BIO 334 EXAM 1 QUESTIONS AND ANSWERS
100% CORRECT
Mammalian cerebral cortex (Select the CORRECT statement)
a) Similar to primates, the postcentral gyrus of the rodent cerebral cortex receives
sensory information from the body.
b) In the right primary motor cortex (M1), pyramidal neurons known as Betz cells carry
motor commands that control movement on the left side of the body.
c) Stellate cells are located in layer I of the cerebral cortex and they have relatively
short axons that communicate locally.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER b) In the right primary motor
cortex (M1), pyramidal neurons known as Betz cells carry motor commands that control
movement on the left side of the body.
Cerebrospinal fluid (CSF) (Select the CORRECT statement)
a) The blood-CSF barrier is formed by tight junctions between endothelial cells that form
the capillaries of the choroid plexus.
b) CSF is absorbed by arachnoid villi and moved into the two lateral ventricles before
combining with venous blood in the superior sagittal sinus.
c) CSF moves by bulk flow from its site of production (choroid plexus) to the superior
sagittal sinus.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER c) CSF moves by bulk flow from
its site of production (choroid plexus) to the superior sagittal sinus.
Decussation and stroke Select the CORRECT statement
a) An ischemic stroke in the left middle cerebral artery could lead to skeletal muscle
paralysis on the right side of the body.
b) The phenomenon known as decussation is unique among primates and evolved as an
adaptation to a brachiating mode of locomotion (swinging from branch to branch
, through the forest canopy).
c) In most people, an ischemic stroke in the right middle cerebral artery would lead to a
loss of the ability to comprehend language.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER a) An ischemic stroke in the left
middle cerebral artery could lead to skeletal muscle paralysis on the right side of the
body.
Evolution of nervous systems (Select the CORRECT statement)
a) Paramecium is an example of a single-celled animal that can generate action
potentials by controlling the flux of calcium ions across its cell membrane.
b) The emergence of bilateral symmetry is associated with the evolution of neurons with
specialized functions, including sensory neurons, motor neurons, and interneurons that
are interposed between sensory and motor neurons.
c) Cnidaria such as Hydra are invertebrates with a ventral nerve cord that coordinates
movement along the animal's anterior-posterior axis.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER d) Statements (A) and (B) are
correct and (C) is incorrect.
Mammalian brain organization (Select the CORRECT statement)
a) The corpus collosum forms an axonal bridge that links neurons located in the two
cerebral hemispheres.
b) The lateral sulcus separates the occipital lobe from the temporal lobe.
c) In a 'split brain' patient (i.e. a patient in which the corpus collosum has been severed),
visual stimuli are not relayed from the retina to the visual cortex.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER a) The corpus collosum forms
an axonal bridge that links neurons located in the two cerebral hemispheres.
Embryonic development of prosencephalon (Select the CORRECT statement)
100% CORRECT
Mammalian cerebral cortex (Select the CORRECT statement)
a) Similar to primates, the postcentral gyrus of the rodent cerebral cortex receives
sensory information from the body.
b) In the right primary motor cortex (M1), pyramidal neurons known as Betz cells carry
motor commands that control movement on the left side of the body.
c) Stellate cells are located in layer I of the cerebral cortex and they have relatively
short axons that communicate locally.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER b) In the right primary motor
cortex (M1), pyramidal neurons known as Betz cells carry motor commands that control
movement on the left side of the body.
Cerebrospinal fluid (CSF) (Select the CORRECT statement)
a) The blood-CSF barrier is formed by tight junctions between endothelial cells that form
the capillaries of the choroid plexus.
b) CSF is absorbed by arachnoid villi and moved into the two lateral ventricles before
combining with venous blood in the superior sagittal sinus.
c) CSF moves by bulk flow from its site of production (choroid plexus) to the superior
sagittal sinus.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER c) CSF moves by bulk flow from
its site of production (choroid plexus) to the superior sagittal sinus.
Decussation and stroke Select the CORRECT statement
a) An ischemic stroke in the left middle cerebral artery could lead to skeletal muscle
paralysis on the right side of the body.
b) The phenomenon known as decussation is unique among primates and evolved as an
adaptation to a brachiating mode of locomotion (swinging from branch to branch
, through the forest canopy).
c) In most people, an ischemic stroke in the right middle cerebral artery would lead to a
loss of the ability to comprehend language.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER a) An ischemic stroke in the left
middle cerebral artery could lead to skeletal muscle paralysis on the right side of the
body.
Evolution of nervous systems (Select the CORRECT statement)
a) Paramecium is an example of a single-celled animal that can generate action
potentials by controlling the flux of calcium ions across its cell membrane.
b) The emergence of bilateral symmetry is associated with the evolution of neurons with
specialized functions, including sensory neurons, motor neurons, and interneurons that
are interposed between sensory and motor neurons.
c) Cnidaria such as Hydra are invertebrates with a ventral nerve cord that coordinates
movement along the animal's anterior-posterior axis.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER d) Statements (A) and (B) are
correct and (C) is incorrect.
Mammalian brain organization (Select the CORRECT statement)
a) The corpus collosum forms an axonal bridge that links neurons located in the two
cerebral hemispheres.
b) The lateral sulcus separates the occipital lobe from the temporal lobe.
c) In a 'split brain' patient (i.e. a patient in which the corpus collosum has been severed),
visual stimuli are not relayed from the retina to the visual cortex.
d) Statements (A) and (B) are correct and (C) is incorrect.
e) Statements (A), (B) and (C) are all correct. - ANSWER a) The corpus collosum forms
an axonal bridge that links neurons located in the two cerebral hemispheres.
Embryonic development of prosencephalon (Select the CORRECT statement)
