All of the structures of the CNS originate from the |
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neural tube |
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Which of the following is not one of the three basic regions of the cerebral hemisphere |
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The blood- and oxygen-rich red zone
Each cerebral hemisphere has three basic regions: a superficial cortex of gray matter, internal white matter, and the basal nuclei. |
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Choose the true statement regarding pyramidal cells |
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They allow us to control our skeletal muscles
The primary (somatic) motor cortex is located in the precentral gyrus of the frontal lobe of each hemisphere. Large neurons, called pyramidal cells, in these gyri allow us to consciously control the precise or skilled voluntary movements of our skeletal muscles. |
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What is the main role of the olfactory cortex |
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detection of odors |
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Spatial discrimination is the ability to identify the specific region of the body being stimulated |
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true |
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Which of the following is true of the multimodal association cortex |
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It allows us to tie information that we receive to previous experience and knowledge, and helps us decide what action to take.
The multimodal association cortex allows us to give meaning to the information that we receive, store it in memory if needed, tie it to previous experience and knowledge, and decide what action to take. |
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__________ is a division of labor in which each hemisphere has unique abilities not shared by its partner |
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Lateralization |
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___________ is responsible for communication between cerebral areas and between the cerebral cortex and lower CNS centers |
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The cerebral white matter |
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Which of the following is not a part of the diencephalon |
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Perithalamus |
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Which of the following areas regulates body temperature, food intake, and sleep-wake cycles |
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Hypothalamus |
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Which of the following is not one of the major regions of the brain stem |
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Cerebellum
From superior to inferior, the brain stem regions are midbrain, pons, and medulla oblongata. |
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Which of the following regions acts as an autonomic reflex center of the brain |
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Medulla oblongata
The small size of the medulla oblongata belies its crucial role as an autonomic reflex center involved in maintaining body homeostasis. Important visceral motor nuclei found in the medulla include the following:
- Cardiovascular center, which adjusts the force and rate of heart contraction to meet the body's needs, and changes blood vessel diameter to regulate blood pressure;
- Respiratory center, which generates the respiratory rhythm and helps to control the rate and depth of breathing;
- Various other centers, regulating activities such as vomiting, hiccupping, swallowing, coughing, and sneezing.
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_________ is a homeostatic brain imbalance that causes a temporary cessation of breathing during sleep. |
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Sleep apnea |
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Which of the following meninges forms the loose, mid-layer brain covering |
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Arachnoid matter |
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Which of the following is a protective mechanism that helps maintain a stable environment for the brain |
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Blood-brain barrier
The blood-brain barrier is a protective mechanism that helps maintain a stable environment for the brain |
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Which of the following is a progressive degenerative disease of the brain that ultimately results in dementia |
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Alzheimer's disease
Alzheimer's disease is a progressive degenerative disease of the brain that ultimately results in dementia |
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Choose the true statement regarding second-order neurons |
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Second-order neuron cell bodies reside in the dorsal horn of the spinal cord
Second-order neuron cell bodies reside in the dorsal horn of the spinal cord or in the medullary nuclei, and they transmit impulses to the thalamus or to the cerebellum where they synapse |
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First Order neurons |
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cell bodies reside in ganglion, conduct impuses from the cutaneous receptors of the skin and from porprioceptors to the spinal cord or brain stem, where they synapse with second order neurons. |
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Third order neurons |
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have cell bodies in the thalamus. they relay impulsesto the somatosensory cortex of the cerebrum.
