CBNS 121 Exam with complete solutions latest version.pdf, Exams of
Neuroscience
stages in targeting - ANSWER-defasciculation (axons gathering together)
-branching
-topographic mapping (creates boarder)
-connect to targets
innervation caused by balance of attracting / repulsive cues - ANSWERshifting
the concentration of attraction and repulsion cues can enhance the desired
state of innervation
sympathetic innervation of neutrophins - ANSWERNT3 can cause cell
innervation, without NT3 theres no innervation of sympathetic cells
neurotrophins - ANSWERpromotes cell growth and survival
semaphorins - ANSWERsuch as sema3A is a repulsion cue that keeps targets
out of the target region (found in the ventral cord)
, sema3A knockout in the SP - ANSWERallows sensory neurons to enter the
dorsal cord
target selection is achieved by what factors - ANSWER-attractive (NT3) and
repulsive (sema3Z) cues
-branching and defasciculation
topographic mapping - ANSWERordered representation of the world inside
the NS, it creates neuroanatomy
Frog experiment - ANSWERinverting the eye disrupted the visual mapping of
the world inside the frogs NS
purpose of complimentary gradients in topographic mapping - ANSWERthese
opposing gradients guide the axons and show them where to reside
chemo affinity and repulsion - ANSWERwithin the A-P axis these cues are
what the axons recognize inside the gradients mentioned earlier
(flipping the frogs eye, flipped these gradients and therefore flipped his visual
representation)
in A-P topographic mapping - ANSWERits created by contact mediated
repulsion, ephrin molecules stops neurons from passing their target location
via ephrin A
ephrins in A-P mapping - ANSWERhigher concentrations increase the
POSTERIOR region of the superior colliculus, without ephrins axons would go
past their target region
Neuroscience
stages in targeting - ANSWER-defasciculation (axons gathering together)
-branching
-topographic mapping (creates boarder)
-connect to targets
innervation caused by balance of attracting / repulsive cues - ANSWERshifting
the concentration of attraction and repulsion cues can enhance the desired
state of innervation
sympathetic innervation of neutrophins - ANSWERNT3 can cause cell
innervation, without NT3 theres no innervation of sympathetic cells
neurotrophins - ANSWERpromotes cell growth and survival
semaphorins - ANSWERsuch as sema3A is a repulsion cue that keeps targets
out of the target region (found in the ventral cord)
, sema3A knockout in the SP - ANSWERallows sensory neurons to enter the
dorsal cord
target selection is achieved by what factors - ANSWER-attractive (NT3) and
repulsive (sema3Z) cues
-branching and defasciculation
topographic mapping - ANSWERordered representation of the world inside
the NS, it creates neuroanatomy
Frog experiment - ANSWERinverting the eye disrupted the visual mapping of
the world inside the frogs NS
purpose of complimentary gradients in topographic mapping - ANSWERthese
opposing gradients guide the axons and show them where to reside
chemo affinity and repulsion - ANSWERwithin the A-P axis these cues are
what the axons recognize inside the gradients mentioned earlier
(flipping the frogs eye, flipped these gradients and therefore flipped his visual
representation)
in A-P topographic mapping - ANSWERits created by contact mediated
repulsion, ephrin molecules stops neurons from passing their target location
via ephrin A
ephrins in A-P mapping - ANSWERhigher concentrations increase the
POSTERIOR region of the superior colliculus, without ephrins axons would go
past their target region
