PNB 2264 Exam 3 Practice Questions
and All Accurate Answers 2026
Updated.
Consider a sensory pathway transmitting information about a fine touch, vibration or
proprioceptive stimulus originating from your right index finger. The first order neuron transmits
information from a __A___ and its cell body is found in the ___B___. The first order neuron
synapses with the second order neuron in the ___C____. Cell bodies of third order neurons are
found in the ____D_____ and the third order neurons terminate in the ____E_____. - Answer
A: Mechanoreceptor
B: Dorsal root ganglion
C: Medulla
D: Thalamus
E: Postcentral gyrus
Consider a sensory pathway transmitting information about a temperature stimulus originating
from your right index finger. The first order neuron transmits information from the ___A___ its
cell body is found in the ___B____.The first order neuron synapses with the second order
neuron in the __C____. Cell bodies of third order neurons are found in the ___D___ and the
third order neurons terminate in the ___E____. - Answer A: Thermoreceptor
B: Dorsal root ganglion
C: Dorsal root
D: Thalamus
E: Postcentral gyrus
Consider again the sensory pathways transmitting information about fine, discriminatory touch
and pressure, vibration, and proprioception stimulus originating from your right finger. Axons of
the first order neurons are carried in the ___A___ and axons of second order neurons make up
the __B____. The pathway crosses to the left side in the __C___. Wiring for the process of
lateral inhibition is found in the ____D___ and serves this function: __E___. - Answer A:
Fasciculus cuneatus
B: Medial lemniscus
C: Medulla
D: Medulla
E: Localization
Pain afferents release _____A_______ as a transmitter. Descending analgesic (pain relief)
neurons that synapse with the ______B__________ of the pain afferent may interrupt the
transmission of pain information by affecting voltage gated channels. - Answer A: Substance
P
,B: Axon terminal
Match structure and function:
A: Hypothalamus
B: Medulla
C: Cerebellum
D: Precentral gyrus
E: Limbic System - Answer A: Temperature regulations
B: Respiratory control center
C: Coordination
D: Primary motor cortex
E: Emotion and memory
Match structure and description:
A: Fasciculus gracilis
B: Medial lemniscus
C: Nucleus gracilis
D: Thalamus - Answer A: Tract in spinal cord
B: Tract in brain
C: Gray matter in medulla
D: Gray matter in diencephalon
Match structure and function:
A: Basal Ganglia
B: Superior colliculus
C: Thalamus
D: Spinothalamic tract
E: Reticulospinal tract - Answer A: Subcortical nuclei important in movement
B: Midbrain structure involved in head/eye movement
C: Sensory relay nuclei in diencephalon
D: Sensory transmission in spinal cord
E: Motor transmission in spinal cord
, Put the following structures in the sequence that correctly describes the path light follows
starting with entering the eye and ending with absorption by pigment epithelium or
photopigment. - Answer Cornea
Pupil
Lens
Retinal ganglion cell layer
Amacrine cell layer
Bipolar cell layer
Horizontal cell layer
Receptors (rods and cones)
Light is refracted by the ___A___. Contraction of the __B____ muscle causes the suspensory
ligament to become __C____ which allows the ____D___ to become more ___E___ for close
vision. The process just described allows light to be focused upon the ___F___, which has the
greatest density of cones - Answer A: Both
B: Ciliary
C: Looser
D: Lens
E: Rounded
F: Fovea
Put the following events in the correct sequence, beginning with the membrane potential of a
rod cell in the DARK. (Note: "Vm" is membrane potential.) - Answer Vm -40 mV
Causes glutamate release
Excitation of Off Bipolar cells
Light absorbed by rhodopsin
Cation channel closes
Vm -70 mV
Causes glutamate release to stop
Excitation of On Bipolar cells
Which of the following are true statements concerning on-center retinal ganglion cells and their
receptive field (RF) characteristics? (Note: "annular stimulation" refers to a donut-shaped circle
of light illuminating a surround but not the center of an RF.) 5 answers. - Answer 1. Retinal
ganglion cell axons make up the optic nerve (cranial nerve II)
2. A spot of light illuminating a small portion of the RF center produces an on response
3. Annular light stimulation illuminating the surround of the RF produces an off response
and All Accurate Answers 2026
Updated.