(NO THIRD ORDER NEURONS IN THE CEREBELLUM) |
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Which of the following conditions results from viral destruction of ventral horn motor neurons |
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Poliomyelitis
Poliomyelitis results from destruction of ventral horn motor neurons by the poliovirus. Early symptoms include fever, headache, muscle pain and weakness, and loss of some somatic reflexes. Later, paralysis develops and the muscles served atrophy. |
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Cerebral palsy may be caused by a temporary lack of oxygen during birth |
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True
In difficult deliveries, a temporary lack of oxygen may lead to cerebral palsy |
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Anencephaly is a result of incomplete formation of the vertebral arches, and can be caused by inadequate folic acid in the maternal diet |
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False
Spina bifida is a result of incomplete formation of the vertebral arches, and can be caused by inadequate amounts of the B vitamin folic acid in the maternal diet |
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In which of the following areas does sorting and editing of impulses take place |
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Thalamic nuclei
Within the thalamus a sorting-out and information editing process occurs. Virtually all inputs ascending to the cerebral cortex funnel through the thalamic nuclei. |
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Which of the following is a function of the pons |
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Contains nuclei that relay information from the cerebrum to cerebellum
The pons is a "bridge" carrying info to/from the cerebellum |
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Which of the following areas is NOT involved in speech processing |
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Superior colliculi
The superior colliculi function in visual reflexes |
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Which of the following areas of the brain is involved in maintaining the body's homeostasis |
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Hypothalamus
The hypothalamus is the main visceral control center in the body and important to overall body homeostasis. Few tissues in the body escape its influence |
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Which of the following centers is NOT located in the hypothalamus |
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Center for central balance
The center for central balance is in the cerebellum |
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Which of the following coordinate head and eye movements when we visually follow a moving object |
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Superior colliculi
The superior colliculi are visual reflex centers that coordinate head and eye movements when we visually follow a moving object |
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Which of the following is a function of the basal ganglia |
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Starting, stopping, and monitoring arm swinging and gait
Starting, stopping, and monitoring arm swinging and gait are functions of the basal ganglia |
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Which of the following is NOT one of the basal nuclei |
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Corpus callosum
The corpus callosum is the largest commissure in the cerebral cortex and is composed of white matter |
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Which of the following is the autonomic control center |
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Hypothalamus
The hypothalamus is the control center for the autonomic nervous system |
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Which type of brain waves are seen when a person is concentrating on solving a problem |
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Beta waves
Beta waves are recorded when we are awake and alert |
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Which part of the brain is involved in thirst sensations |
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Hypothalamus
Osmoreceptors in the hypothalamus are activated when body fluid is too concentrated. This also stimulates the thirst receptors, which are also located in the hypothalamus |
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Which part of the brain produces dopamine |
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Substantia nigra
The substantia nigra gets its name from its high content of melanin, which is a precursor of dopamine |
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Which of the following statements concerning epilepsy is INCORRECT |
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It is associated with intellectual impairment.
Epilepsy is not associated with, nor does it cause, intellectual impairments |
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Which of the following is the central layer of the meninges |
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Arachnoid mater
The arachnoid mater is the middle layer |
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The average weight of the adult brain is |
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3-3.5 lb
The average weight of the adult brain is 3-3.5 lb |
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The CNS can be differentiated in the developing embryo by week |
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four.
The CNS can be differentiated in the developing embryo by week four |
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Which of the following landmarks separates the cerebral hemispheres |
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The longitudinal fissure
The transverse cerebral fissure separates the cerebrum from the cerebellum |
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The cerebral cortex has all the following features, except that |
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it is composed of white mater |
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The visceral sensory area of the cerebral cortex is involved in the conscious perception of all the following, except: |
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taste
The visceral sensory area of the cerebral cortex processes the feeling that your lungs will burst when you hold Your breathe. |
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In which part of the cerebral cortex do sensations, emotions, and thoughts come together and make us who we are |
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The multimodal associate areas
It is now thought that the multimodal areas of the cerebral cortex are where sensations, emotions, and thoughts come together and make us who we are |
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Which part of the cerebellum is involved in planning, rather that executing, movement |
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The lateral part of each hemisphere
The lateral part of each hemisphere of the cerebellum is involved in planning, rather that executing, movement. |
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All the following are attributed to the function of the amygdale, except |
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resolving mental conflict.
Resolving mental conflict is a function of the cingulated gyrus |
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The sensory hallucinations experienced by epileptic patients are known as |
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the aura.
A petit mal is the old term used for an absence seizure |
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Which of the following statements about language is INCORRECT |
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All the associated areas on the right side of the cerebral cortex are involved in language |
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Working memory |
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is limited to seven or eight chunks of information.
