Ch. 15 The Special Senses

Amerman - Human Anatomy & Physiology 2nd Edition

Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook

Amerman 2nd Edition

Ch. 15 The Special Senses

Problem L2.2

Chapter 15, Problem L2.2

In which direction would you be unable to move your right eye if your right abducens nerve were damaged?

Verified step by step guidance

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.

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.

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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Why do you have the sensation that you are still spinning immediately after stopping?

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Textbook Question

If a patient suffers visual impairment only in one eye, why must the damage be located in the visual pathway prior to the optic chiasma?

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Textbook Question

1. Match the cell type with the correct stimulus.

_____Rod or cone

_____Hair cell in cochlea

_____Gustatory cell

_____Olfactory neuron

_____Hair cell in vestibule

a. Head movement

b. Odorant

c. Photon

d. Taste substance

e. Sound wave

Textbook Question

Explain what would happen to your sense of smell if there were no basal cells present in the olfactory epithelium.

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Textbook Question

Following a stroke, a patient lost vision in the left visual field. Name several structures in the brain that could have been damaged by the stroke to have caused this vision loss. Be specific as to right or left side.

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Textbook Question

The axons of the olfactory nerve terminate in the:

a. Olfactory epithelium

b. Olfactory bulb

c. Olfactory tract

d. Primary olfactory cortex

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