exam 3 review questions Flashcards
which are the only cells in the eye capable of firing AP?
ganglion cells
the eye is designed to best detect?
differences in light intensity
if you injected radioactive amino acids into the cell body of a neuron in layer 5 of the RIGHT LGN, you would expect to find the label in which layer of the striate cortex? (anterograde transport)
layer IVc- beta of right hemisphere
you are recording from a cell in the cortex that responds to color differences. what kind of cell could it be?
a blob cell
on a moonless night, one can see a dim star best with?
peripheral retina
layers 1 and 2 of your right LGN are destroyed. you would have problems seeing?
fast-moving stimuli in left visual field
when light strikes a photopigment
a second messenger system is activated that decreases levels of cGMP
T or F: cutting the right optic tract would cause loss of vision only in left eye
false - would lose left visual hemifield
which of the following is FALSE peripheral retina has... - more cones than rods - more receptor cells per ganglion cell - poor detailed vision - two of the above
more cones than rods
T or F: damage to left optic nerve would result in blindness in right visual hemifield
false - total blindness in left eye
properties of retinotopy include all of the following except..
point of light activates one ganglion cells
most nociceptors are
polymodal
which of the following would increase pain…
- inject naloxone
- stimulate raphe nuclei
- opiates
inject naloxone
the cause of phantom limb is thought to involve
a rewiring of neuronal circuitry in primary somatosensory cortex
T or F: temperature info follows the same pathway as touch
FALSE
the pathway followed by information is…
spinothalamic tract to VP nucleus of thalamus to S1
T or F: sensory information is modified in the brain stem and thalamus
true
which of the following about the primary somatosensory cortex is FALSE?
- responsive to visual info
- electrical stimulation causes sensation
- lesions impair somatic sensation
- also called 3b
responsive to visual info also
if the sarcoplasmic reticulum (SR) couldn’t remove Ca2+ from the muscle cytoplasm …
you would have a prolonged muscle contraction
without inhibitory interneurons you…
would have NO reciprocal inhibition
which of the following is FALSE about white muscle fibers?
fatigue slowly
T or F: LMN are distributed according to skeletal muscle density
true
which of the following is FALSE:
- motor units vary in size
- small motor neurons are recruited first
- gamma motor neurons innervate extrafusal fibers
- small neurons are more easily excited
gamma motor neurons innervate extrafusal fibers
what is the function of the reverse myotatic reflex?
keeps proper tension and prevents muscle overload
T or F: the lateral pathways involved in voluntary control of distal musculature and are under direct cortical control
true
the effect of corticospinal tract lesion is?
deficit in a fractioned movement of arms and hands & paralysis on contralateral side
which of the following is FALSE about movement coding in M1?
motor map cannot be changed
what is the primary role of the cerebellum?
control sequence and timing of muscle action
why is M1 thought to be the primary motor cortex?
ALL OF THE ABOVE
- heavily connected to SMA
- lowest threshold elicitation of movement by electrical stimulation
- strong connections to motor neurons
which of the following is mismatched?
- strategy: association areas of neocortex, basal ganglia
- execution: brain stem, spinal cord
- tactics: motor cortex, cerebellum
- ventromedial pathways: under cortical control
ventromedial pathways
