Retinogeniculostriate Pathway

Visual System: Visual Pathway

Central darker circle represents macular zone

Lightest shades represent monocular fields

Each quadrant a different color

Calcarine fissure

Occipital Lobe Structure

Projection on right dorsal lateral geniculate nucleus

Projection on left occipital lobe

Projection on right occipital lobe

Periphery Macula Structure of retina (schematic):

A Amacrine cells Projection °n left B Bipolar cells C Cones G Ganglion cells H Horizontal cells P Pigment cells R Rods

Projection on right dorsal lateral geniculate nucleus

Calcarine fissure

Projection on left occipital lobe

Projection on right occipital lobe

Figure 2.33 Retinogeniculostriate Visual Pathway

The retina has two types of photoreceptors: cones that mediate color vision and rods that mediate light perception but with low acuity. The greatest acuity is found in the region of the macula of the retina, where only cones are found (upper left panel). Visual signals are conveyed by the ganglion cells whose axons course in the optic nerves. Visual signals from the nasal retina cross in the optic chiasm while information from the temporal retina remains in the ipsilateral optic tract. Fibers synapse in the lateral geniculate nucleus (visual field is topographically represented here and inverted), and signals are conveyed to the visual cortex on the medial surface of the occipital lobe.

Auditory System: Cochlea

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