Anatomy LE 6: Optic and Extraocular Motor Pathways
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Questions and Answers

What is the primary function of the pupillary light reflex?

  • To control the movement of the eyeball
  • To regulate blood pressure
  • To regulate the amount of light entering the eye (correct)
  • To focus on distant objects

    • Which structure is responsible for transmitting visual information from the eye to the brain?

  • Trigeminal nerve
  • Olfactory nerve
  • Optic nerve (correct)
  • Vagus nerve

    • What is the term for the movement of the eyes to focus on a single point?

  • Convergence (correct)
  • Saccadic movement
  • Smooth pursuit
  • Vergence

    • Which of the following is NOT a part of the visual pathway?

    <p>Cerebellum</p> Signup and view all the answers

    What is the name of the structure that connects the two optic nerves?

    <p>Optic chiasm</p> Signup and view all the answers

    Which of the following is responsible for regulating the size of the pupil?

    <p>Pupillary light reflex</p> Signup and view all the answers

    What is the term for the movement of the eyes to track a moving object?

    <p>Smooth pursuit</p> Signup and view all the answers

    What is the name of the structure that transmits visual information from the lateral geniculate body to the cortex?

    <p>Optic radiation</p> Signup and view all the answers

    Which part of the brain do the fibers turn towards in the afferent pathway for the pupillary light reflex?

    <p>Follicular midbrain</p> Signup and view all the answers

    Where do the fibers from the optic tract end?

    <p>Pretectal colliculus</p> Signup and view all the answers

    What type of fibers project from the pretectal nucleus to the Edinger-Westphal nuclei?

    <p>Pretectal neuron fibers</p> Signup and view all the answers

    What is the result of bilateral lesions in the visual cortex?

    <p>Complete blindness</p> Signup and view all the answers

    What is the result of the pupillary light reflex in the unstimulated eye?

    <p>Constriction</p> Signup and view all the answers

    What is the role of the Edinger-Westphal nuclei in the pupillary light reflex?

    <p>Controlling parasympathetic responses</p> Signup and view all the answers

    What type of visual field defect occurs when same regions of the fields of both eyes are involved?

    <p>Homonymous visual field defect</p> Signup and view all the answers

    Where do the postganglionic fibers from the ciliary ganglion innervate?

    <p>Sphincter pupillae</p> Signup and view all the answers

    What is the structure affected in Lesion D?

    <p>Optic tract or LGB</p> Signup and view all the answers

    What is the type of visual field defect in Lesion D?

    <p>Homonymous hemianopsia</p> Signup and view all the answers

    What is the result of the accommodation/convergence reflex?

    <p>Convergence of the eyes</p> Signup and view all the answers

    What is the function of the optic chiasm in the pupillary light reflex?

    <p>Allowing fibers to cross over</p> Signup and view all the answers

    What is affected in Lesion E?

    <p>Medial optic radiation/Cuneus</p> Signup and view all the answers

    What is the type of visual field defect in Lesion E?

    <p>Homonymous lower quadrantic anopsia</p> Signup and view all the answers

    Which pathways are interrupted in Lesion E?

    <p>Pathways from the upper temporal quadrant of the ipsilateral retina and upper nasal quadrant of the contralateral retina</p> Signup and view all the answers

    What is important to remember about Lesion E?

    <p>There is reversion and inversion of the lesion</p> Signup and view all the answers

    Where is the nucleus of the oculomotor nerve located?

    <p>At the level of the superior colliculus</p> Signup and view all the answers

    Which muscle is not supplied by the oculomotor nerve?

    <p>Lateral rectus</p> Signup and view all the answers

    What is the function of the Edinger-Westphal nucleus?

    <p>Supplies the ciliary muscle and sphincter pupillae</p> Signup and view all the answers

    Which cranial nerve is found at the posterior surface of the midbrain?

    <p>Trochlear nerve (CN IV)</p> Signup and view all the answers

    Which muscle is supplied by the trochlear nerve?

    <p>Superior oblique</p> Signup and view all the answers

    Where is the nucleus of the abducens nerve located?

    <p>At the floor of the 4th ventricle</p> Signup and view all the answers

    What is the action of the abducens nerve?

    <p>Horizontal gaze</p> Signup and view all the answers

    Which muscle is supplied by the abducens nerve?

    <p>Lateral rectus</p> Signup and view all the answers

    What is the purpose of the Doll's eye maneuver/reflex?

    <p>To check brainstem function for regulating eye movement</p> Signup and view all the answers

    What is the normal finding in the Doll's eye maneuver/reflex?

    <p>Head is rotated to the left, eyes must look at the right</p> Signup and view all the answers

    Which command center is associated with vertical saccade?

    <p>Rostral internucleus of MLF</p> Signup and view all the answers

    How is the visual field projected to the retina?

    <p>In an inverted and reversed manner</p> Signup and view all the answers

    What yoke muscles did the patient use when looking to the right and up?

    <p>L - Inferior Oblique, R - Superior Rectus</p> Signup and view all the answers

    What structure produces a blind spot in the visual field?

    <p>Optic disc</p> Signup and view all the answers

    What type of pupil does not react to light but reacts to accommodation?

    <p>Argyll Robertson pupil</p> Signup and view all the answers

    What reflex is responsible for ocular adjustment in response to head movement?

    <p>Vestibulo-ocular reflex</p> Signup and view all the answers

    What is the term for the movement of the eyes to focus on a single point?

    <p>Vergence</p> Signup and view all the answers

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