Which part of the brain is the endpoint of the optic nerve where images are processed?

The geniculate body, specifically the lateral geniculate nucleus (LGN) of the thalamus, serves as the primary relay center in the brain for visual information received from the retina via the optic nerve. This structure plays a crucial role in processing visual signals by organizing and transmitting them to the visual cortex in the occipital lobe of the brain, where further interpretation occurs. The LGN is responsible for integrating visual input and contributing to aspects like contrast, brightness, and color detection, making it essential for forming coherent visual perceptions.

The other options are not relevant in the context of processing images. The fibrous tunic refers to the outer layer of the eye, providing support and protection, while the neural tunic, or retina, is where phototransduction occurs and initial processing of visual information begins. The vitreous humor is the clear gel that fills the space between the lens and the retina, providing shape and support to the eye but does not play an active role in processing visual information. Thus, the geniculate body stands out as the correct answer due to its direct involvement in the processing and relay of visual data to the brain.