Medsci 142 Exam Study Guide Questions And Actual Answers.
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Course
Medsci 142
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Medsci 142
Afferent nerves conduct nerve impulses from: a) one effector to another. b) receptors to the central nervous system. c) the central nervous system to receptors. d) effectors to the central nervous system.e) the central nervous system to effectors. - Answer receptors to the central nervous system...
Medsci 142 Exam Study Guide
Questions And Actual Answers.
Afferent nerves conduct nerve impulses from: a) one effector to another. b) receptors to the central
nervous system. c) the central nervous system to receptors. d) effectors to the central nervous system.e)
the central nervous system to effectors. - Answer receptors to the central nervous system
The factor most affecting the rate of impulse conduction is the: a) length of the axon. b) rate of axonal
transport. c) number of neuroglia associated with it.d) presence or absence of a myelin sheath.e) site of
initial stimulation. - Answer The factor most affecting the rate of impulse conduction is the presence or
absence of a myelin sheath.
The posterior (dorsal) root ganglion is: a) the tapered end of the spinal cord. b) the roots of spinal nerves
hanging inferiorly from the inferior end of the spinal cord in the vertebral column. c) an extension of the
pia mater that anchors the spinal cord to the coccyx. d) an indentation on the dorsal side of the spinal
cord. e) where the cell bodies of sensory neurons are located. - Answer The posterior root ganglion is
where the cell bodies of sensory neurons are located.
The part of a spinal nerve that contains only efferent fibres is the: a) dorsal root. b) ventral root. c)
ventral ramus. d) dorsal ramus. e) plexus. - Answer The part of a spinal nerve that contains only
efferent fibres is the ventral root.
Cell bodies of motor neurons to skeletal muscles are located in the: a) posterior white columns. b)
anterior white columns. c) central canal. d) anterior gray horns. e) lateral gray horns. - Answer Cell
bodies of motor neurons to skeletal muscles are located in the anterior gray horns.
Fine control of body motor coordination and balance is a function of the: a) pituitary gland. b)
cerebellum. c) hypothalamus. d) thalamus. e) reticular activating system. - Answer Fine control of body
coordination and balance is a function of the cerebellum.
Paired masses of gray matter within the white matter of the cerebrum that are rich in dopamine and are
involved in maintenance of muscle tone are the: a) substantia nigra. b) supraoptic nuclei. c) basal
ganglia. d) pontine nuclei. e) mammillary bodies. - Answer Paired masses of gray matter within the
white matter of the cerebrum that are rich in dopamine and are involved in maintenance of muscle tone
are the basal ganglia.
,The main relay centre for conducting information between the spinal cord and the cerebrum is the: a)
thalamus.b) corpus callosum. c) cerebellar peduncles.d) tentorium cerebelli.e) insula. - Answer The
main relay center for conducting information between the spinal cord and the cerebrum is the thalamus.
The brain stem is made up of the: a) medulla oblongata, thalamus, and midbrain. b) midbrain,
hypothalamus, and thalamus. c) medulla oblongata, hypothalamus, and pons. d) medulla oblongata,
pons, and midbrain.e) cerebellum, pons, and hypothalamus. - Answer The brain stem is made up of the
medulla oblongata, pons, and midbrain.
Damage to the cerebellum would result in: a) altered pituitary function. b) inability to dream. c) loss of
memory. d) uncontrollable body temperature. e) uncoordinated movement. - Answer Damage to the
cerebellum would result in uncoordinated movement.
Question 11: The cerebral hemispheres are connected internally by the: a) corpus callosum. b) basal
ganglia.c) intermediate mass.d) arachnoid villi.e) pons. - Answer The cerebral hemispheres are
connected internally by the corpus callosum.
The primary motor area of the cerebral cortex is located in the: a) postcentral gyrus. b) precentral gyrus.
c) occipital lobe. d) temporal lobe. e) insula. - Answer The primary motor area of the cerebral cortex is
located in the precentral gyrus.
The primary visual area and visual association area of the cerebral cortex are both located in the: a)
temporal lobe. b) parietal lobe. c) occipital lobe. d) insula. e) frontal lobe. - Answer The primary visual
area and visual association area of the cerebral cortex are both located in the occipital lobe.
Precise location and identification of specific sensations occurs in the: a) cerebral cortex. b) brain stem. c)
thalamus. d) spinal cord. e) all of these options. - Answer Precise location and identification of specific
sensations occurs in the cerebral cortex.
Receptors for pressure that are widely distributed in the subcutaneous tissue and the submucosal tissues
are the: a) Ruffini corpuscles. b) Merkel discs. c) Meissner corpuscles.d) intrafusal muscle fibres. e) -
Answer Receptors for pressure that are widely distributed in the subcutaneous tissue and the
submucosal tissues are the Pacinian corpuscles.
