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Neuroanatomy: Somatosensory

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1 Neuro (Neuroanatomy) Quiz on Neuroanatomy: Somatosensory, created by Zoila Rojas on 22/03/2016.
Zoila Rojas
Quiz by Zoila Rojas, updated more than 1 year ago
Zoila Rojas
Created by Zoila Rojas about 8 years ago
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Resource summary

Question 1

Question
How many neurons are there in pathways that transmit conscious awareness of sensation?
Answer
  • 2
  • 1
  • 3
  • 4

Question 2

Question
The cell bodies of first order neurons for somatosensory pathways to the cerebrum are located in this...
Answer
  • dorsal horn
  • dorsal root ganglion
  • dorsal column nuclei
  • dorsal roots

Question 3

Question
The second order neurons of somatosensory pathways to the cerebrum always...
Answer
  • have axons that cross the midline
  • synapse contralateral to first order axon
  • synapse at level of closed medulla
  • have cell bodes in dorsal horn

Question 4

Question
The dorsal column medial lemniscal pathway...
Answer
  • conducts mechanosensation
  • has a single thalamic target
  • when injured causes deficits in two point discrimation
  • all of these are true

Question 5

Question
Mechanosensation from the right arm travels up the...
Answer
  • left fasciculus gracilis
  • left fasciculus cuneatus
  • right fasciculus cuneatus
  • right fasciculus gracilis

Question 6

Question
Mechanosensation from the sacral region travels...
Answer
  • up fasciculus gracilis where it synapses with second order neurons at nucleus gracilis and crosses via the anterior part of medial lemniscus
  • up fasciculus cuneatus where it synapses with second order neurons at nucleus cuneatus and crosses via the posterior part of medial lemniscus
  • up fasciculus gracilis where it synapses with second order neurons at nucleus cuneatus and crosses via the anterior part of medial lemniscus
  • up fasciculus gracilis where it synapses with second order neurons at nucleus fasciculus and crosses via the posterior part of medial lemniscus

Question 7

Question
Axons on the posterior most part of the right medial lemniscus in the closed medulla are...
Answer
  • carrying mechanosensation from left cervical and thoracic regions
  • carrying mechanosensation from right cervical and thoracic regions
  • carrying mechanosensation from right lumbar and sacral regions
  • carrying mechanosensation from left lumbar and sacral regions

Question 8

Question
The third order neurons of the dorsal column medial lemniscal pathway...
Answer
  • have cell bodies in VPM thalamus
  • enter the cerebral cortex via the superior cerebellar peduncle
  • terminate at lower 2/3rds of brodman's area 3, 1, and 2
  • none of these are true

Question 9

Question
Which of these is true about the anterior spinothalamic and dorsal column medial lemniscal pathway?
Answer
  • They both have a single termination at VPL thalamus
  • Their second order neurons are located on the dorsal horn of the spinal cord
  • For both pathwyas information on spinal cord is organized somatotopically with cervical information being more medial and sacral information more lateral
  • both of their first order neurons are located in the DRG

Question 10

Question
Pain fibers that travel via anterior spinothalamic tract...
Answer
  • have their first synapse in the dorsal horn in region called substantia gelatinosa
  • that are damaged may never recover when there is damage to anterior spinothalamic tract
  • travel much faster than mechanosensation in dorsal column medial leminscal pathway
  • none of these are true

Question 11

Question
Second order neurons in anterior spinothalamic tract...
Answer
  • cross the midline via the anterior white comissure
  • travel in the spinal cord at the spinothalamic tract
  • synapse directly with third order neurons in VPL thalamus
  • all of these are true

Question 12

Question
In what region does the antero-lateral fasciculus become the spinothalamic tract?
Answer
  • closed medulla
  • open medulla
  • pons at middle cerebellar peduncle
  • above level of T6

Question 13

Question
What is the caudal most level in which damage to both the dorsal column medial lemniscus and anterior spinothalamic pathways causes contralateral sensory deficits?
Answer
  • closed medulla
  • cervical level
  • thoracic level
  • open medulla

Question 14

Question
At the pontine level the mechanosensation from the cervical region is located
Answer
  • medially
  • anteriorly
  • posteriorly
  • laterally

Question 15

Question
At the level of the midbrain the mechanosensation of the sacral region in the medial lemniscus is most...
Answer
  • medial
  • lateral
  • anterior
  • posterior

Question 16

Question
Two important collateral targets at the midbrain for the spinothalamic tract are the...
Answer
  • deep layer of superior colliculus and central gray
  • deep layer of inferior colliculus and red nucleus
  • edinger westphal nucleus and trigeminal motor nucleus
  • none of these

Question 17

Question
Before the synapsing at the VPL thalamus, the 2nd order axons of both the dorsal column medial lemniscus and anterior spinothalamic pathways pass through this structure in the midbrain that is lateral to the red nucleus.
Answer
  • central gray
  • prerubral field
  • subthalamic nucleus
  • reticular formation

Question 18

Question
Which of these is not a termination of the spinothalamic tract in the brainstem?
Answer
  • central gray
  • hypothalamus
  • medial part of thalamus
  • red nucleus

