Chapter 9 Quiz 2

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

B  is always followed by regeneration.

C  is a stage of normal early neural development

D  is rare in healthy humans until after puberty

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

A  only with neurons of the same type.

B  with almost any neuron.

C  only with the correct glial cells.

D  only with glial cells

E  only with their correct targets.

A  inertia.

B  specificity

C  monogamy

D  promiscuity.

E  faithfulness

A  pioneer cones

B  neurons

C  astrocytes

D  guidance molecules

E  growth cones

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

B  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.

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

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

A  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.

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

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 their original targets on the optic tectum.

A  chemoaffinity

B  fasciculation

C  stopping and asking for directions

D  blueprints

E  topographic gradients

A  early

B  quick

C  premier

D  pioneer

E  fast

A  strike accurately at fly-like stimuli

B  detect the presence of dim lights

C  perform a visual discrimination task

D    

E  identify colors.

F  solve maze problems

A  tegmentum.

B  cerebellum.

C  tectum.

D  thalamus.

E  visual cortex.

A  color vision.

B  degeneration.

C  aggregation.

D  regeneration.

E  proliferation.

A  growth cone hypothesis

B  radial glial hypothesis.

C  chemoaffinity hypothesis

D  cell-adhesion hypothesis

E  CAM hypothesis

A  siphons.

B  adhesion digits.

C  pseudopodia.

D  filopodia

E  growth cone adhesion digits.

A  retinal ganglion cells

B    

C  growth cones

D  radial glial cells

E  ependymal cells

F  neural cell-adhesion molecules

A  sprouting.

B  proliferation.

C  differentiation.

D  cell death.

E  aggregation.

A  peripheral nervous system.

B  neural tube.

C  ventricular system.

D  circulatory system of the brain.

E  cortex.

A  layer.

B  crest.

C  groove

D  canal.

E  zone.

A  accelerated.

B  ependymal.

C  inside out

D  insidious.

E  subventricular.

A  experience

B  ease

C  genetics

D  age

E  timing