a long, thin, tubular bundle of nervous tissue and support cells that extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column
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cerebellum
a major feature of the hindbrain responsible for body movements and balance
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cerebrum
the principal and most anterior part of the brain in vertebrates, located in the front area of the skull and consisting of two hemispheres, left and right, separated by a fissure
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midbrain
relays sensory and motor impulses; serves important functions in motor movement, particularly movements of the eye, and in auditory and visual processing.
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pons
part of the brain stem, assists with regulation of breathing
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medulla oblongata
part of brain stem, regulates heart rate, blood pressure, and breathing, and controls the reflexes of coughing, sneezing, and vomiting
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hypothalamus
lower portion of diencephalon which acts as an autonomic center regulating metabolism, heart rate, blood pressure, thirst, hunger, energy level, and body temperature
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thalamus
middle portion of diencephalon which relays sensory impulses up to the sensory cortex (aka the cerebrum); regulates sleep and consciousness
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corpus callosum
a thick band of nerve fibers that divides the cerebral cortex lobes into left and right hemispheres and acts as the connection between the two.
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meninges
three layers of protective tissue between the brain and skull
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frontal lobe
cerebrum lobe responsible for memory, intelligence, behavior, emotions, motor function, and smell
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occipital lobe
cerebrum lobe responsible for vision and speech
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parietal lobe
lobe responsible for somatic sensations (pain, touch, temperature perception), and speech
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temporal lobe
lobe responsible for hearing, smell, memory, speech, and emotion
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brain stem
Portion of brain that contains the pons, medulla oblongata, and the beginning of the spinal cord, controls the flow of messages between the brain and the rest of the body, and it also controls basic body functions
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Broca's area
area on left frontal lobe responsible for tongue and lip movements
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primary motor cortex
area in frontal lobe responsible for sending impulses to muscles
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primary somatic sensory cortex
area in parietal lobe responsible for interpreting sensory impulses from the body
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dura mater
outermost meninges layer
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sensory input
also known as the afferent pathway; the gathering information about changes in the environment
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motor output
also known as the efferent pathway; the response sent from the CNS to the rest of the body
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CNS
composed of brain and spinal cord
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autonomic NS
involuntary control of cardiac and smooth muscles
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Somatic NS
voluntary control of skeletal muscles
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parasympathetic
part of autonomic N.S. responsible for "rest and digest" actions
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sympathetic NS
part of the autonomic N.S. responsible for response to potential danger
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neuroglia
neuron supporting cells of the nervous system
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Astrocytes
neuroglia that protects neurons from harmful substances in the blood
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ependymal
neuroglia that form a protective covering around the spinal cord and cavities of the brain
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oligodendrocytes
neuroglia that produce myelin sheaths around nerve fibers in the CNS
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Schwann cells
neuroglia that produce myelin sheaths around nerve fibers in the PNS
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dendrites
conduct impulses toward the cell body of a neuron
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axons
conduct impulses away from the cell body of a neuron
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myelin sheath
insulating material on axon fibers that increase the rate of impulse transmission
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neurotransmitter
a chemical messanger that sends a message from the axon terminals to a muscle or nearby neuron
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synaptic cleft
a gap between axon terminals and nearby muscles or neurons
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Nodes of Ranvier
areas on an axon without a myelin sheath; also known as gray matter
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action potential
another name for a nerve impulse
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depolarization
the inflow of sodium ions resulting in a more positive environment inside the neuron and the propagation of an action potential.
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repolarization
the outflow of potassium ions resulting in the return of a more positive environment outside the neuron.
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fissure
a deep grove in the brain
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describe the major functions of the medulla...
carries out and regulates life sustaining functions that are done involuntarily (without thinking).
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temporal lobe
responsible for processing auditory information from the ears
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parietal lobe
processes sensory things that have to do with temperature, touch, and taste
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frontal lobe
carries out higher mental processes such as thinking, decision making, and planning. (This is where our personality is formed
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occipital lobe
responsible for processing visual information from the eyes. It helps you correctly understand what you are seeing
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describe the major functions of the cerebral cortex
the cerebral cortex is where the four lobes are located
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the cerebrum cortex is...
associated with higher brain function such as thought and action
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what is a thalamus gland?
the thalamus serves as a relay station for impulses traveling to and from the spinal cord, brain stem, cerebellum, and cerebrum
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describe the major functions of the cerebellum...
responsible for balance and coordination of muscles and the body. It is extremely important for being able to preform everyday voluntary things
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Nervous system
Major communication system in the body. Functions in sensing, processing, communicating between the cells throughout the entire body
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Central Nervous system
Consists of the brain and spinal cord
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Peripheral nervous system
Consists of cranial and spinal nerves
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Afferent pathway
Input. Away from the periphery to the CNS. Brain functions as the integrator. Includes somatic, special, and visceral senses
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Efferent pathway
Output. Leaves the CNS and travels to the periphery. Includes somatic and automatic nervous systems and sympathetic and parasympathetic pathways
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Neurons
Interconnect and communicate with each other. From the brain to spinal, to peripheral nerves, to the effector organs to allow us to react to our surroundings. Use electrical and chemical signals
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Ventricles
Cavities filled with CSF, lined with ependymal cells
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CSF
Secreted from support cells. Support the brain, regulate cell environment. Circulates through ventricular system. Produced by ependymal cells, supports/cushions against trauma, regulates environment of the brain
Immune function (phagocytize bacteria and debris, release cytokines)
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Oligodendrocytes
Myelinate central nerves multiple nerves at a time
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Myelin
Protect axon from outside ions. Act like electrical tape. Made from schwann cells in the periphery and oligodendrocytes in the CNS
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Ependymal cells
Secrete CSF, ions, proteins, etc. Line the ventricles
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Dura mater
Thick/tough leathery sponge beneath the skull
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Cerebrum
Most of the brain function. Higher level cognitive functions. Sensory integration, movement initiation, memory, emotion, consciousness
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Brain stem
Autonomic funtions. Cardiovascular, respiratory control
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Dendrites
Inpput- receive incoming signals. Multiple, short
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Axons
Output- send signal "away." Single, long (up to 1M). Uniform diameter, often myelinated
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Cerebrum Lobes
Four major lobes. Frontal, parietal, occipital, temportal
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Occipital lobe
Primary visual cortex (sight)
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Temporal lobe
Primary auditory cortex (hearing)
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Frontal lobe
Primary motor cortex (voluntary movement)
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Gyri
Bumps
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Sulci
Grooves
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Optic nerve
Vision
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Thalamus
Relay center to/from cortex. All sensory information first stops at thalamus before proceeding to cortex. Multiple sub-nuclei "integrate" incoming sensory signals.
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Hypothalamus
Maintains homeostasis by regulating metabolic processes (temperature, hunger, thirst, etc.)
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Cerebellum
Coordinates motor output and regulates muscle tone. Compares intended movement coming from the motor cortex with actual movement sensation coming from the joints and muscles and makes corrections. Based on past experiences
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Medulla Oblongata
Contains autonomic nuclei that control fundamental life processes required for human life. Respiration, heart rate, etc.