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zoo ch13 pt 4
brain and cranial nerves
| Question | Answer |
|---|---|
| central sulcus | separates frontal from parietal lobes |
| lateral sulcus | separates frontal from temporal lobes |
| parieto-occipital sulcus | separates parietal from occipital lobes |
| precentral gyrus | contains primary motor cortex |
| postcentral gyrus | contains primary sensory (general somatic senses) cortex |
| primary sensory cortex | (postcentral gyrus): receives general somatic sensory information (pain, touch, pressure, vibration, temperature sensations) |
| primary visual cortex | receives information from the lateral geniculate nuclei |
| gustatory cortex | receives information from taste receptors |
| sensory association areas | : stores memories of previous sensory experiences, to compare with current sensations |
| somatic sensory association area | enables us to identify things we touch |
| primary motor area | (precentral gyrus) sends voluntary commands to skeletal muscles |
| somatic motor association area | stores learned motor behaviors (except speech) |
| general interpretation area | (Wernicke area): responsible for recognition of spoken and written language (usually found in left hemisphere) |
| speech center | (Broca area, motor speech area): stores motor programs for speech (usually found in left hemisphere) |
| prefrontal cortex | predicts consequences of actions |
| frontal eye field | controls learned eye movements |
| association fibers | connect within same hemisphere |
| arcuate fibers | shortest association fibers |
| longitudinal fascicluli | longer fibers, connecting frontal to other lobes |
| commissural fibers | connect from one hemisphere to the other |
| corpus callosum | most important band of commissural fibers, allows communication and coordination between left and right cerebral hemispheres |
| anterior commissure | smaller tract of commissural fibers that provide another route for communication between the cerebral hemispheres. |
| projection fibers | connect between cerebrum and lower parts of brain or spinal cord |
| internal capsule | ascending and descending fibers look alike, entire mass |
| brain waves | electrical patterns observed on electroencephalogram (EEG) |
| beta waves | higher frequency waves present during mental activity or stress |
| alpha waves | found in healthy, awake adults who are resting with eyes closed |
| theta waves | may appear transiently during sleep in normal adults. Most often observed in children and intensely frustrated adults |
| delta waves | very-large-amplitude, low-frequency waves normally seen during deep sleep |