Maverick County Courthouse, Eagle Pass, Texas 188/254 âThe Rio Grande forms Maverick Countyâs western and international border with Mexico; the county is bordered on the north by Kinney County, on the east by Zavala County, and on the south by Webb County.
The function of the optic chiasma  is to relay electric signals as they pas â¦ s from the optic nerve to  the brain.
The optic nerve is a motor nerve that connects the retina of the eye with the brain. This nerve penetrates the choroid and the sclera from the rear of the eye at the optic disc where it is met with the other optic nerve to form the optic chiasma.