Flashcards in Module 5: Ocular Motility & Disorders Deck (50)
Adducts the eye
Elevation of the eye is the primary action. Also adducts and intorts.
Abducts the eye
Depression of the eye is the primary action. Also adducts and extorts.
Depression of the eye is the primary action. Also abducts and intorts.
Elevation of the eye is the primary action. Also abducts and extorts.
Symmetrical or synchronous movement of the eyes
Movement of the eyes in opposite direction
The six recognized eye movement control systems
Vestibulo-ocular reflex, Optokinetic, Saccadic, Smooth pursuit, Fixation & Vergence "VOSS FV"
Controls the degree of convergence or divergence of the eyes, maintaining macular fixation no matter what the distance to the target.
Proper _______ of both eyes on the visual target permits fusion of both retinal images into one visual image.
Pathways mediate fixation and fusion
Retino-occipito-tegmental (ROT) and reticulo-occipito-fronto-tegmental (ROFT) pathways
Produces conjugate eye movements of equal magnitude but in the opposite direction to compensate for head movements in order to maintain foveation during motion of the head. Also called eye counterrolling.
Occurs in a comatose patient who cannot fixate.
Doll's eye maneuver
A positive doll's means that the ____________ is intact.
Vestibuloproprioceptive counterrolling reflex
Ensures that the fovea maintains fixation on the object of interest.
Supranuclear control of eye movements
Cortical areas involved in the generation of saccades
Supplemental eye field, Posterior eye field(parietal lobe) & Frontal eye field "SPF"
Controls horizontal saccades to the opposite side
Frontal Eye field
A prominent fiber tract that unites the oculomotor, trochlear and the abducens nuclei. Runs in the midline in the _________ of the brainstem.
Medial Longitudinal Folds. Dorsal tegmentum.
In MLF: crosses the ____, soon after beginning its ascent to the contralateral ______________.
Pons. Third nerve complex.
In MLF: coordinate movements of the _____, as well as head and eye, and even body movements.
Enumerate oculomotor pathways
Frontopontine, Medial Longitudinal Fasciculus, Parapontine Folicular "FMP"
Vertical gaze. Upgaze and downgaze pathways course in the:
Pretectum, Rostral midbrain & Posterior commissure
In vertical gaze, voluntary vertical movements are the simultaneous activity of both the
Frontal cortical eye fields
Types of peripheral part
Types of central part
Internuclear & Supranuclear
Involvements of peripheral disorder
Extraocular muscles, CN nuclei & CN fascicles "ECC"
CN IV: trochlear. Type of pathway
GSE: superior oblique
Contralateral MR does not receive a signal to contract. As a result, gaze to one side results in _______ of the eye ipsilateral to PPRF, with no _________ of contralateral eye.