (4) Frontal Parietal Occipital Temporal * Note: Occasionally, the Insula is considered the fifth lobe. It is located deep to the Temporal Lobe. http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 10 - Lobes of the Brain - Frontal The Frontal Lobe of the brain is located deep to the Frontal Bone of the skull. (Investigation: Phineas Gage) It plays an integral role in the following functions/actions: - Memory Formation - Emotions - Decision Making/Reasoning - Personality Investigation (Phineas Gage) Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 11 - Frontal Lobe - Cortical Regions Orbitofrontal Cortex – Site of Frontal Lobotomies Primary Motor Cortex (Precentral Gyrus) – Cortical site involved with controlling movements of the body. Broca’s Area – Controls facial neurons, speech, and language comprehension. Located on Left Frontal Lobe. Broca’s Aphasia – Results in the ability to comprehend speech, but the decreased motor ability (or inability) to speak and form words. Olfactory Bulb - Cranial Nerve I, Responsible for sensation of Smell * Desired Effects: - Diminished Rage - Decreased Aggression - Poor Emotional Responses * Possible Side Effects: - Epilepsy - Poor Emotional Responses - Perseveration (Uncontrolled, repetitive actions, gestures, or words)
Slide 12 - Primary Motor Cortex/ Precentral Gyrus Broca’s Area Orbitofrontal Cortex Olfactory Bulb Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg Regions Investigation (Phineas Gage)
Slide 13 - Lobes of the Brain - Parietal Lobe The Parietal Lobe of the brain is located deep to the Parietal Bone of the skull. It plays a major role in the following functions/actions: - Senses and integrates sensation(s) Spatial awareness and perception (Proprioception - Awareness of body/ body parts in space and in relation to each other) Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 14 - Parietal Lobe - Cortical Regions Primary Somatosensory Cortex (Postcentral Gyrus) – Site involved with processing of tactile and proprioceptive information. Somatosensory Association Cortex - Assists with the integration and interpretation of sensations relative to body position and orientation in space. May assist with visuo-motor coordination. Primary Gustatory Cortex – Primary site involved with the interpretation of the sensation of Taste.
Slide 15 - Primary Somatosensory Cortex/ Postcentral Gyrus Primary Gustatory Cortex Somatosensory Association Cortex Regions Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 16 - Lobes of the Brain – Occipital Lobe The Occipital Lobe of the Brain is located deep to the Occipital Bone of the Skull. Its primary function is the processing, integration, interpretation, etc. of VISION and visual stimuli. Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 17 - Occipital Lobe – Cortical Regions Primary Visual Cortex – This is the primary area of the brain responsible for sight -recognition of size, color, light, motion, dimensions, etc. Visual Association Area – Interprets information acquired through the primary visual cortex.
Slide 18 - Primary Visual Cortex Visual Association Area Regions Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 19 - Lobes of the Brain – Temporal Lobe The Temporal Lobes are located on the sides of the brain, deep to the Temporal Bones of the skull. They play an integral role in the following functions: Hearing Organization/Comprehension of language Information Retrieval (Memory and Memory Formation) Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 20 - Temporal Lobe – Cortical Regions Primary Auditory Cortex – Responsible for hearing Primary Olfactory Cortex – Interprets the sense of smell once it reaches the cortex via the olfactory bulbs. (Not visible on the superficial cortex) Wernicke’s Area – Language comprehension. Located on the Left Temporal Lobe. - Wernicke’s Aphasia – Language comprehension is inhibited. Words and sentences are not clearly understood, and sentence formation may be inhibited or non-sensical.
Slide 21 - Primary Auditory Cortex Wernike’s Area Primary Olfactory Cortex (Deep) Conducted from Olfactory Bulb Regions Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 22 - Arcuate Fasciculus - A white matter tract that connects Broca’s Area and Wernicke’s Area through the Temporal, Parietal and Frontal Lobes. Allows for coordinated, comprehensible speech. Damage may result in: - Conduction Aphasia - Where auditory comprehension and speech articulation are preserved, but people find it difficult to repeat heard speech. Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 23 - Click the Region to see its Name Korbinian Broadmann - Learn about the man who divided the Cerebral Cortex into 52 distinct regions: http://en.wikipedia.org/wiki/Korbinian_Brodmann Modified from: http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg
Slide 24 - Lobes and Structures of the Brain B. A. C. D. E. F. G. http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 25 - Lobes and Structures of the Brain B. A. (groove) C. (groove) D. E. F. G. B. Frontal Lobe G. Parietal Lobe F. Occipital Lobe D. Temporal Lobe A. Central Sulcus (groove) E. Transverse Fissure C. Sylvian/Lateral Fissure http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 26 - Cortical Regions A. B. C. D. E. F. G. H. I. J. K. http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 27 - Cortical Regions A. B. C. D. E. F. G. H. I. J. K. A. Primary Motor Cortex/ Precentral Gyrus B. Broca’s Area C. Orbitofrontal Cortex K. Primary Somatosensory Cortex/ Postcentral Gyrus I. Primary Gustatory Cortex J. Somatosensory Association Cortex G. Primary Visual Cortex H. Visual Association Area E. Primary Auditory Cortex F. Wernike’s Area D. Primary Olfactory Cortex (Deep) http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif
Slide 28 - Q: Assuming this comical situation was factually accurate, what Cortical Region of the brain would these doctors be stimulating? Copyright: Gary Larson
Slide 29 - A: Primary Motor Cortex * This graphic representation of the regions of the Primary Motor Cortex and Primary Sensory Cortex is one example of a HOMUNCULUS: Homunculus
Slide 30 - Q: What do you notice about the proportions depicted in the aforementioned homunculus? Q: What is meant by depicting these body parts in such outrageous proportions? A: They are not depicted in the same scale representative of the human body. A: These outrageous proportions depict the cortical area devoted to each structure. - Ex: Your hands require many intricate movements and sensations to function properly. This requires a great deal of cortical surface area to control these detailed actions. Your back is quite the opposite, requiring limited cortical area to carry out its actions and functions, or detect sensation. Back-Hom. * Note: Homunculus literally means “little person,” and may refer to one whose body shape is governed by the cortical area devoted to that body region.
