BIO 201 EXAM 4 WITH CORRECT
ANSWERS 2025
Rostral correct answers >> toward the nose
Caudal correct answers >> toward the tail
Major portions of the brain correct answers >> Brain stem,
Cerebrum, cerebellum
Cerebrum is ___% of brain volume correct answers >> 83
Cerebellum contains ___% of the neurons correct answers >>
50
The brain weighs ___ pounds correct answers >> 3.5
Longitudinal Fissure correct answers >> separates 2 cerebral
hemispheres (left/right)
Central Sulcus correct answers >> Separates frontal &
parietal lobe
Gyri correct answers >> folds
,Sulci correct answers >> grooves
cortex correct answers >> surface layer of gray matter
nuclei correct answers >> deeper masses of gray matter
tracts correct answers >> bundles of axons
gray matter correct answers >> neuron cell bodies, dendrites
& synapses
-forms cortex over cerebrum & cerebellum
-forms nuclei deep with in brain
white matter correct answers >> bundles of axons
-forms tracts that connect parts of the brain
Meninges correct answers >> Dura Mater, arachnoid mater,
pia mater
Dura mater correct answers >> outermost, tough membrane
-outer periosteal layer against bone
-inner meningeal layer
-subdural space (below dura mater)
-where separated from inner meningeal layer forms dural venous
sinusesdraining blood from brain
,supportive structures formed by dura mater correct answers
>> falx cerebri, falx cerebelli & tentorium cerebelli
Arachnoid mater correct answers >> spider web filamentous
layer
Pia mater correct answers >> a thin vascular layer adherent
to contours of brain
Meningitis correct answers >> Inflammation of the meninges
-bacterial & virus invasion of the CNS by way of the nose & throat
-signs: high fever, stiff neck, drowsiness & intense headache
which could lead to coma
-diagnose by examining the CSF fluid for bacteria
Lumbar puncture correct answers >> (spinal tap) check
spinal fluid
-draws fluid from subarachnoid space between two lumbar
vertebrae
Lateral ventricles correct answers >> found inside the
cerebral hemispheres
Third ventricle correct answers >> single vertical space
under corpus callosum
, Cerebral aqueduct correct answers >> runs through the
midbrain (connects 3rd & 4th ventricle)
Central canal correct answers >> runs down through spinal
cord
Ventricles correct answers >> Internal chambers within the
CNS
-lined with ependymal cells & containing choroid plexus of
capillaries that produce CSF
Cerebrospinal fluid correct answers >> clear liquid that fills
ventricles & canals & bathes in its external surface (in
subarachnoid space)
The brain produces & absorbs ___ml/day of CSF correct
answers >> 500
Functions of CSF correct answers >> Buoyancy: floats brain
so its neutrally buoyant
Protection: cushions from hitting inside of skull
Chemical stability: rinses away wastes
CSF escapes from ___ to surround the brain & is absorbed by ___
into venous sinus correct answers >> 4th ventricle/
arachnoid villi
ANSWERS 2025
Rostral correct answers >> toward the nose
Caudal correct answers >> toward the tail
Major portions of the brain correct answers >> Brain stem,
Cerebrum, cerebellum
Cerebrum is ___% of brain volume correct answers >> 83
Cerebellum contains ___% of the neurons correct answers >>
50
The brain weighs ___ pounds correct answers >> 3.5
Longitudinal Fissure correct answers >> separates 2 cerebral
hemispheres (left/right)
Central Sulcus correct answers >> Separates frontal &
parietal lobe
Gyri correct answers >> folds
,Sulci correct answers >> grooves
cortex correct answers >> surface layer of gray matter
nuclei correct answers >> deeper masses of gray matter
tracts correct answers >> bundles of axons
gray matter correct answers >> neuron cell bodies, dendrites
& synapses
-forms cortex over cerebrum & cerebellum
-forms nuclei deep with in brain
white matter correct answers >> bundles of axons
-forms tracts that connect parts of the brain
Meninges correct answers >> Dura Mater, arachnoid mater,
pia mater
Dura mater correct answers >> outermost, tough membrane
-outer periosteal layer against bone
-inner meningeal layer
-subdural space (below dura mater)
-where separated from inner meningeal layer forms dural venous
sinusesdraining blood from brain
,supportive structures formed by dura mater correct answers
>> falx cerebri, falx cerebelli & tentorium cerebelli
Arachnoid mater correct answers >> spider web filamentous
layer
Pia mater correct answers >> a thin vascular layer adherent
to contours of brain
Meningitis correct answers >> Inflammation of the meninges
-bacterial & virus invasion of the CNS by way of the nose & throat
-signs: high fever, stiff neck, drowsiness & intense headache
which could lead to coma
-diagnose by examining the CSF fluid for bacteria
Lumbar puncture correct answers >> (spinal tap) check
spinal fluid
-draws fluid from subarachnoid space between two lumbar
vertebrae
Lateral ventricles correct answers >> found inside the
cerebral hemispheres
Third ventricle correct answers >> single vertical space
under corpus callosum
, Cerebral aqueduct correct answers >> runs through the
midbrain (connects 3rd & 4th ventricle)
Central canal correct answers >> runs down through spinal
cord
Ventricles correct answers >> Internal chambers within the
CNS
-lined with ependymal cells & containing choroid plexus of
capillaries that produce CSF
Cerebrospinal fluid correct answers >> clear liquid that fills
ventricles & canals & bathes in its external surface (in
subarachnoid space)
The brain produces & absorbs ___ml/day of CSF correct
answers >> 500
Functions of CSF correct answers >> Buoyancy: floats brain
so its neutrally buoyant
Protection: cushions from hitting inside of skull
Chemical stability: rinses away wastes
CSF escapes from ___ to surround the brain & is absorbed by ___
into venous sinus correct answers >> 4th ventricle/
arachnoid villi
