NEUROBIOLOGY EXAM 2 REVIEW
SET QUESTIONS & ANSWERS
In the sensory homonculus, why is the right hand so large relative to the left foot? -
Correct Answers -There is a decreased number of neurons in the right postcentral gyrus
that respond to left foot stimulation than neurons in the left postcentral gyrus that
respond to right hand stimulation.
Identify the correct order of steps in the anatomical circuit for mechanosensory
information
I - Medullary afferents cross the midline, ascend, and synapse on third-order neurons in
the contralateral thalamus.
II - First Order Neuron in DRG relays peripheral information into the spinal cord.
III - Afferents ascend and synapse on second order-neurons in the ipsilateral medulla.
IV - Thalamic afferents synapse on neurons in the primary sensory cortex. - Correct
Answers -II, III, I, IV
A patient has had an unfortunate car accident that resulted in spinal cord damage.
Below the level of the belly button, the patient has difficulty sensing light touch on the
right side and heat on the left side. Where is the most likely location of the spinal cord
injury? - Correct Answers -Hemi section of the right spinal cord at T10. Indicated by loss
of touch reception on the ipsilateral side of injury and loss of temperature/pain sensation
on the contralateral side.
What does it mean that V1 neurons have orientation selectivity? - Correct Answers -
They respond strongly to a particular orientation of a line, bar, or edge.
Which statement best reflects the qualities of the retinotopic maps in the LGN and
striate cortex? - Correct Answers -They have more neurons devoted to central vision
and fewer neurons devoted to peripheral vision.
Which of the following provides the best description of the region damaged in patient
HM? - Correct Answers -Bilateral medial temporal lobe
Sonic hedgehog (Shh) in the developing brain is derived from... - Correct Answers -The
notochord and floorplate
What is true about the neural crest? - Correct Answers -It generates the neurons of the
peripheral nervous system and the peripheral glia
SET QUESTIONS & ANSWERS
In the sensory homonculus, why is the right hand so large relative to the left foot? -
Correct Answers -There is a decreased number of neurons in the right postcentral gyrus
that respond to left foot stimulation than neurons in the left postcentral gyrus that
respond to right hand stimulation.
Identify the correct order of steps in the anatomical circuit for mechanosensory
information
I - Medullary afferents cross the midline, ascend, and synapse on third-order neurons in
the contralateral thalamus.
II - First Order Neuron in DRG relays peripheral information into the spinal cord.
III - Afferents ascend and synapse on second order-neurons in the ipsilateral medulla.
IV - Thalamic afferents synapse on neurons in the primary sensory cortex. - Correct
Answers -II, III, I, IV
A patient has had an unfortunate car accident that resulted in spinal cord damage.
Below the level of the belly button, the patient has difficulty sensing light touch on the
right side and heat on the left side. Where is the most likely location of the spinal cord
injury? - Correct Answers -Hemi section of the right spinal cord at T10. Indicated by loss
of touch reception on the ipsilateral side of injury and loss of temperature/pain sensation
on the contralateral side.
What does it mean that V1 neurons have orientation selectivity? - Correct Answers -
They respond strongly to a particular orientation of a line, bar, or edge.
Which statement best reflects the qualities of the retinotopic maps in the LGN and
striate cortex? - Correct Answers -They have more neurons devoted to central vision
and fewer neurons devoted to peripheral vision.
Which of the following provides the best description of the region damaged in patient
HM? - Correct Answers -Bilateral medial temporal lobe
Sonic hedgehog (Shh) in the developing brain is derived from... - Correct Answers -The
notochord and floorplate
What is true about the neural crest? - Correct Answers -It generates the neurons of the
peripheral nervous system and the peripheral glia
