BYU CELL 220 EXAM 2 /BYU CELL 220 EXAM
2 PREP 2025/2026 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTION|ALREADY
GRADED A+|NEWEST|BRAND NEW VERSION
!!|GUARANTEED PASS
How many pairs of spinal nerves are there?
31
Where are sensory neurons bodies and axons found?
The somas of sensory neurons are found in the dorsal root ganglion and the axons travel up the
spinal cord
Where are motor neuron cell bodies and axons found?
The somas of motor neurons are found in the anterior horn of the spinal cord and the axons
travel down the anterior rootlets
What is a dermatome?
A specific segment of skin supplied by a single pair of spinal nerves
What is a nerve plexus?
A network of interweaving spinal nerves that split into multiple named nerves that Innervates
various structures
What are the four principle nerve plexuses?
Cervical, Brachial, Lumbar, and Sacral
What is the Cervical Plexus?
Spinal nerves C1-C4. Innervates the anterior neck, parts of the head, and parts of the shoulder.
The Phrenic nerve also Innervates the diaphragm.
1|Page
,What is the Brachial Plexus?
Spinal Nerves C5-T1. Innervates the pectoral girdle and upper limbs. Splits into the Axillary,
Ulnar, Radial, Median, and Musculocutaneous nerves.
What is the Lumbosacral Plexus?
The Lumbar and Sacral Plexuses together
What is the Lumbar Plexus?
Spinal Nerves L1-L4. Innervates the anterior and medial thigh. Separates into the Femoral
Nerve, Sciatic Nerve, Tibial Nerve, and Common Fibular Nerve.
What is the Sacral Plexus?
Spinal Nerves L4-S4. Innervates all of the lower limb except the anterior/medial thigh. Separates
into the Femoral Nerve, Sciatic Nerve, Tibial Nerve, and Common Fibular Nerve.
What are monosynaptic reflexes?
The simplest of all reflexes. Does not include interneurons or the brain. (Ex: knee-jerk reaction)
What are polysynaptic reflexes?
More complex neural pathways. Includes interneurons. Does not include the brain. (Ex:
Withdrawl reflex)
The Somatic System...
Innervates skeletal muscle, only has one motor neuron to the target.
The Autonomic Nervous System...
Innervates cardiac muscle, smooth muscle, and glands. Has a chain of two motor neurons to the
target (preganglionic {myelinated} and postganglionic {unmyelinated}).
What are the ascending tracts of the spinal cord?
Tracts of the posterior funiculus, spinocerebellar tracts, and spinothalamic tracts
What are the descending tracts of the spinal cord?
Lateral Corticospinal tract and anterior Corticospinal tracts
What are the functions of the ascending and descending pathways of the spinal cord?
Conducting sensory or motor information and connecting the CNS to Cranial and Spinal nerves
2|Page
, Where are the ascending and descending pathways of the spinal cord found?
The white matter of the CNS
Where do preganglionic axons synapse?
The Sympathetic and Parasympathetic Ganglia
What are the functions of the sympathetic division?
Fight or Flight response
The sympathetic division includes the...
Thoracic and Lumbar Spinal Cord
The Sympathetic Nervous System effects...
Glands, the eyes, heart, blood vessels, smooth muscle tissue, digestive organs, sweat glands,
adrenal glands, bladder, and genitals
Where are sympathetic ganglia found?
Near the CNS and Vertebral Column
Where are parasympathetic ganglia found?
Near or within the target organ
What are the functions of the parasympathetic division?
"Rest and Digest" and conservation/replenishment of energy stores
The Parasympathetic Division exits from...
The Brainstem and Sacral Spinal Cord
The Parasympathetic Division affects the...
Eyes, Glands, Heart, Bronchi, Digestive Tract, Lower Colon, Bladder, and Genitals
When Innervates by both the sympathetic and parasympathetic divisions, the actions of the two
divisions often...
Oppose one another
Opposite effects on an organ can also be achieved by...
Increasing or decreasing activity in one division
What is the enteric nervous system?
