Podcast
Questions and Answers
A patient presents with anosmia following a traumatic brain injury. Which cranial nerve is MOST likely affected?
A patient presents with anosmia following a traumatic brain injury. Which cranial nerve is MOST likely affected?
- Facial (CN VII)
- Trigeminal (CN V)
- Optic (CN II)
- Olfactory (CN I) (correct)
Following a stroke, a patient exhibits difficulty in moving their eyes and presents with diplopia. Which cranial nerve is MOST likely affected?
Following a stroke, a patient exhibits difficulty in moving their eyes and presents with diplopia. Which cranial nerve is MOST likely affected?
- Oculomotor (CN III) (correct)
- Trigeminal (CN V)
- Facial (CN VII)
- Vagus (CN X)
A doctor is evaluating a patient who cannot distinguish between sharp and dull touch on their cheek. Which of the following cranial nerves should the doctor assess FIRST?
A doctor is evaluating a patient who cannot distinguish between sharp and dull touch on their cheek. Which of the following cranial nerves should the doctor assess FIRST?
- Vagus (CN X)
- Facial (CN VII)
- Optic (CN II)
- Trigeminal (CN V) (correct)
A patient is experiencing a sudden drop in blood pressure and a slowed heart rate. Which division of the autonomic nervous system is MOST likely predominating?
A patient is experiencing a sudden drop in blood pressure and a slowed heart rate. Which division of the autonomic nervous system is MOST likely predominating?
During an intense workout, which physiological response is LEAST likely to be directly mediated by the sympathetic nervous system?
During an intense workout, which physiological response is LEAST likely to be directly mediated by the sympathetic nervous system?
Flashcards
Olfactory Nerve (CN I)
Olfactory Nerve (CN I)
The cranial nerve responsible for the sense of smell.
Optic Nerve (CN II)
Optic Nerve (CN II)
The cranial nerve that transmits visual information from the eye to the brain.
Oculomotor Nerve (CN III)
Oculomotor Nerve (CN III)
The cranial nerve that controls eye movement, pupil constriction, and eyelid elevation.
Sympathetic Division
Sympathetic Division
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Parasympathetic Division
Parasympathetic Division
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Study Notes
- Six important cranial nerves exist
Cranial Nerves
- Olfactory nerve (CN I) relates to smell
- Optic nerve (CN II) relates to vision
- Oculomotor nerve (CN III) relates to eye movement
- Trigeminal nerve (CN V) relates to facial sensation
- Facial nerve (CN VII) relates to facial muscles
- Vagus nerve (CN X) relates to internal organs
Autonomic Nervous System
- Contains the sympathetic and parasympathetic divisions
Sympathetic Division
- Activated during stress ("fight or flight")
- Increases heart rate and blood pressure
- Dilates pupils and bronchial tubes
- Triggers sweating
- Uses epinephrine as neurotransmitter
Parasympathetic Division
- Active during normal conditions ("rest and digest")
- Decreases heart rate and blood pressure
- Promotes digestion
- Uses acetylcholine as neurotransmitter
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