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Normal function and Movements of the Eye
Learning Objectives:
Crainal Nerve VI: Abducens Nerve
1. Identify Cranial Nerve Function and Course with relation to the Eye
2. Learn the reflexes involving the ocular cranial nerves
Function: Innervation of the Lateral Rectus EOM; Abducts the eye
Course: Immediatly below the pons at the Pontomedullary junction, the nerve then passes through the cavernous sinus and finally enters the superior orbital fissure.
Reflexes: Contralateral Gaze
(2:30)
CN III: Oculomotor Nerve
References
Function: Nerve innervated the EOM of the eye including: Medial rectus, Inferior rectus, Superior rectus, Inferior Oblique and Levator palpbrae
Course: Axons from the cells of the Oculomotor nucleus pass anterior through the Red nucleus and leave the ventral midbrain near the midlline. The thrid nevre than passes through the superior orbital fissure
Reflexes: Pupillary light Reflex, Accommodation-convergence reaction
1. Kaplan Step 1 review books
Crainal Nerve IV: Trochlear Nerve
Function: Innervates the Superior Oblique EOM; Intorsion and Depression of the eye
Course: The trochlear nerve emerges from the dorsal aspect of the brain stem at the level of the caudal mesencephalon, just below the inferior colliculus. It circles anterior around the brain stem and runs forward toward the eye in the subarachnoid space and through the Superior Orbital fissures