trochlear nerve.ppt

trochlear nerve
nucleus
nerve course
muscle supply

2. •1 Trochlear nerve nucleus
•2 trochlear nerve course
•3 supply to muscle

3. Presented to DR AFAQ AHMED
Presented by TAHREEM TARIQ
TROCHLEAR NERVE

4. INTRODUCTION
Itisthe4thcranialnerve.
NATURE
ItiscompletelyMotorinnature.

5. 1
TROCHLEAR NERVE NUCLEUS
oThe trochlear. Nerve Nucleus.
Is situated in the anterior part of the
Gray matter that surrounds the
cerebral aqueduct of the midbrain
oIt lies inferior to the oculomotor
nucleus at the level of inferior
colliculus

7. Slender
Decussates
Longest
intracranial
Post side of
Midbrain
Thenervefiberafterleavingthe
nucleuspassesposteriorlyaround
thecentralgreymattertoreach
theposteriorsurfaceofmidbrain.
Longestintracranialnerve
Properties.
.

8. 1 Corticonuclear fibers from the both
cerebral hemisphere
2 Tectobulbar fiber which connect it
visual cortex
3 Medial longitudinal fasciculus.
.
Received information.

9. 2
othe most slender of the cranial nerves and the
only one to leave the posterior surface of the
brainstem, emerged from the midbrain and
immediately decussates with a nerve of the
opposite side.
oThat passes forward through the medial cranial
fossa into the lateral wall of the cavernous sinus
and enters the orbit through the superior orbital
fissure.
Trochlear nerve course.

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11. 3
Nerve supply
The nerve supply to superior oblique muscle of the eyeball.
Function
The trochlear nerve is entirely mortar in nature and
assist in turning the eye downward and literally.

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13. Examination
To assess the trochlear nerve,instruct the patient to
follow your finger while you move it down toward his
nose
Thus, a trochlear nerve palsy causes anipsilateral
higher eye (i.e., hypertropia) and excyclotorsion
(the affected eye deviates upward and rotates
outward). Patients may report diplopia that is
usually worse on downgaze and gaze away from the
affected side

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15. THANK YOU