GRAY'S ANATOMY FOR STUDENTS
5TH EDITION
• AUTHOR(S)RICHARD L. DRAKE
TEST BANK
1
Reference
Ch. 1 — The Body — What is anatomy?
Stem
A 58-year-old patient arrives with an acute loss of coordinated
movement in the right arm. A clinician describes the deficit as a
failure of integrated structure–function relationships. Which
interpretation best reflects an anatomy-based explanation that
links structure to the observed functional impairment?
Options
A. A lesion of the precentral gyrus that disrupts upper motor
neuron output to the right arm.
B. A lesion of the contralateral brachial plexus trunks causing
motor and sensory loss in the right arm.
C. A lesion of the left corticospinal tract at the internal capsule
,producing contralateral distal weakness.
D. An injury to the right cerebellar hemisphere causing
ipsilateral incoordination of the right arm.
Correct answer
C
Correct Answer Rationale (3–4 sentences)
Gray’s emphasizes anatomical localization: a lesion of the left
corticospinal tract at the internal capsule produces contralateral
(right-sided) weakness due to compact somatotopic
organization of descending fibers. This matches the clinical
presentation of right arm motor deficit and links structure
(internal capsule) to functional outcome (contralateral distal
weakness). It is the best fit because the internal capsule lesion
disrupts corticospinal output before decussation in the
brainstem.
Incorrect Answer Rationales (1–3 sentences each)
A. A lesion of the precentral gyrus could cause contralateral
motor loss, but specifying “right arm” without hemisphere side
makes this less precise than the internal capsule localization.
B. A brachial plexus lesion would produce ipsilateral limb
deficits, not contralateral, and is peripheral rather than central.
D. Right cerebellar hemisphere lesions cause ipsilateral
incoordination but are primarily coordination (ataxia), not
isolated motor weakness.
,Teaching Point (≤20 words)
Lesions above the decussation produce contralateral deficits;
internal capsule lesions cause dense contralateral weakness.
Citation (Simplified APA)
Drake, R. L. (2024). Gray’s Anatomy for Students (5th Ed.). Ch. 1.
2
Reference
Ch. 1 — The Body — What is anatomy?
Stem
During a bedside exam, a student misidentifies anatomical
planes and cuts the specimen in a transverse plane labeled as
“coronal.” Which consequence most directly shows failure to
apply correct anatomical terminology to clinical reasoning?
Options
A. Erroneous interpretation of left-right relationships on cross-
sectional imaging.
B. Inability to identify superficial versus deep fascia on gross
dissection.
C. Mistaking anterior for posterior compartments during
surgery.
D. Confusing proximal and distal relationships in limb trauma.
Correct answer
A
, Correct Answer Rationale (3–4 sentences)
Correct plane identification underpins cross-sectional imaging
interpretation. Confusing transverse with coronal will invert
expected left–right and anterior–posterior relationships on
CT/MRI slices, leading to mislocalization of lesions. Gray’s
stresses consistent terminology to preserve anatomical
orientation across imaging and dissection, making option A the
most direct consequence.
Incorrect Answer Rationales (1–3 sentences each)
B. Superficial vs deep fascia relates to tissue layers, not plane
terminology.
C. Mistaking anterior/posterior compartments could follow
plane confusion but is a secondary surgical error; plane
mislabeling most directly impacts imaging orientation.
D. Proximal/distal confusion pertains to limb terms, not plane
misidentification on cross-section.
Teaching Point (≤20 words)
Consistent plane terminology is essential for accurate imaging
orientation and lesion localization.
Citation (Simplified APA)
Drake, R. L. (2024). Gray’s Anatomy for Students (5th Ed.). Ch. 1.
3
Reference
Ch. 1 — The Body — Imaging
5TH EDITION
• AUTHOR(S)RICHARD L. DRAKE
TEST BANK
1
Reference
Ch. 1 — The Body — What is anatomy?
Stem
A 58-year-old patient arrives with an acute loss of coordinated
movement in the right arm. A clinician describes the deficit as a
failure of integrated structure–function relationships. Which
interpretation best reflects an anatomy-based explanation that
links structure to the observed functional impairment?
Options
A. A lesion of the precentral gyrus that disrupts upper motor
neuron output to the right arm.
B. A lesion of the contralateral brachial plexus trunks causing
motor and sensory loss in the right arm.
C. A lesion of the left corticospinal tract at the internal capsule
,producing contralateral distal weakness.
D. An injury to the right cerebellar hemisphere causing
ipsilateral incoordination of the right arm.
Correct answer
C
Correct Answer Rationale (3–4 sentences)
Gray’s emphasizes anatomical localization: a lesion of the left
corticospinal tract at the internal capsule produces contralateral
(right-sided) weakness due to compact somatotopic
organization of descending fibers. This matches the clinical
presentation of right arm motor deficit and links structure
(internal capsule) to functional outcome (contralateral distal
weakness). It is the best fit because the internal capsule lesion
disrupts corticospinal output before decussation in the
brainstem.
Incorrect Answer Rationales (1–3 sentences each)
A. A lesion of the precentral gyrus could cause contralateral
motor loss, but specifying “right arm” without hemisphere side
makes this less precise than the internal capsule localization.
B. A brachial plexus lesion would produce ipsilateral limb
deficits, not contralateral, and is peripheral rather than central.
D. Right cerebellar hemisphere lesions cause ipsilateral
incoordination but are primarily coordination (ataxia), not
isolated motor weakness.
,Teaching Point (≤20 words)
Lesions above the decussation produce contralateral deficits;
internal capsule lesions cause dense contralateral weakness.
Citation (Simplified APA)
Drake, R. L. (2024). Gray’s Anatomy for Students (5th Ed.). Ch. 1.
2
Reference
Ch. 1 — The Body — What is anatomy?
Stem
During a bedside exam, a student misidentifies anatomical
planes and cuts the specimen in a transverse plane labeled as
“coronal.” Which consequence most directly shows failure to
apply correct anatomical terminology to clinical reasoning?
Options
A. Erroneous interpretation of left-right relationships on cross-
sectional imaging.
B. Inability to identify superficial versus deep fascia on gross
dissection.
C. Mistaking anterior for posterior compartments during
surgery.
D. Confusing proximal and distal relationships in limb trauma.
Correct answer
A
, Correct Answer Rationale (3–4 sentences)
Correct plane identification underpins cross-sectional imaging
interpretation. Confusing transverse with coronal will invert
expected left–right and anterior–posterior relationships on
CT/MRI slices, leading to mislocalization of lesions. Gray’s
stresses consistent terminology to preserve anatomical
orientation across imaging and dissection, making option A the
most direct consequence.
Incorrect Answer Rationales (1–3 sentences each)
B. Superficial vs deep fascia relates to tissue layers, not plane
terminology.
C. Mistaking anterior/posterior compartments could follow
plane confusion but is a secondary surgical error; plane
mislabeling most directly impacts imaging orientation.
D. Proximal/distal confusion pertains to limb terms, not plane
misidentification on cross-section.
Teaching Point (≤20 words)
Consistent plane terminology is essential for accurate imaging
orientation and lesion localization.
Citation (Simplified APA)
Drake, R. L. (2024). Gray’s Anatomy for Students (5th Ed.). Ch. 1.
3
Reference
Ch. 1 — The Body — Imaging
