Complicated interlacing of the ventral rami form networks called nerve plexus. The crisscrossing of the nerve fibers from the various spinal nerves is advantageous because ________.
A) injury to any single spinal nerve will be less damaging as there is less chance of total loss of innervation to any particular organ
B) having several nerve fibers unite enhances sensory function
C) viruses that infect us by moving through PNS nerves are prevented entry to the CNS
D) having several nerve fibers unite enhances motor function
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Question 2) Feeling a gentle caress on your arm would likely involve all of the following except ________.
A) Meissner's corpuscles
B) hair follicle receptors
C) Lamellar corpuscles
D) tactile discs
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Question 3) Drooping of the upper eyelid, and double vision are potential symptoms of damage to the oculomotor nerve.
Indicate whether the statement is true or false
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Question 4) Injury to cervical vertebra C3-C4 is particularly problematic because ________.
A) several ganglia are near this region that serve the heart
B) the greater auricular nerve that serve the parotid gland receive there fibers from here
C) the phrenic nerve that serves the diaphragm receives its fibers from here
D) part of the brain stem is located here
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Question 5) A patient has an injury of the spine and is now suffering from a loss of motor function in his right arm. However, he still has normal sensory function in the arm.
Based on this information it is likely that the patient has nervous tissue damage located at ________.
A) the dorsal root located at one or more of the cervical vertebra
B) the ventral root located at one or more of the cervical vertebra
C) the dorsal rootlets located at one of the thoracic vertebra
D) spinal nerves of the cervical vertebra
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Question 6) Reciprocal inhibition means that while one sensory nerve is stimulated, another sensory neuron for synergistic muscles in the same area is inhibited and cannot respond.
Indicate whether the statement is true or false
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Question 7) A fall or an improperly delivered gluteal injection could result in ________.
A) sciatica
B) neurofibromatosis
C) postpoliomyelitis muscular atrophy
D) phantom limb pain
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Question 8) Irritation of the phrenic nerve may cause diaphragm spasms called hiccups.
Indicate whether the statement is true or false
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Question 9) Dorsal and ventral rami are similar in that they both contain sensory and motor fibers.
Indicate whether the statement is true or false
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Question 10) Dermatome maps are useful to clinicians because ________.
A) they show the routes of motor nerves
B) they outline the location of the numerous nerve plexus
C) they can help pinpoint the location of spinal injury
D) they show doctors how to avoid striking spinal nerves during surgery
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