3|Page
2 PREP 2025/2026 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTION|ALREADY
GRADED A+|NEWEST|BRAND NEW VERSION
!!|GUARANTEED PASS
How many pairs of spinal nerves are there?
31
Where are sensory neurons bodies and axons found?
The somas of sensory neurons are found in the dorsal root ganglion and the axons travel up the
spinal cord
Where are motor neuron cell bodies and axons found?
The somas of motor neurons are found in the anterior horn of the spinal cord and the axons
travel down the anterior rootlets
What is a dermatome?
A specific segment of skin supplied by a single pair of spinal nerves
What is a nerve plexus?
A network of interweaving spinal nerves that split into multiple named nerves that Innervates
various structures
What are the four principle nerve plexuses?
Cervical, Brachial, Lumbar, and Sacral
What is the Cervical Plexus?
Spinal nerves C1-C4. Innervates the anterior neck, parts of the head, and parts of the shoulder.
The Phrenic nerve also Innervates the diaphragm.
1|Page
,What is the Brachial Plexus?
Spinal Nerves C5-T1. Innervates the pectoral girdle and upper limbs. Splits into the Axillary,
Ulnar, Radial, Median, and Musculocutaneous nerves.
What is the Lumbosacral Plexus?
The Lumbar and Sacral Plexuses together
What is the Lumbar Plexus?
Spinal Nerves L1-L4. Innervates the anterior and medial thigh. Separates into the Femoral
Nerve, Sciatic Nerve, Tibial Nerve, and Common Fibular Nerve.
What is the Sacral Plexus?
Spinal Nerves L4-S4. Innervates all of the lower limb except the anterior/medial thigh. Separates
into the Femoral Nerve, Sciatic Nerve, Tibial Nerve, and Common Fibular Nerve.
What are monosynaptic reflexes?
The simplest of all reflexes. Does not include interneurons or the brain. (Ex: knee-jerk reaction)
What are polysynaptic reflexes?
More complex neural pathways. Includes interneurons. Does not include the brain. (Ex:
Withdrawl reflex)
The Somatic System...
Innervates skeletal muscle, only has one motor neuron to the target.
The Autonomic Nervous System...
Innervates cardiac muscle, smooth muscle, and glands. Has a chain of two motor neurons to the
target (preganglionic {myelinated} and postganglionic {unmyelinated}).
What are the ascending tracts of the spinal cord?
Tracts of the posterior funiculus, spinocerebellar tracts, and spinothalamic tracts
What are the descending tracts of the spinal cord?
Lateral Corticospinal tract and anterior Corticospinal tracts
What are the functions of the ascending and descending pathways of the spinal cord?
Conducting sensory or motor information and connecting the CNS to Cranial and Spinal nerves
2|Page
, Where are the ascending and descending pathways of the spinal cord found?
The white matter of the CNS
Where do preganglionic axons synapse?
The Sympathetic and Parasympathetic Ganglia
What are the functions of the sympathetic division?
Fight or Flight response
The sympathetic division includes the...
Thoracic and Lumbar Spinal Cord
The Sympathetic Nervous System effects...
Glands, the eyes, heart, blood vessels, smooth muscle tissue, digestive organs, sweat glands,
adrenal glands, bladder, and genitals
Where are sympathetic ganglia found?
Near the CNS and Vertebral Column
Where are parasympathetic ganglia found?
Near or within the target organ
What are the functions of the parasympathetic division?
"Rest and Digest" and conservation/replenishment of energy stores
The Parasympathetic Division exits from...
The Brainstem and Sacral Spinal Cord
The Parasympathetic Division affects the...
Eyes, Glands, Heart, Bronchi, Digestive Tract, Lower Colon, Bladder, and Genitals
When Innervates by both the sympathetic and parasympathetic divisions, the actions of the two
divisions often...
Oppose one another
Opposite effects on an organ can also be achieved by...
Increasing or decreasing activity in one division
What is the enteric nervous system?
3|Page
