One important factor in acountryâs population density is its area. SouthAmerican countries, with their relatively largeland areas, tend to have low population densities.In Ecuador, the most densely populated country inSouth America, an average of only 118 peopleshare a square mile (46 people per sq. km).
Trochlear nerve: The nerve that controls the superior oblique muscle of the eye, one of the muscles that move the eye (extraocular muscles). Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, in double vision).The trochlear nerve is the fourth cranial nerve, and it is the only cranial nerve that arises from the back of the brain stem.aralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, in double vision). The trochlear nerve is the fourth cranial nerve, and it is the only cranial nerve that arises from the back of the brain stem.
Cranial Nerve IV: The Trochlear Nerve Stemming from the lateral superior margin of the left and right side of the pons, exiting the skull through the superior orbital fissure and terminating in the superior oblique eye muscle, this nerve motorically governs the abduction, depression and internal rotation of the eye.