occulomotor nerve

OCCULOMOTOR NUCLEUS

SITUATED IN VENTROMEDIAL PART OF GREY MATTER OF MIDBRAIN AT LEVEL OF SUPERIOR COLLICULUS

CILIARIS AND CONSRICTRICTOR PUPILLAE ARISES FROM EDINGER WESTPAL NUCLEUS VENTOMEDIALLY IT IS LOCATED TO MEDIAN LONGITUDINAL BUNDLE

COURSE

1. INTRANEURAL COURSE
IN INTRANEURAL COURSE FIBRES PASSESES THROUGH RED NUCLEUS SUBSTANTIA NIGRA TEGMENTUM ( R, S,T )

2. AT THE BASE OF SKULL FIBRES ARE ATTTACHED TO MEDIAL SIDE OF CRUS CREBRI

3. THE NERVE PASSES THROUGH SUPERIOR CEREBELLAR AND POST CEREBRAL ( LAST TWO BRANCHES OF BASILAR) THROUGH INTERPEDUNCULAR CISTERN REACHES LATERAL SIDE OF POST COMMUNICATING AND REACHES CAVERNOUS SINUS

IT ENTER CAVERNOUS SINUS THROUGH POST PART OF LATERAL OF ROOF OF CLINIOD PROCESS..
IT DESCEND TO LATERAL SIDE OF CAVERNOUS SINUS LIES ABOVE TROCHLEAR N..

IT DIVIDE INTO UPPER AND LOWER DIVISION

THESE DIVISION ENTER MIDDLE OF SUPERIOR ORBITAL FISSURE AND NASOCILLARY NERVE LIES IN B/W DIVISION AND ABDUCENT NERVE LIES INFEROLATERAL TO IT..

THE SMALLER LONGER DIVISION ENTER SUPPLY SUPERIOR RECTUS AND L.P.S

THE LONGER AND SMALLER DIVISION ENTER MIDDL RECTUS, INFERIOR OBLIQUE AND INFERIOR RECTUS…

CLINICAL ANATOMY

LATERAL SQUINT
DROOPING OF EYELID
PROPTOSIS
DILATION OF PUPI;L