WHS AP Psych 1
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| Nervous system | the body's speedy, electrochemical communication network, consisting of all the nerve cells of the peripheral and central nervous systems.
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| Central Nervous System | the brain and spinal cord.
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| Peripheral Nervous System | the sensory and motor neurons that connect the central nervous system (CNS) to the rest of the body.
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| Nerves | bundled axons that form neural cables connecting the central nervous system with muscles, glands, and sense organs.
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| Sensory/Afferent neurons | neurons that carry incoming information from the body's tissues and sensory receptors to the brain and spinal cord.
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| Motor/Efferent neurons | neurons that carry outgoing information from the brain and spinal cord to the muscles and glands.
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| Interneurons | neurons within the brain and spinal cord; they communicate internally and process information between the sensory inputs and motor outputs.
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| Somatic nervous system | the division of the peripheral nervous system that controls the body's skeletal muscles. Also called the skeletal nervous system
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| Autonomic Nervous system | the part of the peripheral nervous system that controls the glands and the muscles of the internal organs (such as the heart). Its sympathetic division arouses; its parasympathetic division calms.
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| Sympathetic nervous system | the division of the autonomic nervous system that arouses the body, mobilizing its energy.
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| parasympathetic nervous system | the division of the autonomic nervous system that arouses the body, mobilizing its energy.
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| Reflex | a simple, automatic response to a sensory stimulus, such as the knee-jerk response.
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| Endocrine system | the body's "slow" chemical communication system; a set of glands that secrete hormones into the bloodstream
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| Hormones | chemical messengers that are manufactured by the endocrine glands, travel through the bloodstream, and affect other tissues.
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| Adrenal glands | a pair of endocrine glands that sit just above the kidneys and secrete hormones (epinephrine and norepinephrine) that help arouse the body in times of stress.
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| Pituitary gland | the endocrine system's most influential gland. Under the influence of the hypothalamus, the pituitary regulates growth and controls other endocrine glands.
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| Lesion | tissue destruction. A brain lesion is a naturally or experimentally caused destruction of brain tissue.
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| EEG (electroencephalogram) | an amplified recording of the waves of electrical activity sweeping across the brain's surface. These waves are measured by electrodes placed on the scalp.
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| MEG (magnetoencephalography) | a brain imaging technique that measures magnetic fields from the brain's natural electrical activity.
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| CT (computed tomography) scan | a series of X-ray photographs taken from different angles and combined by computer into a composite representation of a slice of the brain's structure. (Also called CAT scan.)
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| PET (positron emission tomography) scan | a visual display of brain activity that detects where a radioactive form of glucose goes while the brain performs a given task.
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| MRI (magnetic resonance imaging) | a technique that uses magnetic fields and radio waves to produce computer-generated images of soft tissue. MRI scans show brain anatomy.
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| fMRI (functional MRI) | a technique for revealing bloodflow and, therefore, brain activity by comparing successive MRI scans. fMRI scans show brain function as well as structure.
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| brainstem | the oldest part and central core of the brain, beginning where the spinal cord swells as it enters the skull; the brainstem is responsible for automatic survival functions.
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| medulla | the base of the brainstem; controls heartbeat and breathing.
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| Thalamus | the brain's sensory control center, located on top of the brainstem; it directs messages to the sensory receiving areas in the cortex and transmits replies to the cerebellum and medulla.
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| reticular formation | a nerve network that travels through the brainstem into the thalamus and plays an important role in controlling arousal.
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| cerebellum | the "little brain" at the rear of the brainstem; functions include processing sensory input, coordinating movement output and balance, and enabling nonverbal learning and memory.
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| limbic system | neural system (including the amygdala, hypothalamus, and hippocampus) located below the cerebral hemispheres; associated with emotions and drives.
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| amygdala | two lima-bean-sized neural clusters in the limbic system; linked to emotion.
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| hypothalamus | a neural structure lying below (hypo) the thalamus; it directs several maintenance activities (eating, drinking, body temperature), helps govern the endocrine system via the pituitary gland, and is linked to emotion and reward.
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| hippocampus | a neural center located in the limbic system; helps process for storage explicit (conscious) memories of facts and events.
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| cerebral cortex | the intricate fabric of interconnected neural cells covering the cerebral hemispheres; the body's ultimate control and information-processing center.
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| Frontal lobes | the portion of the cerebral cortex lying just behind the forehead; involved in speaking and muscle movements and in making plans and judgments.
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| parietal lobes | the portion of the cerebral cortex lying at the top of the head and toward the rear; receives sensory input for touch and body position.
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| occipital lobes | the portion of the cerebral cortex lying at the back of the head; includes areas that receive information from the visual fields.
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| temporal lobes | the portion of the cerebral cortex lying roughly above the ears; includes the auditory areas, each receiving information primarily from the opposite ear.
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| motor cortex | an area at the rear of the frontal lobes that controls voluntary movements.
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| somatosensory cortex | an area at the front of the parietal lobes that registers and processes body touch and movement sensations.
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| association areas | areas of the cerebral cortex that are not involved in primary motor or sensory functions; rather, they are involved in higher mental functions such as learning, remembering, thinking, and speaking.
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| plasticity | the brain's ability to change, especially during childhood, by reorganizing after damage or by building new pathways based on experience.
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| neurogenesis | the formation of new neurons.
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