Question 19

Question
The information that is sent in the axons that are traveling within fasciculus gracilis will most likely have their terminations in what region of the cerebral cortex?
Answer
  • post central gyrus near the vertex
  • post central gyrus adjacent to the temporal lobe
  • post central gyrus between the vertex and area adjacent to temporal lobe
  • post central gyrus slightly below the vertex

Question 20

Question
All primary afferents of the trigeminal nerve have their cell bodies in the trigeminal (semilunar) ganglion.
Answer
  • True
  • False

Question 21

Question
Which part of the trigeminal nuclei runs between the pons and midbrain?
Answer
  • mesencephalic nucleus of V
  • trigeminal ganglion
  • principal sensory nucleus of V
  • motor nucleus of V

Question 22

Question
The afferents of cell bodies located in the trigeminal ganglion terminate at the...
Answer
  • mesencephalic nucleus of V
  • spinal nucleus of V
  • dorsal horn of spinal cord
  • motor nucleus of V

Question 23

Question
The motor nucleus of V contains cell bodies for afferents that...
Answer
  • innervate muscle of facial expression
  • innervate tongue muscles
  • innervate muscles of mastication
  • innervate muscles of deglutition

Question 24

Question
Just as in the spinal cerebral sensory pathways, there are three neurons for trigeminal cerebral pathways.
Answer
  • True
  • False

Question 25

Question
At the level of the closed medulla...
Answer
  • principal sensory nucleus of V has adjacent region called substantia gelatinosa
  • you will see the spinal nucleus of V along with spinal tract of V

Question 26

Question
Which of these structures is continuous with the dorsal horn?
Answer
  • spinal nucleus of V
  • mesencephalic nucleus of V
  • substantia gelatinosa
  • no structures are continuous with dorsal horn

Question 27

Question
Second order neurons of trigeminal pathway synapse at [blank_start]VPM thalamus[blank_end].
Answer
  • VPM thalamus

Question 28

Question
This pathways has its primary afferents in the trigeminal ganglion. It then sends an axon to synapse at principal sensory nucleus of V. Axon of second order neuron synapses directly at VPM thalmus. Which is this pathway?
Answer
  • spinothalamic pathway
  • rostral trigeminal pathway
  • caudal trigeminal pathway
  • visceral pathway

Question 29

Question
Where do first order neurons that transmit pain sensation via the caudal trigeminal-thalamic pathway synapse?
Answer
  • most rostral part of spinal nucleus of V
  • pars caudalis of spinal nucleus of V
  • primary sensory of V
  • mesencephalic of V

Question 30

Question
Neurons that communicate position sense of the jaw....
Answer
  • have their 1st order neurons in the trigeminal ganglion
  • have axons of their first order neurons pass through the trigeminal ganglion
  • have the axons of 1st order neurons synapse at rostral part of spinal nucleus of V
  • have 2nd order cell bodies located in the mesencephalic nucleus of V

Question 31

Question
How many neurons are in the spino-cerebellar pathways?
Answer
  • 1
  • 2
  • 3
  • 4

Question 32

Question
1st order neurons of the spinal cerebellar pathways synapse ipsilaterally.
Answer
  • True
  • False

Question 33

Question
Compared to the dorsal column medial lemniscus pathway the dorsal-cuneo spinocerebellar pathway...
Answer
  • is separated by lower and upper extremeties
  • carries information about pain and temperature
  • crosses the midline in the medulla
  • none of these are true.

Question 34

Question
The cuneo cerebellar pathways sends information levels ...... in the spinal cord, synapsing then traveling to the ..... cerebellum via the ......
Answer
  • above T3....ipsilateral....inferior cerebellar penduncle
  • above T3....ipsilateral....accessory cuneate nucleus
  • above T6....contralateral....inferior cerebellar peduncle
  • above T6....ipsilateral....accessory cuneate nucleus

Question 35

Question
Where do fibers from the cuneu-cerebellar pathway that enter at levels C6 synapse?
Answer
  • accessory cuneate nucleus
  • nucleus cuneatus
  • deep nuclei of cerebellum
  • column of clarke

Question 36

Question
Nucleus cuneatus is to accessory nucleus as nucleus gracilis is to....
Answer
  • spinal nucleus of V
  • column of clarke
  • substantian nigra

Question 37

Question
The first order neuron for the information that goes from the lower limbs to the cerebellum is located...
Answer
  • in the accessory cuneate nucleus
  • column of clark
  • nucleus gracilis
  • medial part of dorsal column medial lemniscus

Question 38

Question
Visceral information from cranial nerves VII, IX and X synapse at the
Answer
  • nucleus ambigiuus
  • nucleus solitarus
  • nucleus gracilis
  • central gray

Question 39

Question
The axons from the nucleus solitarus projects to....
Answer
  • VPM
  • hypothalamus
  • amygdala
  • all of these

Question 40

Question
The process of stereognosis is mediated between what two regions of the cerebral cortex?
Answer
  • posterior parietal and postcentral gyrus
  • postcentral gyrus and precentral gyrus
  • SII and postcentral gyrus
  • anterior parietal and precentral gyrus

Question 41

Question
Descending projections from primary sensory cortex to brainstem and spinal cord aid in the process of...
Answer
  • stereognosis
  • selective attention
  • sensory association
  • orientation and direction of stimuli
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