Textbook Question
Which of the following is not part of the auditory pathway in the CNS?
a. Superior temporal lobe
b. Superior colliculus
c. Medial geniculate nucleus
d. Nuclei in the pons
e. Cochlear nuclei
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15. The Special Senses
Introduction to Special Senses
Problem L2.2
Textbook Question
In which direction would you be unable to move your right eye if your right abducens nerve were damaged?
Verified step by step guidance1
Understand the function of the abducens nerve (cranial nerve VI): It innervates the lateral rectus muscle of the eye, which is responsible for moving the eye laterally (away from the midline). Damage to this nerve impairs lateral movement of the affected eye.
Identify the specific movement controlled by the lateral rectus muscle: The lateral rectus muscle pulls the eye outward, enabling abduction (movement away from the nose). Without proper function of this muscle, the eye cannot move laterally.
Consider the consequences of abducens nerve damage: If the right abducens nerve is damaged, the right lateral rectus muscle will be paralyzed, preventing the right eye from moving outward (laterally).
Relate the impaired movement to the anatomical direction: The inability to move the right eye laterally means the eye will remain closer to the midline and may even drift medially due to unopposed action of the medial rectus muscle.
Summarize the directional limitation: Damage to the right abducens nerve results in the inability to move the right eye outward (laterally), which is essential for proper binocular vision and coordination.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Abducens Nerve Function
The abducens nerve, also known as cranial nerve VI, is primarily responsible for controlling the lateral rectus muscle, which allows for the abduction of the eye. Damage to this nerve results in an inability to move the eye outward, leading to issues with lateral gaze.
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Functional Groups
Eye Movement Muscles
Eye movements are coordinated by six extraocular muscles, which include the lateral rectus, medial rectus, superior and inferior rectus, and superior and inferior oblique muscles. Each muscle has a specific role in moving the eye in different directions, and understanding their functions is crucial for diagnosing eye movement disorders.
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Neurological Implications of Nerve Damage
Damage to cranial nerves can lead to various neurological symptoms, including impaired movement and coordination. In the case of the abducens nerve, the resulting condition, known as lateral gaze palsy, can significantly affect a person's ability to track objects or maintain proper visual alignment.
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