Biol 373 Unit 2: CNS Development Test
Questions And Answers Latest!!!
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
Pia mater CORRECT ANSWERS Innermost meninge of CNS
Thin + adheres to surface of brain and spinal cord
Associated w/ arteries that supply blood to brain
Contains interstitial fluid
Purpose of meninges of CNS CORRECT ANSWERS These 3 layers help stabilize
neural tissue and protect it from bruising. They are b/w the bones (skull, vertebrae) and
tissues (brain, spinal cord) of the CNS. They are continuous b/w brain + spinal cord.
Purpose of ventricles of CNS CORRECT ANSWERS Four fluid-filled spaces in the brain
and hollow central canal in the spinal cord that are continuous w/ one another. The fluid
in these spaces flush the brain. All four of these spaces produce the fluid, called
cerebrospinal fluid (CSF).
Pathway of cerebrospinal fluid (CSF) CORRECT ANSWERS 1. Lateral ventricles from
choroid plexus in middle of brain
2. 3rd ventricle
3. Down to 4th ventricle, some down spinal cord
4. Sub-arachnoid space around the brain (flows b/w meninges)
5. Up to the arachnoid villi on top of the brain and out to the blood stream
Function of the choroid plexus CORRECT ANSWERS This structure is located in the
walls of the 4 ventricles of the CNS and secretes a salty solution called CSF. It's a
dense bed of blood vessels + capillaries that have walls of tightly-joined ependymal
cells (part of the blood-brain barrier).
Questions And Answers Latest!!!
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
Pia mater CORRECT ANSWERS Innermost meninge of CNS
Thin + adheres to surface of brain and spinal cord
Associated w/ arteries that supply blood to brain
Contains interstitial fluid
Purpose of meninges of CNS CORRECT ANSWERS These 3 layers help stabilize
neural tissue and protect it from bruising. They are b/w the bones (skull, vertebrae) and
tissues (brain, spinal cord) of the CNS. They are continuous b/w brain + spinal cord.
Purpose of ventricles of CNS CORRECT ANSWERS Four fluid-filled spaces in the brain
and hollow central canal in the spinal cord that are continuous w/ one another. The fluid
in these spaces flush the brain. All four of these spaces produce the fluid, called
cerebrospinal fluid (CSF).
Pathway of cerebrospinal fluid (CSF) CORRECT ANSWERS 1. Lateral ventricles from
choroid plexus in middle of brain
2. 3rd ventricle
3. Down to 4th ventricle, some down spinal cord
4. Sub-arachnoid space around the brain (flows b/w meninges)
5. Up to the arachnoid villi on top of the brain and out to the blood stream
Function of the choroid plexus CORRECT ANSWERS This structure is located in the
walls of the 4 ventricles of the CNS and secretes a salty solution called CSF. It's a
dense bed of blood vessels + capillaries that have walls of tightly-joined ependymal
cells (part of the blood-brain barrier).
