CLINICAL NEUROANATOMY
MADE RIDICULOUSLY SIMPLE
6TH EDITION
• AUTHOR(S)STEPHEN
GOLDBERG, M.D.
TEST BANK
1) Sensory root localization
Reference: Ch. 1 — General Organization — Sensory vs Motor
Roots
Stem:
A patient develops numbness over a band of skin on the trunk
after a spinal injury, but muscle strength and reflexes remain
intact. The deficit follows a single segmental pattern rather than
a diffuse distribution. Which structure is most likely damaged?
,Options:
A. Dorsal root
B. Ventral root
C. Anterior horn cell
D. Corticospinal tract
Correct Answer: A. Dorsal root
Rationale:
Correct: The dorsal root carries primary sensory afferent fibers
into the spinal cord, so an isolated sensory deficit without
weakness points to dorsal root injury. A segmental pattern
strongly supports a root-level lesion.
B: Ventral roots carry motor efferents, so damage there would
cause weakness rather than isolated numbness.
C: Anterior horn cell disease produces lower motor neuron
weakness, atrophy, and fasciculations, not isolated sensory loss.
D: Corticospinal tract injury causes upper motor neuron
weakness and spasticity, not a pure sensory deficit.
Teaching Point:
Sensory loss alone suggests a dorsal root problem.
Citation: Goldberg, S. (n.d.). Clinical Neuroanatomy Made
Ridiculously Simple (6th ed.). Ch. 1.
2) Motor root localization
Reference: Ch. 1 — General Organization — Ventral Root
Function
,Stem:
After compression at the spinal canal, a patient develops
weakness in one limb but no loss of pain, temperature, or
vibration. Reflexes in the affected myotomes are reduced.
Which structure is most likely compressed?
Options:
A. Dorsal root
B. Ventral root
C. Posterior column
D. Spinothalamic tract
Correct Answer: B. Ventral root
Rationale:
Correct: The ventral root contains motor efferent fibers, so
compression produces weakness and reduced reflexes without
primary sensory loss.
A: Dorsal root lesions cause sensory loss, often with radicular
pain.
C: Posterior column damage impairs vibration and
proprioception, not isolated motor function.
D: Spinothalamic tract damage causes pain and temperature
loss, not isolated weakness.
Teaching Point:
Ventral root = motor output.
Citation: Goldberg, S. (n.d.). Clinical Neuroanatomy Made
Ridiculously Simple (6th ed.). Ch. 1.
, 3) Lower motor neuron lesion pattern
Reference: Ch. 1 — General Organization — Gray Matter Motor
Neurons
Stem:
A child develops flaccid weakness, muscle atrophy, and
fasciculations in the hands after a viral illness. Sensation is
preserved. Which structure is most likely affected?
Options:
A. Anterior horn cell
B. Posterior horn cell
C. Dorsal root ganglion
D. Cerebral cortex
Correct Answer: A. Anterior horn cell
Rationale:
Correct: Anterior horn cells are lower motor neurons; damage
causes flaccid weakness, atrophy, and fasciculations with
preserved sensation.
B: Posterior horn cells process sensory input, so they do not
produce a pure motor syndrome.
C: Dorsal root ganglion lesions primarily affect sensation.
D: Cerebral cortex lesions usually produce upper motor neuron
findings, not fasciculations and marked atrophy.
Teaching Point:
Flaccid weakness + atrophy = lower motor neuron.
MADE RIDICULOUSLY SIMPLE
6TH EDITION
• AUTHOR(S)STEPHEN
GOLDBERG, M.D.
TEST BANK
1) Sensory root localization
Reference: Ch. 1 — General Organization — Sensory vs Motor
Roots
Stem:
A patient develops numbness over a band of skin on the trunk
after a spinal injury, but muscle strength and reflexes remain
intact. The deficit follows a single segmental pattern rather than
a diffuse distribution. Which structure is most likely damaged?
,Options:
A. Dorsal root
B. Ventral root
C. Anterior horn cell
D. Corticospinal tract
Correct Answer: A. Dorsal root
Rationale:
Correct: The dorsal root carries primary sensory afferent fibers
into the spinal cord, so an isolated sensory deficit without
weakness points to dorsal root injury. A segmental pattern
strongly supports a root-level lesion.
B: Ventral roots carry motor efferents, so damage there would
cause weakness rather than isolated numbness.
C: Anterior horn cell disease produces lower motor neuron
weakness, atrophy, and fasciculations, not isolated sensory loss.
D: Corticospinal tract injury causes upper motor neuron
weakness and spasticity, not a pure sensory deficit.
Teaching Point:
Sensory loss alone suggests a dorsal root problem.
Citation: Goldberg, S. (n.d.). Clinical Neuroanatomy Made
Ridiculously Simple (6th ed.). Ch. 1.
2) Motor root localization
Reference: Ch. 1 — General Organization — Ventral Root
Function
,Stem:
After compression at the spinal canal, a patient develops
weakness in one limb but no loss of pain, temperature, or
vibration. Reflexes in the affected myotomes are reduced.
Which structure is most likely compressed?
Options:
A. Dorsal root
B. Ventral root
C. Posterior column
D. Spinothalamic tract
Correct Answer: B. Ventral root
Rationale:
Correct: The ventral root contains motor efferent fibers, so
compression produces weakness and reduced reflexes without
primary sensory loss.
A: Dorsal root lesions cause sensory loss, often with radicular
pain.
C: Posterior column damage impairs vibration and
proprioception, not isolated motor function.
D: Spinothalamic tract damage causes pain and temperature
loss, not isolated weakness.
Teaching Point:
Ventral root = motor output.
Citation: Goldberg, S. (n.d.). Clinical Neuroanatomy Made
Ridiculously Simple (6th ed.). Ch. 1.
, 3) Lower motor neuron lesion pattern
Reference: Ch. 1 — General Organization — Gray Matter Motor
Neurons
Stem:
A child develops flaccid weakness, muscle atrophy, and
fasciculations in the hands after a viral illness. Sensation is
preserved. Which structure is most likely affected?
Options:
A. Anterior horn cell
B. Posterior horn cell
C. Dorsal root ganglion
D. Cerebral cortex
Correct Answer: A. Anterior horn cell
Rationale:
Correct: Anterior horn cells are lower motor neurons; damage
causes flaccid weakness, atrophy, and fasciculations with
preserved sensation.
B: Posterior horn cells process sensory input, so they do not
produce a pure motor syndrome.
C: Dorsal root ganglion lesions primarily affect sensation.
D: Cerebral cortex lesions usually produce upper motor neuron
findings, not fasciculations and marked atrophy.
Teaching Point:
Flaccid weakness + atrophy = lower motor neuron.
