Neuroanatomy Draw It To Know It

23. Eye Movements 419

DRAWING 23-4 Vertical Saccades

MIDBRAIN

PONS

LEFT RIGHT

riMLF*

INC*

Oculomotor

complex

Trochlear

nucleus

INC* - interstitial

nucleus of Cajal

Nucleus raphe

interpositus

Excitatory

burst

neurons

Neural

integrator

Omnipause

neurons

Nucleus raphe

interpositus

NUCLEUS FUNCTION

riMLF projects bilaterally for upgaze

riMLF projects ipsilaterally for downgaze

VERTICAL SACCADES

TORSIONAL SACCADES

From subject’s point of view, the right riMLF

produces clockwise saccades; the left riMLF

produces counterclockwise saccades

riMLF* - rostral

interstitial nucleus

of medial longitudinal

fasciculus

Inhibitory burst

neurons

SUPRA-OCULAR PROJECTIONS

riMLF receives ipsilateral projections from the

frontal eye fields and superior colliculus

(INC* or riMLF*)