Question 5 / 17:  Watch this video (http://openstaxcollege.org/l/occipital) to learn more about a transverse section through the brain that depicts the visual pathway from the eye to the occipital cortex.

The first half of the pathway is the projection from the RGCs through the optic nerve to the lateral geniculate nucleus in the thalamus on either side.

This first fiber in the pathway synapses on a thalamic cell that then projects to the visual cortex in the occipital lobe where "seeing," or visual perception, takes place.

This video gives an abbreviated overview of the visual system by concentrating on the pathway from the eyes to the occipital lobe.

The video makes the statement (at 0:45) that "specialized cells in the retina called ganglion cells convert the light rays into electrical signals."

What aspect of retinal processing is simplified by that statement? Explain your answer.

Answer: 
Photoreceptors convert light energy, or photons, into an electrochemical signal.

The retina contains bipolar cells and the RGCs that finally convert it into action potentials that

are sent from the retina to the CNS.

It is important to recognize when popular media and online sources oversimplify complex physiological

processes so that misunderstandings are not generated.

This video was created by a medical device manufacturer who might be trying to highlight other aspects

of the visual system than retinal processing.

The statement they make is not incorrect, it just bundles together several steps, which makes it sound

like RGCs are the transducers, rather than photoreceptors.

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Anatomy & Physiology 14 Brain & Cranial Nerves

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Attribution:  OpenStax College. Anatomy & Physiology, OpenStax-CNX Web site. http://cnx.org/content/col11496/1.6/, Jun 11, 2014
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