EOM structure and features
True or false: EOMs have denser blood supply and more fibers per motor unit than skeletal muscle
False
EOMs have fewer fibers per motor unit
Intersect at the center of rotation of the eye?
Fick's Axes
What is the direction of movement referenced from?
Rotations around the sagittal axis (y-axis)?
Torsions (cyclorotations)
Version of eye moving right
Dextroversion (right gaze)
Allow for precise fine motor control?
EOMs
X-axis
Adduction (z-axis)
Torsional movement towards the nose?
Intorsion (incyclorotation)
Version of eye moving left?
Levoversion (left gaze)
Provides platform for high velocity, accurate ocular movements?
EOMs
Anterior to posterior pole axis?
Y-axis
Eye moves away from the midline (temporal)?
Abduction (z-axis)
Torsional movement away from the nose?
Extorsion (excyclorotation)
Version of eyes moving up?
Supraversion (up gaze)
Quick, jump movements?
Saccades
Superior to inferior axis?
Z-axis
Eye moves up?
Version of eyes moving down?
Infraversion (down gaze)
Slow, smooth following movements?
Pursuits
Monocular eye movements?
Ductions
Eye moves down?
Infraduction (depression) (x-axis)
Binocular, disjunctive (non-parallel) eye movements
Vergences
Convergence