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Brain Anatomy
Term | Definition |
---|---|
cerebral cortex | outermost part of the brain that can be divided into 4 lobes; responsible for ability to think, reason, and imagine |
four lobes | frontal: reasoning, motor skills, higher level cognition, expressive language; parietal: processes senses; occipital: interprets visual stimuli and information; and temporal: interprets sounds and language, hippocampus forms memories |
brain stem | hindbrain & midbrain; hindbrain connects spinal cord to brain; medulla: above spinal cord, controls hr, breathing, & bp; pons connects medulla to cerebellum & controls mvmnt; reticular formation: neural network in medulla, controls functions like sleep & |
midbrain | smallest region of brain, relay station for auditory & visual info, controls visual & auditory systems and eye movement, red nucleus and substantia nigra control body movement, |
cerebellum | "little brain", on top of pons behind brain stem, gets info from balance system of inner ear, sensory nerves, and auditory & visual systems; motor movements, memory and learning; 10% of brain's size; 50% of brain's neurons; posture, balance, coordination |
thalamus | above brain stem, transmits movement and sensory info, relays info to cerebral cortex, also gets info from cerebral cortex to send to other systems |
hypothalamus | grouping of nuclei at base of brain near pituitary gland, controls hunger, thirst, emotions, body temp, and circadian rhythms; controls pituitary gland by secreting hormones |
limbic system | amygdala, hippocampus, regions of limbic cortex and septal area; these 4 structures form connections between limbic system and hypothalamus, and the thalamus and cerebral cortex; system itself controls emotional responses |
basal ganglia | group of large nuclei that partially surround the thalamus; important in control of movement; red nucleus and substantia nigra of midbrain have connections to basal ganglia |