Working memory, also known as short-term memory, is limited to seven or eight chunks of information |
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Which of the following neurotransmitters is thought to prime the prefrontal cortex and the medial temporal lobes to form memories |
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Acetylcholine
Acetylcholine is thought to prime the prefrontal cortex and the medial temporal lobes to form memories |
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If you are having a conversation with a person, excuse yourself for five minutes, and come back and the person no longer knows you, the person would be suffering from |
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anterograde amnesia.
A person with epilepsy would suffer from seizures, but this would not affect their long- or short-term memory. |
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The main culprit in the damage caused by a cerebral vascular accident (CVA) is |
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glutamate.
Serotonin is not thought to play a role in the production of brain damage that results after a CVA |
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All of the following features can be seen in the brain tissue of patients suffering from Alzheimer's disease, except |
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increased levels of acetylcholine in the basal forebrain.
Tau is the protein involved in the neurofibrillary tangles seen in Alzheimer's patients |
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Deep brain stimulation via implanted electrodes has been used to treat some of the symptoms of |
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Parkinson's disease.
Deep brain stimulation via implanted electrodes has not been used to treat some of the symptoms of Alzheimer's disease. |
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Which of the following structures is not a part of the peripheral nervous system (PNS) |
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Brain
See page 485. The PNS includes all neural structures outside the brain and spinal cord |
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Mechanoreceptors |
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stretch |
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Thermoreceptors |
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temperature |
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Chemoreceptors |
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chemicals in solution |
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Photoreceptors |
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light energy |
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Nocioreceptors |
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pain |
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Proprioceptors are receptors that are classified by |
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their location.
See page 486. Sensory receptors are named based on the type of stimulus they recognize, their location, and their structural complexity. Proprioceptors are classified by their location. |
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Simple receptors found in epithelia and connective tissue tend to |
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uncapsulated dendritic endings |
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Which of the following has unencapsulated nerve endings |
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hair folicle receptors
is especially helpful. Hair follicle receptors, free nerve endings of sensory neurons, and tactile discs have unencapsulated nerve endings. All of the other receptors listed have encapsulated nerve endings. |
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The final level of neural integration in the somatosensory system is the ______ level |
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perceptual |
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Fast adapting receptors are called |
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phasic receptors
Many sensory receptors exhibit adaptation. Adaptation is a change in sensitivity (and nerve impulse generation) in response to a constant stimulus. Phasic receptors are fast adapting receptors. Tonic receptors provide a sustained response with little or no adaptation. Nociceptors and most proprioceptors are tonic receptors because of the protective nature of the information they convey |
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Most nerves are able to carry impulses both toward and away from the CNS |
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true |
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CNS nerve fibers are able to regenerate |
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false
Unlike peripheral nerve fibers, nerves of the CNS (brain and spinal cord) do not regenerate. Thus, damage to the brain or spinal cord is typically considered irreversible |
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A nerve that carries autonomic signals away from the CNS is classified as |
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visceral efferant
Visceral refers to autonomic nervous system fibers. Afferent means toward the CNS (sensory), while efferent means away from the CNS (motor). Thus, a nerve that carries autonomic signals away from the CNS would be classified as a visceral efferent nerve. |
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Choose the false statement about cranial nerves |
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The cranial nerves are associated with the spinal cord.
See page 493. The cranial nerves are associated with the brain, not the spinal cord. All of the other statements are true. |
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The first two pairs of cranial nerves attach to the |
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forebrain |
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All spinal nerves are mixed nerves. |
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true |
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If the phrenic nerve were severed, what would be the most immediate effect |
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breathing would stop
The phrenic nerve serves the diaphragm. If this nerve is irritated, then hiccups result. If this nerve is crushed or damaged, the diaphragm becomes paralyzed and independent breathing ceases. |
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The pinching motion (with opposed thumb and forefinger) is highly dependent upon impulses transmitted by the: |
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median nerve |
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Which of the following is false regarding the sciatic nerve |
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The sciatic nerve is a single nerve |
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The first level of motor control is the |
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segmental level |
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Which structure is involved in the projection level of motor control |
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primary motor cortex |
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In a reflex arc, the ___ transmits afferent impulses to the CNS |
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sensory neuron |
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The flexor reflex is initiated by painful stimuli |
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true |
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