Slide 31 - Further Investigation Phineas Gage: Phineas Gage was a railroad worker in the 19th century living in Cavendish, Vermont. One of his jobs was to set off explosive charges in large rock in order to break them into smaller pieces. On one of these instances, the detonation occurred prior to his expectations, resulting in a 42 inch long, 1.2 inch wide, metal rod to be blown right up through his skull and out the top. The rod entered his skull below his left cheek bone and exited after passing through the anterior frontal lobe of his brain. Frontal
Slide 32 - Remarkably, Gage never lost consciousness, or quickly regained it (there is still some debate), suffered little to no pain, and was awake and alert when he reached a doctor approximately 45 minutes later. He had a normal pulse and normal vision, and following a short period of rest, returned to work several days later. However, he was not unaffected by this accident. Learn more about Phineas Gage: http://en.wikipedia.org/wiki/Phineas_Gage Frontal http://www.sruweb.com/~walsh/gage5.jpg
Slide 33 - Q: Recalling what you have just learned regarding the frontal lobe, what possible problems or abnormalities may Gage have presented with subsequent to this type of injury (remember the precise location of the rod through his brain)? A: Gage’s personality, reasoning, and capacity to understand and follow social norms had been diminished or destroyed. He illustrated little to no interest in hobbies or other involvements that at one time he cared for greatly. ‘After the accident, Gage became a nasty, vulgar, irresponsible vagrant. His former employer, who regarded him as "the most efficient and capable foreman in their employ previous to his injury," refused to rehire him because he was so different.’ Q: It is suggested that Gage’s injury inspired the development of what at one time was a widely used medical procedure. What might this procedure be, and how does it relate to Gage’s injury? A: The frontal lobotomy. This has been used with the intention to diminish aggression and rage in mental patients, but generally results in drastic personality changes, and an inability to relate socially. This procedure is largely frowned upon today, with the development of neurological drugs as treatments. Frontal
Slide 34 - Resources Images: http://www.dalbsoutss.eq.edu.au/Sheepbrains_Me/human_brain.gif http://www.bioon.com/book/biology/whole/image/1/1-8.tif.jpg http://www.bioon.com/book/biology/whole/image/1/1-6.tif.jpg http://williamcalvin.com/BrainForAllSeasons/img/bonoboLH-humanLH-viaTWD.gif http://www.math.tu-dresden.de/~belov/brain/motorcor2.gif Larson, Gary. The Far Side. Phineas Gage: http://www.sruweb.com/~walsh/gage5.jpg http://soma.npa.uiuc.edu/courses/bio303/Image7.jpg http://en.wikipedia.org/wiki/Phineas_Gage http://science-education.nih.gov/nihHTML/ose/snapshots/multimedia/ritn/Gage/Broken_brain1.html
Slide 35 - Suggested Supplementary Materials: Skeleton Outline for note-taking. Multiple Diagrams of the Human Brain. * Students will label features/lobes * Students will color-code cortical regions 3. Worksheets (matching, short answer, etc.), centered around the functions of the lobes and regions of the cerebrum. 4. A more in depth article on Phineas Gage. Read and discuss as a class - time permitting. Suggested Assessments: Class/individual questioning throughout (especially at the conclusion of) the presentation. Homework worksheets - discussed or collected in class. Students will take a test on the nervous system in which they will be responsible for the structures, lobes, regions, functions, etc.
Slide 36 - Broad Concept: There is a relationship between structure and function in organ systems of humans. 4.1 Explain how major organ systems in humans (e.g., kidney, muscle, lung) have functional units (e.g., nephron, sarcome, alveoli) with specific anatomy that perform the function of that organ system. 4.2 Describe how the function of individual systems within humans are integrated to maintain a homeostatic balance in the body. * Note: This PowerPoint has been developed for Juniors and Seniors enrolled in Anatomy and Physiology Courses. Thus, the detail of the concepts and information contained herein is far greater than required by the state Biology standards listed above. Massachusetts State Biology Standards
Slide 37 - National Standards: THE BEHAVIOR OF ORGANISMS: Multicellular animals have nervous systems that generate behavior. Nervous systems are formed from specialized cells that conduct signals rapidly through the long cell extensions that make up nerves. The nerve cells communicate with each other by secreting specific excitatory and inhibitory molecules. In sense organs, specialized cells detect light, sound, and specific chemicals and enable animals to monitor what is going on in the world around them. Organisms have behavioral responses to internal changes and to external stimuli. Responses to external stimuli can result from interactions with the organism's own species and others, as well as environmental changes; these responses either can be innate or learned. The broad patterns of behavior exhibited by animals have evolved to ensure reproductive success. Animals often live in unpredictable environments, and so their behavior must be flexible enough to deal with uncertainty and change. Plants also respond to stimuli. Like other aspects of an organism's biology, behaviors have evolved through natural selection. Behaviors often have an adaptive logic when viewed in terms of evolutionary principles. Behavioral biology has implications for humans, as it provides links to psychology, sociology, and anthropology.
 

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