Competency Quiz II Flashcards
Patient presents with loss of pain and temp on L and loss of proprioception, joint position, and vibration on R. (both below C4 dermatome). Based on these findings, you can conclude that patient has a lesion of ________.
spinal chord
Patient has a loss of vibration and proprioception but preservation of pain and temp throughout all limbs and trunk. Based on pattern of loss, what might the etiology be?
demyelinating disease
*trunk involvement rules out peripheral–> central pattern etiologies
What level of nervous system does the spinothalamic tract decussate?
spinal chord
Where are cell bodies of 2nd order neurons in dorsal column system located?
nuclei cuneatus and gracilis
What feature of otoliths make them particularly sensitive to head position relative to gravity?
Calcium carbonate crystals
Describe the push-pull arrangement of semicircular canals:
In any moment plane, stereo cilia in canal move toward kinociulum (excited) and in paired canal on opposite side they move away from kinocilum (inhibited)
What best described VOR?
eye mvmnt is generated equal and opposite to head mvmnt for gaze stabilization
All semicircular canals open at both ends to the _____.
utricle.
Patient has difficulty swallowing (dysphagia) after cortical stroke because:
cortical control of CN nuclei is impaired
The visual system used for MOTOR planning is the _____.
dorsal stream
What percent of lateral cortico-spinal tract crosses and at what level?
90% at caudal medulla
Why does trunk and girdle motor control recover sooner and to greater extent after typical middle cerebral artery cortical stroke than the hand/foot?
the lateral cortical spinal tract innervates the hand/foot - stroke means there is no lateral cortical innervation to the hand/foot
