VIEWS: 8 PAGES: 18 POSTED ON: 8/27/2011
Fissures (deep grooves) divide the cerebrum into lobes Frontal lobe Parietal lobe Somatosensory Frontal association association Taste area area Reading Hearing Visual Speech association area Auditory Smell association area Vision Temporal lobe Occipital lobe If Christopher is in a car accident and due to brain damage loses his sight, which lobe of the brain were probably damaged? When you go to the refrigerator and reach for a carton of milk, which lobes of the brain are you using? When you are listening to music on earphones, which lobe of the brain are you using? When an Olympic gymnast does a flip on the balance beam, which lobes of the brain is she using? Regions of the Brain Cerebral hemispheres Brain stem Diencephalon Cerebellum Surface is made of ridges (gyri) and grooves (sulci) purpose: to increase surface area Figure 7.12b Specialized Areas of the Cerebrum Somatic sensory area – receives impulses from areas of the cerebrum Interpretation the body’s sensory to Broca’s area – involved in our ability receptors (audio, visual, olfactory, and Speech/language region speak taste) Figure 7.13c Motor Areas of the Cerebral Cortex Primary motor area – sends impulses to skeletal muscles Figure 7.14 Layers of the Cerebrum Gray matter › Outer layer › Composed mostly of neuron cell bodies White matter › Fiber tracts inside the gray matter › Example: corpus callosum connects hemispheres Figure 7.13a Diencephalon Sits on top of the brain stem Enclosed by the cerebral hemispheres •Thalamus •Hypothalamus •Epithalamus Thalamus Surrounds the third ventricle The relay station for sensory impulses Transfers impulses to the correct part of the cortex for localization and interpretation Hypothalamus Under the thalamus Important autonomic nervous system center › Helps regulate body temperature › Controls water balance › Regulates metabolism An important part of the limbic system (emotions) The pituitary gland is attached to the hypothalamus Epithalamus Forms the roof of the third ventricle Houses the pineal body (an endocrine gland) Includes the choroid plexus – forms cerebrospinal fluid Brain Stem Attaches to the spinal cord Parts of the brain stem › Midbrain › Pons › Medulla oblongata Midbrain Mostly composed of tracts of nerve fibers Has two bulging fiber tracts – cerebral peduncles Has four rounded protrusions – corpora quadrigemina › Reflex centers for vision and hearing Pons The bulging center part of the brain stem Mostly composed of fiber tracts Includes nuclei involved in the control of breathing Medulla Oblongata The lowest part of the brain stem Merges into the spinal cord Contains important control centers › Heart rate control › Blood pressure regulation › Breathing › Swallowing › Vomiting
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