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BIOL251 Human Anatomy & Physiology I with Lab
Module 7 Exam Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified – Pass Guaranteed – A+ Graded
Cranial Nerves (Names, Numbers, Functions)
Q1: Which of the following cranial nerves is the only one that exits the skull through the
cribriform plate?
A. Optic nerve (II)
B. Olfactory nerve (I)
C. Oculomotor nerve (III)
D. Trochlear nerve (IV)
Correct Answer: B
Rationale: The olfactory nerve (I) is responsible for the sense of smell and passes through the
tiny holes of the cribriform plate of the ethmoid bone to reach the nasal mucosa.
Q2: During a neurological exam, a physician shines a light into a patient's eye, and the pupil
constricts. Which cranial nerve carries the motor information to the constrictor muscles of the
iris?
A. Optic nerve (II)
B. Oculomotor nerve (III)
C. Trochlear nerve (IV)
D. Abducens nerve (VI)
Correct Answer: B
Rationale: While the optic nerve senses the light, the oculomotor nerve (III) provides the
parasympathetic motor output that causes the pupillary constrictor muscles to contract.
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Q3: A patient presents with difficulty looking down and inward. The doctor suspects a lesion in
which cranial nerve, known for its unique path exiting from the posterior aspect of the
brainstem?
A. Oculomotor (III)
B. Trochlear (IV)
C. Trigeminal (V)
D. Abducens (VI)
Correct Answer: B
Rationale: The trochlear nerve (IV) innervates the superior oblique muscle, which depresses and
intorts the eye, and it is unique for emerging dorsally from the midbrain.
Q4: Which cranial nerve is responsible for transmitting sensory information from the cornea (the
blink reflex) and is a major component of the sensation from the face?
A. Facial nerve (VII)
B. Trigeminal nerve (V)
C. Vagus nerve (X)
D. Glossopharyngeal nerve (IX)
Correct Answer: B
Rationale: The ophthalmic branch (V1) of the trigeminal nerve provides sensory innervation to
the cornea, triggering the afferent limb of the corneal blink reflex.
Q5: A musician complains of loss of taste on the anterior two-thirds of their tongue and some
dryness in the mouth. Which cranial nerve is most likely involved?
A. Vagus nerve (X)
B. Hypoglossal nerve (XII)
C. Glossopharyngeal nerve (IX)
D. Facial nerve (VII)
Correct Answer: D
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Rationale: The facial nerve (VII) carries taste sensations from the anterior two-thirds of the
tongue via the chorda tympani and also controls parasympathetic secretions for the
submandibular and sublingual glands.
Q6: Clinical Scenario: A patient arrives at the ER unable to close their left eye or smile on the
left side of their face; the corner of the mouth droops. The physician diagnoses Bell's palsy.
Which cranial nerve is affected?
A. Trigeminal nerve (V)
B. Facial nerve (VII)
C. Vagus nerve (X)
D. Accessory nerve (XI)
Correct Answer: B
Rationale: Bell's palsy involves a lower motor neuron lesion of the facial nerve (VII), which
controls the muscles of facial expression, including the orbicularis oculi (eye closing) and
buccinator/orbicularis oris (smiling).
Q7: Which cranial nerve is purely sensory and is responsible for hearing and equilibrium?
A. Facial nerve (VII)
B. Vestibulocochlear nerve (VIII)
C. Glossopharyngeal nerve (IX)
D. Vagus nerve (X)
Correct Answer: B
Rationale: The vestibulocochlear nerve (VIII) has two divisions: the vestibular branch for
equilibrium/balance and the cochlear branch for hearing, and it carries no motor fibers.
Q8: A patient has a difficult time swallowing (dysphagia) and lacks a gag reflex. Damage to
which cranial nerves would most likely cause this deficit?
