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.
In this way, the brain merges all of the data concerning the same side of the body together in the optic chiasma to form an optic tract, which travels from the chiasm to the visual centers of the brain. Compression by a tumor or disruption of blood flow to the area may damage the optic chiasma.