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.
A sensory nerve composed of the axons of the retinal ganglion cells in the eye. The nerve runs from the back of the eye, through the optic canal, and into the middle cranial fossa. In front of the stalk of the pituitary gland, the right and left optic nerves merge to form the optic chiasm.