Chapter 9 Quiz 2

A  is rare in healthy humans until after puberty

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

C  is a stage of normal early neural development

D  is always followed by regeneration.

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

A  only with their correct targets.

B  only with neurons of the same type.

C  with almost any neuron.

D  only with the correct glial cells.

E  only with glial cells

A  inertia.

B  promiscuity.

C  faithfulness

D  specificity

E  monogamy

A  neurons

B  guidance molecules

C  growth cones

D  pioneer cones

E  astrocytes

A  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.

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

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

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

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  half of the optic tectum degenerates

D  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.

A  fasciculation

B  blueprints

C  stopping and asking for directions

D  chemoaffinity

E  topographic gradients

A  early

B  quick

C  fast

D  pioneer

E  premier

A  detect the presence of dim lights

B  strike accurately at fly-like stimuli

C  perform a visual discrimination task

D  solve maze problems

E    

F  identify colors.

A  tectum.

B  cerebellum.

C  visual cortex.

D  tegmentum.

E  thalamus.

A  aggregation.

B  degeneration.

C  color vision.

D  proliferation.

E  regeneration.

A  cell-adhesion hypothesis

B  chemoaffinity hypothesis

C  growth cone hypothesis

D  radial glial hypothesis.

E  CAM hypothesis

A  growth cone adhesion digits.

B  siphons.

C  filopodia

D  pseudopodia.

E  adhesion digits.

A  radial glial cells

B  ependymal cells

C    

D  neural cell-adhesion molecules

E  retinal ganglion cells

F  growth cones

A  sprouting.

B  differentiation.

C  proliferation.

D  aggregation.

E  cell death.

A  cortex.

B  peripheral nervous system.

C  neural tube.

D  circulatory system of the brain.

E  ventricular system.

A  canal.

B  crest.

C  groove

D  zone.

E  layer.

A  inside out

B  subventricular.

C  insidious.

D  accelerated.

E  ependymal.

A  age

B  timing

C  ease

D  experience

E  genetics