Science Quiz / Eye Movements and the Retina

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QuestionAnswer
lesion to the MLF. eye ipislateral to lesion cannot adduct. contralateral eye can abduct with nystagmus
occurs when eyes smoothly pursue one target then quickly saccade to pick up the next target (allows us to pick up sequential moving targets
connections between the LGN and the primary visual cortex are known as what?
these photoreceptors are able to function under low light conditions
Which vestibular nucleus is involved in sending tonic signals to the abducens nerve and midbrain vertical eye network for the vestibulo-ocular reflex?
True or False: The smooth pursuit initiated in the left hemishere of the cerebrum controls smooth pursuit to the left.
A lesion to what structure would cause a gaze palsy ipsilateral to the affected side that can be overcome by the vestibulo-oculomotor reflex.
this extraocular muscle moves the eye medially
quick darting conjugate movements that move the eyes to new targets
this extraocular muscle moves the eye down and in... intorsion
Voluntary saccades are controlled by what brodmann's area?
the smooth pursuit in the optokinetic reflex is initiated by the ______ exciting the ipsilateral PPRF
lesion in the right abducens nucleus would cause an inability for a patient to gaze to the right, but would the patient still be able to accommodate or converge on a close object?
Lesion in the left frontal eye field would cause an inability to gaze in what direction?
this extraocular muscle moves the eye down
signals from the Left frontal eye fields project to the ___ parapontine reticular formation
Palsy of what nerve is characterized by the inabilty of eye to intort or depress when adducted.
The inability to look in one direction
True or False: Fibers that represent the most peripheral portions of the retina represent the most posterior portion of the calcarine cortex.
True or False: If the tonic inhibition of the ipsilateral abducens nucleus by the medial vestibular nucleus decreases that will cause the eye to deviate to the side contralateral t
A turn of the head to the right, will activate the _____ abducens nuclei, producing a gaze contralateral to the rotation.
slow conjugate movement of the eye which allows for tracking of a moving object or of a stationary object while we are moving
True or False: Signal to the right abducens nucleus induces contraction of the right lateral rectus and co-contracture of the left medial rectus via the MLF.
lesion in the left PPRF would cause an inability to gaze in what direction?
a disconjugate movement of both eyes toward the midline to allow for focusing on a near object
both eyes moving in the same direction is known as ____ movement
this syndrome is characterized by the ability to only abduct the eye contralateral to the lesion
QuestionAnswer
disconjugate gaze causes double vision also known as ______.
this extraocular muscle moves the eye up
true or false: the ciliary muscle contracts to release tension on the lens, making it more round, enabling it to focus on closer object
Patients with Cranial Nerve ___ palsy tend to lean away from affected side to regain conjugate gaze.
drooping of the eyelid is known as what?
accomodation and the pupillary reflex are produced by neurons in what nucleus?
Lesion to CN VI is characterized by the loss of ____ of the ipsilateral eye
most sensitive portion of the retina
this extraocular muscle moves the eye laterally
True or False: a lesion to the abducens nucleus results in a gaze palsy to the ipsilateral side that can be overcome by the vestibulo-oculomotor reflex
clinical term for lazy eye... can cause blindness in one eye because the person only uses one eye
axons of what cells form the optic nerve?
the point at which the axons of the retinal ganglion cells coalesce to form the optic nerve is known as the ____, because it has no photoreceptors.
true or false: the photoreceptors of the eye form the most superficial layer of the retina
the combination of ocular vergence, accomodation, and pupullary constriction is known as what?
What reflex is responsible for changing position of the eyes and maintaining vision throughout the movement of the head?
the saccade back to the next target in the optokinetic reflex is initated by the _____ activating the contralateral PPRF
True or False: Fibers from the lower part of the retina that subserve the superior visual field course anteriorly into the temporal lobe, as Meyer's Loop, before heading back to th
Palsy of what nerve is characterized by the affected side looking down and out
which nerve is susceptible to compression through increased intracranial pressure?
voluntary _____ originates in the angular gyrus
involuntary saccades to elementary stimulus are controlled by what structure?
central most sensitive part of the macula, the area of highest visual acuity
this extraocular muscle moves the eye up and out... extorts
this syndrome is characterized by an up-gaze palsy, light near dissociation, and convergence-retraction nystagmus. Commonly caused by Pineal gland
parasympathetic fibers controlling the pupillary sphincter originate where?
The mapping of the retina onto the calcarine cortex is known as ______ mapping.

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