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BRS Lower limb Questions with 100%
Correct Answers | for Specific Exam
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A 27-year-old patient exhibits a loss of
skin sensation and paralysis of muscles on
the plantar aspect of the medial side of the
foot. Which of the following nerves is most
likely damaged?
(A) Common peroneal
(B) Tibial
(C) Superfi cial peroneal
(D) Deep peroneal
(E) Sural
:
vPretest - Stuvia US
,2
Ans: The Answer is B. The common peroneal nerve divides
into the deep peroneal nerve, which
innervates the anterior muscles of the leg and supplies the
adjacent skin of the first and second toes, and the superfi
cial peroneal nerve, which innervates the lateral muscles
of the leg and supplies the skin on the side of the lower
leg and the dorsum of the ankle and foot. The sural nerve
supplies the lateral aspect of the foot and the little toe.
A patient with a deep knife wound in the
buttock walks with a waddling gait that is
characterized by the pelvis falling toward
one side at each step. Which of the following
nerves is damaged?
(A) Obturator nerve
(B) Nerve to obturator internus
(C) Superior gluteal nerve
(D) Inferior gluteal nerve
(E) Femoral nerve
:
vPretest - Stuvia US
,3
Ans: The Answer is C. The superior gluteal nerve
innervates the gluteus medius muscle. Paralysis of this
muscle causes gluteal gait, a waddling gait
characterized by a falling of the pelvis toward the
unaffected side at each step. The gluteus medius muscle
normally functions to stabilize the pelvis when the
opposite foot is off the ground. The inferior gluteal nerve
innervates the gluteus maximus, and the nerve to the
obturator internus supplies the obturator internus and
superior gemellus muscles. The obturator nerve innervates
the adductor muscles of the thigh, and the femoral nerve
supplies the flexors of the thigh.
A patient is unable to prevent anterior
displacement of the femur on the tibia when
the knee is fl exed. Which of the following
ligaments is most likely damaged?
(A) Anterior cruciate
(B) Fibular collateral
(C) Patellar
(D) Posterior cruciate
:
vPretest - Stuvia US
, 4
(E) Tibial collateral
Ans: The Answer is D. The posterior cruciate ligament is
important because it prevents forward
displacement of the femur on the tibia when the knee is fl
exed. The anterior cruciate liga-
ment prevents backward displacement of the femur on
the tibia.
A 41-year-old man was involved in a fi ght
and felt weakness in extending the knee
joint. On examination, he was diagnosed
with a lesion of the femoral nerve. Which of
the following symptoms would be a result of
this nerve damage?
(A) Paralysis of the psoas major muscle
(B) Loss of skin sensation on the lateral side
of the foot
(C) Loss of skin sensation over the greater
trochanter
:
vPretest - Stuvia US
BRS Lower limb Questions with 100%
Correct Answers | for Specific Exam
A 27-year-old patient exhibits a loss of
skin sensation and paralysis of muscles on
the plantar aspect of the medial side of the
foot. Which of the following nerves is most
likely damaged?
(A) Common peroneal
(B) Tibial
(C) Superfi cial peroneal
(D) Deep peroneal
(E) Sural
:
vPretest - Stuvia US
,2
Ans: The Answer is B. The common peroneal nerve divides
into the deep peroneal nerve, which
innervates the anterior muscles of the leg and supplies the
adjacent skin of the first and second toes, and the superfi
cial peroneal nerve, which innervates the lateral muscles
of the leg and supplies the skin on the side of the lower
leg and the dorsum of the ankle and foot. The sural nerve
supplies the lateral aspect of the foot and the little toe.
A patient with a deep knife wound in the
buttock walks with a waddling gait that is
characterized by the pelvis falling toward
one side at each step. Which of the following
nerves is damaged?
(A) Obturator nerve
(B) Nerve to obturator internus
(C) Superior gluteal nerve
(D) Inferior gluteal nerve
(E) Femoral nerve
:
vPretest - Stuvia US
,3
Ans: The Answer is C. The superior gluteal nerve
innervates the gluteus medius muscle. Paralysis of this
muscle causes gluteal gait, a waddling gait
characterized by a falling of the pelvis toward the
unaffected side at each step. The gluteus medius muscle
normally functions to stabilize the pelvis when the
opposite foot is off the ground. The inferior gluteal nerve
innervates the gluteus maximus, and the nerve to the
obturator internus supplies the obturator internus and
superior gemellus muscles. The obturator nerve innervates
the adductor muscles of the thigh, and the femoral nerve
supplies the flexors of the thigh.
A patient is unable to prevent anterior
displacement of the femur on the tibia when
the knee is fl exed. Which of the following
ligaments is most likely damaged?
(A) Anterior cruciate
(B) Fibular collateral
(C) Patellar
(D) Posterior cruciate
:
vPretest - Stuvia US
, 4
(E) Tibial collateral
Ans: The Answer is D. The posterior cruciate ligament is
important because it prevents forward
displacement of the femur on the tibia when the knee is fl
exed. The anterior cruciate liga-
ment prevents backward displacement of the femur on
the tibia.
A 41-year-old man was involved in a fi ght
and felt weakness in extending the knee
joint. On examination, he was diagnosed
with a lesion of the femoral nerve. Which of
the following symptoms would be a result of
this nerve damage?
(A) Paralysis of the psoas major muscle
(B) Loss of skin sensation on the lateral side
of the foot
(C) Loss of skin sensation over the greater
trochanter
:
vPretest - Stuvia US
