Textbook Question
The connective tissue sheath that surrounds a fascicle of nerve fibers is the
a. Epineurium
b. Endoneurium
c. Perineurium
d. Epimysium
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13. The Peripheral Nervous System
Introduction to the Peripheral Nervous System
3:45 minutesProblem 9
Textbook Question
Cranial nerves that have some function in vision include the:
a. Trochlear
b. Trigeminal
c. Abducens
d. Facial.
Verified step by step guidance1
Step 1: Begin by recalling the primary functions of cranial nerves. Cranial nerves are numbered I through XII and have specific roles, such as sensory, motor, or mixed functions. Some cranial nerves are directly involved in vision or eye movement.
Step 2: Identify the cranial nerves listed in the options and their respective functions. For example:
- Trochlear (CN IV): Controls the superior oblique muscle, which helps in eye movement.
- Trigeminal (CN V): Primarily involved in facial sensation and mastication, not directly related to vision.
- Abducens (CN VI): Controls the lateral rectus muscle, which moves the eye laterally.
- Facial (CN VII): Primarily involved in facial expressions and taste, not directly related to vision.
Step 3: Focus on the cranial nerves that contribute to vision or eye movement. Vision-related functions include controlling eye muscles or transmitting visual information to the brain.
Step 4: Eliminate options that are not directly involved in vision. For example, the trigeminal nerve (CN V) and facial nerve (CN VII) do not have roles in vision or eye movement.
Step 5: Conclude that the trochlear nerve (CN IV) and abducens nerve (CN VI) are the correct answers because they are involved in controlling eye movement, which is essential for vision.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cranial Nerves
Cranial nerves are a set of twelve paired nerves that emerge directly from the brain, primarily responsible for motor and sensory functions of the head and neck. Each cranial nerve has specific roles, and understanding their functions is crucial for identifying which ones are involved in vision.
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Vision-related Cranial Nerves
Several cranial nerves are directly involved in vision, including the optic nerve (II), which transmits visual information from the retina to the brain, and the oculomotor (III), trochlear (IV), and abducens (VI) nerves, which control eye movements. Recognizing these nerves is essential for answering questions about visual function.
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Function of Specific Cranial Nerves
Each cranial nerve has distinct functions; for example, the trochlear nerve controls the superior oblique muscle, aiding in downward and lateral eye movement, while the abducens nerve controls lateral eye movement. Understanding these specific functions helps in determining which cranial nerves contribute to vision.
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