Final answer:
The magnocellular pathway consists of a substantial but unspecified percentage of nerve fibers in the optic nerves, responsible for transmitting information about form, movement, depth, and luminance contrast. The parvocellular pathway transmits color and fine details. Information from both pathways can project directly to the brain or cross at the optic chiasma.
Step-by-step explanation:
The optic nerves are composed of myelinated axons of ganglion cells, which carry various types of visual information to the brain. Specifically, the magnocellular pathway is known for transmitting information regarding form, movement, depth, and luminance contrast. Although the exact percentage of nerve fibers that constitute the magnocellular pathway is not provided in the question, these fibers are a significant component of the visual system. Similarly, the parvocellular pathway is comprised of other axons that focus on transmitting color and fine detail in vision. Visual information can either project directly to the brain or cross at the optic chiasma, allowing for the coordination of information from both eyes.