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1.
Define the following terms, used in the case and also in associated questions.
o
Paresthesia –
abnormal sensation (unpleasant prickly feeling known as
“pins and needles”) in the absence of stimuli. Also described as burning,
numbness, tingling.
o
skin vesicle -
a small fluid filled sac on the skin.
o
dorsal –
posterior – pertaining to the back
o
ventral –
anterior
pertaining to the front
o
dormant –
inactive/latent (a normal physical function that has slowed down
for a period of time).
 
2.
The list below classifies sensory receptors by the stimulus that activates them. Using
your textbook or another resource, name the receptor for each stimulus type.
o
activated by touch, pressure, vibration, and stretch –
Mechanoreceptors
o
activated by changes in temperature -
Thermoreceptors
o
activated by light or changes in light wavelengths -
Photoreceptor
o
activated by changes in chemical concentrations in a solution -
Chemoreceptors
o
activated by tissue injury or situations that may lead to tissue injury –
Nociceptor
 
3.
Based on what you know about their stimuli, which type of sensory receptor is
activated and causing Sarah’s symptoms of pain and paresthesia?
Nociceptor
 
4.
The virus infecting Sarah lies dormant in the dorsal root ganglion. Does the dorsal
root and its ganglion carry sensory input, motor output, or both?
The dorsal root
and its ganglion carry the cell bodies of sensory neurons (sensory input).
 
5.
Based on the pattern of skin vesicles and pain, which of Sarah’s peripheral nerves is
infected? To which peripheral nerve plexus does this nerve belong?
Posterior
femoral cutaneous nerve (small sciatic nerve). It arrives from the sacral
plexus.
 
6.
If Sarah had skin vesicles on the anterolateral region of her neck, which peripheral
nerve is infected by the virus? To which peripheral nerve plexus does this nerve


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belong?
Transverse cervical nerve (cutaneous branch). It belongs to cervical
plexus.
 
7.
If Sarah had a viral infection that affected neuron function in the ventral root of the
same spinal nerve, how would the signs and symptoms be different than those she
has now?
If the ventral root of the same spinal nerve is affected, this would
impact motor function as the ventral root contains nerve fibers going to the
muscles. Specifically, this will impact muscles innervated by S1 and S2
myotome which will include predominantly buttocks (gluteus muscles) and
hamstrings. Sarah will have overall muscle weakness and difficulty walking,
standing up from a sitting position, and climbing stairs.


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