Chapter 9 Quiz 2

A  is a common, but unfortunate, consequence of accidental exposure to neural gradients.

B  is rare in healthy humans until after puberty

C  is always followed by regeneration.

D  is a stage of normal early neural development

E  starts to occur in humans around the age of 50.

A  only with the correct glial cells.

B  with almost any neuron.

C  only with glial cells

D  only with neurons of the same type.

E  only with their correct targets.

A  promiscuity.

B  faithfulness

C  inertia.

D  monogamy

E  specificity

A  growth cones

B  astrocytes

C  guidance molecules

D  neurons

E  pioneer cones

A  retinas and optic tectums always grow in precise proportion to one another.

B  axons do not grow out from the retinas until their target structures (e.g., optic tectums) are fully grown.

C  axons do not grow out from the retinas until the retinas are fully grown, which is why babies have disproportionately large eyes.

D  the synaptic connections originally formed by retinal ganglion cells on the optic tectums gradually shift as both the eyes and optic tectums grow at different rates during development.

A  the destroyed retina regenerates and then axons grow out from the complete retina and innervate the optic tectum in the species-typical fashion.

B  the axons grow out from the retinal ganglion cells in the remaining half of the retina to their original targets on the optic tectum.

C  the axons grow out from the retinal ganglion cells in the remaining half of the retina to targets systematically distributed over the entire optic tectum.

D  half of the optic tectum degenerates

A  stopping and asking for directions

B  chemoaffinity

C  blueprints

D  topographic gradients

E  fasciculation

A  fast

B  pioneer

C  early

D  premier

E  quick

A  detect the presence of dim lights

B  perform a visual discrimination task

C    

D  identify colors.

E  strike accurately at fly-like stimuli

F  solve maze problems

A  tegmentum.

B  tectum.

C  cerebellum.

D  visual cortex.

E  thalamus.

A  color vision.

B  aggregation.

C  regeneration.

D  proliferation.

E  degeneration.

A  cell-adhesion hypothesis

B  radial glial hypothesis.

C  growth cone hypothesis

D  chemoaffinity hypothesis

E  CAM hypothesis

A  adhesion digits.

B  siphons.

C  pseudopodia.

D  growth cone adhesion digits.

E  filopodia

A  neural cell-adhesion molecules

B  retinal ganglion cells

C  radial glial cells

D  growth cones

E  ependymal cells

F    

A  aggregation.

B  cell death.

C  differentiation.

D  sprouting.

E  proliferation.

A  neural tube.

B  cortex.

C  peripheral nervous system.

D  circulatory system of the brain.

E  ventricular system.

A  canal.

B  groove

C  crest.

D  layer.

E  zone.

A  ependymal.

B  subventricular.

C  accelerated.

D  insidious.

E  inside out

A  age

B  timing

C  genetics

D  ease

E  experience