A. Vagus (X) and Glossopharyngeal (IX)
B. Hypoglossal (XII) and Vagus (X)
C. Accessory (XI) and Hypoglossal (XII)
BIOL251 Human Anatomy & Physiology I with Lab
Module 7 Exam Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified – Pass Guaranteed – A+ Graded
Cranial Nerves (Names, Numbers, Functions)
Q1: Which of the following cranial nerves is the only one that exits the skull through the
cribriform plate?
A. Optic nerve (II)
B. Olfactory nerve (I)
C. Oculomotor nerve (III)
D. Trochlear nerve (IV)
Correct Answer: B
Rationale: The olfactory nerve (I) is responsible for the sense of smell and passes through the
tiny holes of the cribriform plate of the ethmoid bone to reach the nasal mucosa.
Q2: During a neurological exam, a physician shines a light into a patient's eye, and the pupil
constricts. Which cranial nerve carries the motor information to the constrictor muscles of the
iris?
A. Optic nerve (II)
B. Oculomotor nerve (III)
C. Trochlear nerve (IV)
D. Abducens nerve (VI)
Correct Answer: B
Rationale: While the optic nerve senses the light, the oculomotor nerve (III) provides the
parasympathetic motor output that causes the pupillary constrictor muscles to contract.
,2
Q3: A patient presents with difficulty looking down and inward. The doctor suspects a lesion in
which cranial nerve, known for its unique path exiting from the posterior aspect of the
brainstem?
A. Oculomotor (III)
B. Trochlear (IV)
C. Trigeminal (V)
D. Abducens (VI)
Correct Answer: B
Rationale: The trochlear nerve (IV) innervates the superior oblique muscle, which depresses and
intorts the eye, and it is unique for emerging dorsally from the midbrain.
Q4: Which cranial nerve is responsible for transmitting sensory information from the cornea (the
blink reflex) and is a major component of the sensation from the face?
A. Facial nerve (VII)
B. Trigeminal nerve (V)
C. Vagus nerve (X)
D. Glossopharyngeal nerve (IX)
Correct Answer: B
Rationale: The ophthalmic branch (V1) of the trigeminal nerve provides sensory innervation to
the cornea, triggering the afferent limb of the corneal blink reflex.
Q5: A musician complains of loss of taste on the anterior two-thirds of their tongue and some
dryness in the mouth. Which cranial nerve is most likely involved?
A. Vagus nerve (X)
B. Hypoglossal nerve (XII)
C. Glossopharyngeal nerve (IX)
D. Facial nerve (VII)
Correct Answer: D
, 3
Rationale: The facial nerve (VII) carries taste sensations from the anterior two-thirds of the
tongue via the chorda tympani and also controls parasympathetic secretions for the
submandibular and sublingual glands.
Q6: Clinical Scenario: A patient arrives at the ER unable to close their left eye or smile on the
left side of their face; the corner of the mouth droops. The physician diagnoses Bell's palsy.
Which cranial nerve is affected?
A. Trigeminal nerve (V)
B. Facial nerve (VII)
C. Vagus nerve (X)
D. Accessory nerve (XI)
Correct Answer: B
Rationale: Bell's palsy involves a lower motor neuron lesion of the facial nerve (VII), which
controls the muscles of facial expression, including the orbicularis oculi (eye closing) and
buccinator/orbicularis oris (smiling).
Q7: Which cranial nerve is purely sensory and is responsible for hearing and equilibrium?
A. Facial nerve (VII)
B. Vestibulocochlear nerve (VIII)
C. Glossopharyngeal nerve (IX)
D. Vagus nerve (X)
Correct Answer: B
Rationale: The vestibulocochlear nerve (VIII) has two divisions: the vestibular branch for
equilibrium/balance and the cochlear branch for hearing, and it carries no motor fibers.
Q8: A patient has a difficult time swallowing (dysphagia) and lacks a gag reflex. Damage to
which cranial nerves would most likely cause this deficit?
A. Vagus (X) and Glossopharyngeal (IX)
B. Hypoglossal (XII) and Vagus (X)
C. Accessory (XI) and Hypoglossal (XII)
