Which cranial nerve is responsible for eye movement and is often assessed in a neurological exam?
Oculomotor nerve (CN III)
Facial nerve (CN VII)
Optic nerve (CN II)
Trigeminal nerve (CNV)
The Correct Answer is A
A. Oculomotor nerve (CN III): The Oculomotor nerve controls the majority of the extraocular muscles (superior, inferior, and medial rectus, and inferior oblique). It is responsible for moving the eye upward, downward, and inward, as well as lifting the eyelid and constricting the pupil.
B. Facial nerve (CN VII): The Facial nerve primarily controls muscles of facial expression (smiling, closing eyes tightly) and taste sensations, not the movement of the eyeball itself.
C. Optic nerve (CN II): The Optic nerve is a sensory nerve responsible for vision (sight). It transmits visual information from the retina to the brain but has no motor function to move the eye.
D. Trigeminal nerve (CN V): The Trigeminal nerve is primarily responsible for facial sensation (touch, pain, temperature) and the motor muscles of mastication (chewing). It does not control eye movement.
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Related Questions
Correct Answer is D
Explanation
A. Peripheral nervous system:The Peripheral Nervous System (PNS) is a broad anatomical division that includes all nerves outside the brain and spinal cord. While it contains the nerves that control muscles, it also includes the Autonomic system (involuntary). Therefore, "Peripheral" is too broad and not specific to voluntary control.
B. Central nervous system:The Central Nervous System (CNS) consists of the brain and spinal cord. While it processes the decision to move, the actual transmission of signals to the skeletal muscles for execution is the function of the Somatic division of the PNS.
C. Autonomic nervous system:The Autonomic Nervous System (ANS) controls involuntarybody functions, such as heart rate, digestion, and respiratory rate. It regulates smooth muscle, cardiac muscle, and glands, not voluntary skeletal muscle.
D. Somatic nervous system:The Somatic Nervous System is the functional subdivision of the peripheral nervous system specifically responsible for carrying motor and sensory information both to and from the central nervous system. It connects to skeletal muscles, allowing for voluntary movement (like walking or waving).
Correct Answer is B
Explanation
A. Oculomotor nerve (CN III):This is a motornerve responsible for controlling most of the eye's movements (extraocular muscles) and pupil constriction, not the sensation of sight.
B. Optic nerve (CN II):The Optic nerve is a purely sensorynerve. It carries electrical impulses generated by light hitting the retina directly to the visual cortex in the brain for interpretation as images.
C. Trochlear nerve (CN IV):This is a motor nerve responsible for innervating the superior oblique muscle, which moves the eye downward and inward.
D. Trigeminal nerve (CN V):This is a mixed nerve primarily responsible for facial sensation (touch, pain) and the motor function of chewing (mastication).
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