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18 Cards in this Set
- Front
- Back
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Extraocular muscles |
muscles of the eye that cause eyes to move within orbits |
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Internal ocular muscles |
muscles that control pupillary size and lens accommodation |
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pathways that involve the brainstem nuclei of CN III, IV, and VI; the peripheral nerves arising from these nuclei; and the eye movement muscles |
Nuclear and infranuclear pathways |
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pathways that involve the brainstem and forebrain circuits that control eye movements through connections with the nuclei of CN III, IV, and VI |
supranuclear pathways |
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How many extraocular muscles are in each eye and name then |
6; lateral rectus, medial rectus, superior rectus, inferior rectus, superior oblique, and inferior oblique |
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Which eye muscles move the eye laterally, medially, superiorly, and inferiorly as well as torsional |
lateral, medial, superior, and inferior rectus |
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Name the two extraocular muscles |
superior and inferior obliques |
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Superior oblique muscles are responsible for what type of movment |
intorsion or movement of the upper pole of they eye inward |
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Which muscle elevates the eyelid? |
levator palpebrae superior |
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Which muscle causes the pupil to become larger and smaller? |
pupillary constrictor and dilator muscles |
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Which muscle adjusts the thickness of the lens in responsive to viewing distance? |
ciliary muscles |
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What is the main action of the lateral rectus muscle and which cranial nerve is it innervated by |
abduction; abducens nerve (CN VI) |
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What is the main action of the medial rectus muscle and which cranial nerve is it innervated by |
adduction; oculomotor nerve (CN III) |
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What is the main action of the superior rectus muscle and which cranial nerve is it innervated by |
elevation and intorsion; oculomotor nerve (CN III) |
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What is the main action of the inferior rectus muscle and which cranial nerve is it innervated by |
depression and extorsion; oculomotor nerve (CN III) |
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What is the main action of the inferior oblique and what nerve is it innervated by |
elevation and extorsion; oculomotor nerve (CN III) |
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What is the main action of the superior oblique muscle and which nerve is it innervated by |
depression and torsion; trochlear nerve (CN IV) |
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