IV couple block nerves

Trochlear nerve (N. trochlearis) motor, fiber to start a nucleus in the ventral gray matter of the brain water at the lower midbrain colliculus. Thin nerve trunk sent to the dorsal side of the midbrain, and in the area between the lower colliculus of the midbrain and the start of the bridle anterior cerebral sails right and left nerves cross. Originally based on the brain trochlear nerve with the lateral side skirts the foot of the brain, being covered with temporal lobe. Reaching the base of the skull, it is located in the lateral wall of the cavernous sinus (Fig. 510). Through the upper orbital fissure trochlear nerve enters the eye socket, which is higher than the start of erector muscle of the upper eyelid, and enters into the upper oblique muscle of the eye. In this eye-socket connected afferent nerve-proprioceptive — fibers from nosoresnichnogo nerve and sympathetic fibers from vegetative plexus of the ophthalmic artery.
Embryogenesis. At the 4 th week of fetal middle cerebral neuroblasts bubble isolated in the basal plate of the midbrain. On the 5th week nerve directed to the dorsal side of the midbrain, where overlaps between the middle and posterior brain. Then, rounding the average brain the lateral aspect, is directed to the II miotomu upon which the superior oblique muscle of the eye.
Phylogeny. All vertebrates trochlear nerve innervate the upper oblique muscle.

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