Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Textbook Question
Chapter 13, Problem 29CYU
Which of the pathways illustrated here (ascending and descending} do not decussate?
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Applying a pressure stimulus to the fluid-filled capsule of an isolated Pacinian corpuscle causes a brief burst of action potentials in the afferent neuron, which ceases until the pressure is removed, at which time another brief burst of action potentials occurs. If an experimenter removes the capsule and applies pressure directly to the afferent neuron ending, action potentials are continuously fired during the stimulus. Explain these results in the context ofadaptation.
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Chapter 13 Solutions
Human Anatomy
Ch. 13 - Prob. 1CYUCh. 13 - Prob. 2CYUCh. 13 - Name the structure that connects the third...Ch. 13 - Prob. 4CYUCh. 13 - In which part of the brain stem are each of the...Ch. 13 - What are the corpora quadrigemina?Ch. 13 - Name the structure that connects the two...Ch. 13 - What type of sensory information does the...Ch. 13 - Name the three white fiber tracts that connect the...Ch. 13 - Prob. 10CYU
Ch. 13 - What part of the diencephalon functions as the...Ch. 13 - What is the difference in function between a...Ch. 13 - Which functional area of the cerebral cortex plans...Ch. 13 - Define contralateral projection.Ch. 13 - What deficits may result from injury to the...Ch. 13 - Prob. 16CYUCh. 13 - Where is the caudate nucleus located in reference...Ch. 13 - From where do the reticular nuclei receive input?...Ch. 13 - What emotional response does the amygdaloid body...Ch. 13 - Name the dura mater extension that lies in the...Ch. 13 - Where is cerebrospinal fluid produced? How is it...Ch. 13 - What neural structures pass through the vertebraI...Ch. 13 - Which portion of the spinal cord, gray matter or...Ch. 13 - Prob. 24CYUCh. 13 - Which two meninges border the space that is filled...Ch. 13 - Which sensory pathway carries discriminative touch...Ch. 13 - Of the sensory pathways described, which pass...Ch. 13 - Which descending fiber tract originates from the...Ch. 13 - Which of the pathways illustrated here (ascending...Ch. 13 - Individuals who have suffered a stroke generally...Ch. 13 - Prob. 31CYUCh. 13 - Choose the correct brain structure from the key...Ch. 13 - A patient suffered a cerebral hemorrhage that...Ch. 13 - Destruction of the ventral horn cells of the...Ch. 13 - For each of the following brain structures, write...Ch. 13 - Which of the following areas is most likely to...Ch. 13 - Kimberly learned that the basic design of the CNS...Ch. 13 - When Ralph had brain surgery to remove a small...Ch. 13 - When their second child was born, Kiko and Taka...Ch. 13 - Cesar, a brilliant computer analyst, was hit on...Ch. 13 - One war veteran was tetraplegic, and another was...Ch. 13 - Every time Spike went to a boxing match, he...Ch. 13 - A spinal cord injury at C2 results not only in...Ch. 13 - What parts of the brain are still developing...Ch. 13 - Strokes, tumors, or wounds can destroy limited...
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- If a person has a motor disorder and cannot move their aim voluntarily, but their muscles have tone, which motor neuron—upper or lower—is probably affected? Explain why.arrow_forwardExplain the difference between the relative and absolute refractory periods. Briefly describe the cellular events responsible for the refractory period. (Hint: Discuss the mechanism of repolarization).arrow_forwardSuppose that a sensory neuron in the periphery generates a trainof action potentials, and synaptically excites an interneuronin the CNS. What does this signal mean? What additionalinformation does the interneuron need in order to decode themessage?arrow_forward
- 2. a) sensation). the doctor decides to check the resting potential of her sensory nerves. The microelectrode is inserted and the intracellular potential is measured as -65 mv. What relative ionic concentrations are responsible for maintaining this membrane potential? A 47-year-old woman complains of paresthesis (tingling, pricking or burning a) [Na+ Jout > [Na+] in ; [K+]out > [K+]in b) [Na+ Jout > [Na+] in ; [K+]out [Ca2+]in d) [Na+ Jout [K+]in e) Active sodium potassium pumparrow_forwardCell bodies of UMN that synapse on LMN lie in all of these areas EXCEPT a) Medulla b) Thalamus c) Pre-motor cortex Pons d) Primary motor cortexarrow_forwardTwo separate post-synaptic interneurons receive synaptic potentials from afferent neurons in the periphery. The dendrites of one these interneurons receive an excitatory post-synaptic potential (EPSP) and an inhibitory post-synaptic potential (IPSP) of equal magnitude at the same time. The dendrites of the other interneuron receive one excitatory post-synaptic potential that is the same sized as the EPSP and IPSP received by the other interneuronarrow_forward
- Characterize each receptor activity described below by choosing the appropriate letter and number(s) from keys A and B.arrow_forwardAn in-class test of the opponent process theory of color vision relied on a basic principle of neurophysiology to explain color afterimages. What is this basic principle? O If a cell is excited or inhibited for a long period of time by a strong stimulus, when the stimulus is terminated the cell will temporarily "undershoot" or "overshoot" its normal activity rate. Receptor cells are able to respond to a wide variety of sensory inputs, but sensory neurons are only able to respond to a select few types of inputs. Sensory receptors are the first cells to process incoming stimuli, while sensory neurons have to rely on input from receptors in order to function. Retinal ganglion cells act in a non-intuitive "opposite" fashion, being inhibited by a strong stimulus, but excited by a weak stimulus.arrow_forwardWhich type of neuron, based on its shape, is bestsuited for relaying information directly from one neuron toanother? Explain why.arrow_forward
- Which of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.arrow_forwardWhat is the threshold potential?arrow_forwardTrace the pathway of the action potential to the tastearea of the cerebral cortex.arrow_forward
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