Biol 373 Unit 2: CNS Development || with Error-free Answers.
CNS development - cnidaria correct answers Show radial symmetry, no identifiable control
center
CNS development - flatworms correct answers Rudimentary brain in head, bilateral symmetry,
senses cluster around the "food end", distinction b/w CNS + PNS is not yet clear.
CNS development - earthworms correct answers Show signs of spinal reflexes, more advanced
nervous system
Most dramatic change seen in vertebrate brain evolution correct answers Change in forebrain
region (cerebrum), also cerebellum of the hindbrain
Neurulation def'n correct answers The process whereby the neural plate forms into a neural
tube...marks beginning of CNS formation
Neurulation process correct answers At 3 weeks, the neural plate begins to form into a neural
fold and when convergence occurs, it becomes the neural tube. Neural crest cells migrate off of
the tube to become the PNS. The neural tube is the precursor of the CNS.
Development of CNS at 4 weeks correct answers Anterior end of the neural tube is specialized
into 3 regions at this week period - forebrain, midbrain, hindbrain (the posterior part is the spinal
cord).
Development of CNS at 6 weeks correct answers The neural tube has differentiated into the
major brain regions present at birth at this week period.
Forebrain - diencephalon, cerebrum.
Hindbrain - medulla, cerebellum, pons.
Midbrain - not much.
, Development of CNS at 11 weeks correct answers At this week period, the growth of the
cerebrum has much outpaced that of other regions. Diencephalon is hidden under the cerebrum.
Reason why the brain has convulsions correct answers Caused by the rapid growth of the brain in
a confined space (skull).
By week 6, the CNS has formed the 7 major divisions that are present at birth: correct answers
Cerebrum (forebrain)
Diencephalon (forebrain)
Midbrain
Cerebellum (hindbrain)
Pons (hindbrain)
Medulla oblongata (hindbrain)
Spinal cord
Name the 3 meninges of the CNS correct answers Dura mater
Arachnoid membrane
Pia mater
Dura mater correct answers Outermost meninge of CNS
Durable + thick
Associated w/ veins that drain blood from the brain
Arachnoid membrane correct answers Middle meninge of CNS
Lots of blood vessels here
Branchy material in between, cobweb-like
CNS development - cnidaria correct answers Show radial symmetry, no identifiable control
center
CNS development - flatworms correct answers Rudimentary brain in head, bilateral symmetry,
senses cluster around the "food end", distinction b/w CNS + PNS is not yet clear.
CNS development - earthworms correct answers Show signs of spinal reflexes, more advanced
nervous system
Most dramatic change seen in vertebrate brain evolution correct answers Change in forebrain
region (cerebrum), also cerebellum of the hindbrain
Neurulation def'n correct answers The process whereby the neural plate forms into a neural
tube...marks beginning of CNS formation
Neurulation process correct answers At 3 weeks, the neural plate begins to form into a neural
fold and when convergence occurs, it becomes the neural tube. Neural crest cells migrate off of
the tube to become the PNS. The neural tube is the precursor of the CNS.
Development of CNS at 4 weeks correct answers Anterior end of the neural tube is specialized
into 3 regions at this week period - forebrain, midbrain, hindbrain (the posterior part is the spinal
cord).
Development of CNS at 6 weeks correct answers The neural tube has differentiated into the
major brain regions present at birth at this week period.
Forebrain - diencephalon, cerebrum.
Hindbrain - medulla, cerebellum, pons.
Midbrain - not much.
, Development of CNS at 11 weeks correct answers At this week period, the growth of the
cerebrum has much outpaced that of other regions. Diencephalon is hidden under the cerebrum.
Reason why the brain has convulsions correct answers Caused by the rapid growth of the brain in
a confined space (skull).
By week 6, the CNS has formed the 7 major divisions that are present at birth: correct answers
Cerebrum (forebrain)
Diencephalon (forebrain)
Midbrain
Cerebellum (hindbrain)
Pons (hindbrain)
Medulla oblongata (hindbrain)
Spinal cord
Name the 3 meninges of the CNS correct answers Dura mater
Arachnoid membrane
Pia mater
Dura mater correct answers Outermost meninge of CNS
Durable + thick
Associated w/ veins that drain blood from the brain
Arachnoid membrane correct answers Middle meninge of CNS
Lots of blood vessels here
Branchy material in between, cobweb-like
