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Questions and Answers
What is the color of the cranial and spinal nerves in dissection?
What is the color of the cranial and spinal nerves in dissection?
- Grayish white (correct)
- Pure white
- Dark brown
- Yellowish brown
What supports the nerve fibers (axons) in the cranial and spinal nerves?
What supports the nerve fibers (axons) in the cranial and spinal nerves?
- Epithelial tissue
- Muscular tissue
- Fibrous connective tissue
- Delicate areolar tissue (correct)
How many pairs of cranial nerves leave the brain?
How many pairs of cranial nerves leave the brain?
- 10 pairs
- 20 pairs
- 12 pairs (correct)
- 15 pairs
What is the pathway through which the cranial nerves pass in the skull?
What is the pathway through which the cranial nerves pass in the skull?
What are the nerve fibers (axons) in the cranial and spinal nerves also known as?
What are the nerve fibers (axons) in the cranial and spinal nerves also known as?
What is the main component of the peripheral nervous system?
What is the main component of the peripheral nervous system?
What is the name of the cranial nerve with the number CN I?
What is the name of the cranial nerve with the number CN I?
What is the function of the ganglia in the peripheral nervous system?
What is the function of the ganglia in the peripheral nervous system?
What is the primary role of the peripheral nervous system?
What is the primary role of the peripheral nervous system?
What is unique about each cranial nerve?
What is unique about each cranial nerve?
What are the cranial nerves named according to?
What are the cranial nerves named according to?
What is the main region where the cranial nerves are found?
What is the main region where the cranial nerves are found?
What is the origin of the cranial nerves?
What is the origin of the cranial nerves?
What is the pathway of the cranial nerves?
What is the pathway of the cranial nerves?
What is the distribution of cranial nerves in the body?
What is the distribution of cranial nerves in the body?
Which nerve provides motor fibers to the neck and upper back?
Which nerve provides motor fibers to the neck and upper back?
Which nerve is responsible for sensory information related to taste?
Which nerve is responsible for sensory information related to taste?
Which nerve provides motor fibers to the eye muscles?
Which nerve provides motor fibers to the eye muscles?
Which nerve is responsible for sensory information related to balance and hearing?
Which nerve is responsible for sensory information related to balance and hearing?
Which nerve provides motor fibers to the pharynx?
Which nerve provides motor fibers to the pharynx?
Which nerve is responsible for sensory information related to vision?
Which nerve is responsible for sensory information related to vision?
Which nerve provides motor fibers to the face?
Which nerve provides motor fibers to the face?
Which nerve is responsible for motor fibers to the tongue?
Which nerve is responsible for motor fibers to the tongue?
What is the primary function of the Trigeminal nerve?
What is the primary function of the Trigeminal nerve?
Which of the following nerves are entirely motor?
Which of the following nerves are entirely motor?
What is the primary function of the Abducent nerve?
What is the primary function of the Abducent nerve?
Which of the following nerves are mixed, meaning they have both sensory and motor functions?
Which of the following nerves are mixed, meaning they have both sensory and motor functions?
What is the primary function of the Olfactory nerve?
What is the primary function of the Olfactory nerve?
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Study Notes
Peripheral Nervous System
- Consists of cranial and spinal nerves and their associated ganglia.
- Cranial and spinal nerves are seen as grayish white cords on dissection.
- Made up of bundles of nerve fibers (axons) supported by delicate areolar tissue.
Cranial Nerves
- 12 pairs of cranial nerves that leave the brain and pass through foramina in the skull.
- Named as follows:
- I: Olfactory nerve
- II: Optic nerve
- III: Oculomotor nerve
- IV: Trochlear nerve
- V: Trigeminal nerve
- VI: Abducent nerve
- VII: Facial nerve
- VIII: Vestibulocochlear nerve
- IX: Glossopharyngeal nerve
- X: Vagus nerve
- XI: Accessory nerve
- XII: Hypoglossal nerve
Functions of Cranial Nerves
- Olfactory nerve: sensory for smell
- Optic nerve: sensory for vision
- Oculomotor nerve: motor fibers to eye muscles
- Trochlear nerve: motor fibers to eye muscles
- Trigeminal nerve: sensory for the face; motor fibers to chewing muscles
- Abducent nerve: motor fibers to eye muscles
- Facial nerve: sensory for taste; motor fibers to the face
- Vestibulocochlear nerve: sensory for balance and hearing
- Glossopharyngeal nerve: sensory for taste; motor fibers to the pharynx
- Vagus nerve: motor fibers to neck and upper back
- Accessory nerve: motor fibers to neck and upper back
- Hypoglossal nerve: motor fibers to the tongue
Classification of Cranial Nerves
- Entirely sensory: olfactory, optic, and vestibulocochlear nerves
- Entirely motor: oculomotor, trochlear, abducent, accessory, and hypoglossal nerves
- Mixed: remaining nerves
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