Consider a sensory pathway transmitting information about a fine touch, vibration or
proprioceptive stimulus originating from your right index finger. The first order neuron transmits
information from a __A___ and its cell body is found in the ___B___. The first order neuron
synapses with the second order neuron in the ___C____. Cell bodies of third order neurons are
found in the ____D_____ and the third order neurons terminate in the ____E_____. - Answer
A: Mechanoreceptor
B: Dorsal root ganglion
C: Medulla
D: Thalamus
E: Postcentral gyrus
Consider a sensory pathway transmitting information about a temperature stimulus originating
from your right index finger. The first order neuron transmits information from the ___A___ its
cell body is found in the ___B____.The first order neuron synapses with the second order
neuron in the __C____. Cell bodies of third order neurons are found in the ___D___ and the
third order neurons terminate in the ___E____. - Answer A: Thermoreceptor
B: Dorsal root ganglion
C: Dorsal root
D: Thalamus
E: Postcentral gyrus
Consider again the sensory pathways transmitting information about fine, discriminatory touch
and pressure, vibration, and proprioception stimulus originating from your right finger. Axons of
the first order neurons are carried in the ___A___ and axons of second order neurons make up
the __B____. The pathway crosses to the left side in the __C___. Wiring for the process of
lateral inhibition is found in the ____D___ and serves this function: __E___. - Answer A:
Fasciculus cuneatus
B: Medial lemniscus
C: Medulla
D: Medulla
E: Localization
Pain afferents release _____A_______ as a transmitter. Descending analgesic (pain relief)
neurons that synapse with the ______B__________ of the pain afferent may interrupt the
transmission of pain information by affecting voltage gated channels. - Answer A: Substance
P
,B: Axon terminal
Match structure and function:
A: Hypothalamus
B: Medulla
C: Cerebellum
D: Precentral gyrus
E: Limbic System - Answer A: Temperature regulations
B: Respiratory control center
C: Coordination
D: Primary motor cortex
E: Emotion and memory
Match structure and description:
A: Fasciculus gracilis
B: Medial lemniscus
C: Nucleus gracilis
D: Thalamus - Answer A: Tract in spinal cord
B: Tract in brain
C: Gray matter in medulla
D: Gray matter in diencephalon
Match structure and function:
A: Basal Ganglia
B: Superior colliculus
C: Thalamus
D: Spinothalamic tract
E: Reticulospinal tract - Answer A: Subcortical nuclei important in movement
B: Midbrain structure involved in head/eye movement
C: Sensory relay nuclei in diencephalon
D: Sensory transmission in spinal cord
E: Motor transmission in spinal cord
, Put the following structures in the sequence that correctly describes the path light follows
starting with entering the eye and ending with absorption by pigment epithelium or
photopigment. - Answer Cornea
Pupil
Lens
Retinal ganglion cell layer
Amacrine cell layer
Bipolar cell layer
Horizontal cell layer
Receptors (rods and cones)
Light is refracted by the ___A___. Contraction of the __B____ muscle causes the suspensory
ligament to become __C____ which allows the ____D___ to become more ___E___ for close
vision. The process just described allows light to be focused upon the ___F___, which has the
greatest density of cones - Answer A: Both
B: Ciliary
C: Looser
D: Lens
E: Rounded
F: Fovea
Put the following events in the correct sequence, beginning with the membrane potential of a
rod cell in the DARK. (Note: "Vm" is membrane potential.) - Answer Vm -40 mV
Causes glutamate release
Excitation of Off Bipolar cells
Light absorbed by rhodopsin
Cation channel closes
Vm -70 mV
Causes glutamate release to stop
Excitation of On Bipolar cells
Which of the following are true statements concerning on-center retinal ganglion cells and their
receptive field (RF) characteristics? (Note: "annular stimulation" refers to a donut-shaped circle
of light illuminating a surround but not the center of an RF.) 5 answers. - Answer 1. Retinal
ganglion cell axons make up the optic nerve (cranial nerve II)
2. A spot of light illuminating a small portion of the RF center produces an on response
3. Annular light stimulation illuminating the surround of the RF produces an off response
