Layers four and six (4 & 6) of the LGN also connect to the opposite eye, but to the P cells (color and edges) of the optic nerve. By contrast, layers two, three and five (2, 3, & 5) of the LGN connect to the M cells and P (parvocellular) cells of the optic nerve for the same side of the brain as its respective LGN.
A gyrus (gyri pl) is a rounded ridge, as on the surfaces of the cerebral hemispheres. A sulcus is a groove in the surface between gyri.
cerebral hemisphere one of the paired structures constituting the largest part of the brain, which together comprise the extensive cerebral cortex, centrum semiovale, basal ganglia, and rhinencephalon, and contain the lateral ventricle.See also brain.ymmetrical right and left halves of the cerebrum divided by the longitudinal fissure. cerebral peduncle. see cerebral peduncle. cerebral pia mater. thin connective tissue membrane that lies closely against the cerebral surface and carries blood vessels into the tissues of the brain.