,Injury to lower motor neurons results in: a) flaccid paralysis. b) long-term potentiation. c) coma. d)
kinesthesia. e) spastic paralysis. - Answer Injury to lower motor neurons results in flaccid paralysis.
The cell bodies of first-order neurons in the posterior column-medial lemniscus pathway to the cortex
are located in the: a) medial lemniscus. b) posterior root ganglia of spinal nerves. c) medulla. d)
precentral gyrus. e) anterior gray horns of the spinal cord. - Answer The cell bodies of first-order
neurons in the posterior column-medial lemniscus pathway to the cortex are located in the posterior
root ganglia of spinal nerves.
The medial lemniscus is a projection tract of second-order neurons extending from the: a) upper motor
neurons to the lower motor neurons. b) proprioceptors to the anterior gray horns of the spinal cord. c)
posterior root ganglia to the medulla. d) thalamus to the postcentral gyrus of the cerebral cortex.e)
medulla to the thalamus. - Answer The medial lemniscus is a projection tract of second-order neurons
extending from the medulla to the thalamus.
First-order sensory neurons conduct impulses from: a) the spinal cord to the brainstem.b) a receptor to
the CNS.c) one part of the spinal cord to another. d) the thalamus to the somatosensory cortex. e) the
CNS to an effector. - Answer First-order sensory neurons conduct impulses from a receptor to the CNS.
Cell bodies for upper motor neurons are located in the: a) cerebellum. b) thalamus. c) anterior gray
horns of the spinal cord. d) connective tissues surrounding skeletal muscles. e) precentral gyri of the
cerebral cortex. - Answer Cell bodies for upper motor neurons are located in the precentral gyri of the
cerebral cortex.
Third-order sensory neurons in the posterior column-medial lemniscus pathway extend from the: a)
medulla oblongata to the thalamus. b) spinal cord to the medulla oblongata. c) skin to posterior root
ganglia. d) thalamus to the somatosensory area of the cerebral cortex. e) posterior root ganglia to the
posterior gray horn of the spinal cord. - Answer Third-order sensory neurons in the posterior column-
medial lemniscus pathway extend from the thalamus to the somatosensory area of the cerebral cortex.
The parietal lobe of the brain contains: a) Wernicke's area b) Primary visual cortex c) Primary
somatosensory cortex d) Primary motor cortex e) Broca's area - Answer The parietal lobe of the brain
contains the primary somatosensory cortex.
Lower motor neurons are: a) located in the dorsal root ganglia b) located in the ventral horn of the spinal
cord c) responsible for conveying touch and pressure sensations to the spinal cord d) located in the
, motor cortexe) sensory neurons in the spinal cord - Answer Lower motor neurons are located in the
ventral horn of the spinal cord.
The lateral spinothalamic tract conveys: a) sensory impulses regarding discriminative touch b) sensory
impulses regarding two point discrimination c) sensory impulses regarding vibrationd) sensory impulses
regarding proprioception e) sensory impulses regarding pain - Answer The lateral spinothalamic tract
conveys sensory impulses regarding pain.
The medial lemniscus: a) contains mainly unmyelinated fibres b) conveys sensory information from the
thalamus to the sensory cortex c) conveys sensory information on pain and temperature only d) is
located in the brainsteme) is located in the spinal cord - Answer The medial lemniscus is located in the
brainstem.
The corticospinal (pyramidal) tract has all of the following characteristics, EXCEPT: a) where affected by a
disease results in a flaccid paralysis b) passes down the spinal cord as the lateral corticospinal tract c) is
involved in the voluntary control of muscles on the opposite side of the body d) arises from upper motor
neurons in the precentral gyrus e) contains mainly fast conducting myelinated fibres - Answer The
corticospinal (pyramidal) tract has all of the following characteristics, EXCEPT: where affected by a
disease results in a flaccid paralysis.
The basal ganglia consists of all of the following structures, EXCEPT: a) Putamen b) Substantia nigra c)
Caudate nucleus d) Globus pallidus e) Cerebellum - Answer The basal ganglia consists of all of the
following structures, EXCEPT: cerebellum.
The cells in the peripheral nerves which produce myelin are the: a) sensory neurons b) lower motor
neurons c) astrocytes d) Schwann cells e) oligodendrocytes - Answer The cells in the peripheral nerves
which produce myelin are the Schwann cells.
The fibres responsible for conveying discriminative touch and pressure sensations from the skin to the
spinal cord: a) are heavily myelinated fibres b) are slow conducting fibres c) enter the spinal cord via the
ventral root d) are associated with non-encapsulated receptors e) have their cell bodies in the dorsal
horn - Answer The fibres responsible for conveying discriminative touch and pressure sensations from
the skin to the spinal cord are heavily myelinated fibres.
The temporal lobe of the brain contains: a) Primary visual cortex b) Wernicke's area c) Broca's aread)
Primary motor cortex e) Primary somatosensory cortex - Answer The temporal lobe of the brain
contains Wernicke's area.
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