Vision

16″ x 20″

 

This is a depiction of the rods and cones of the eye; they are specialized neurons found in the retina that are responsible for vision. The human retina contains about 120 million rod cells and 6 million cone cells. Thesphotoreceptor cells convert light to electrical signals to send information to the occipital lobe of the cerebral cortex so that we can see. Rods are the most numerous photoreceptor cell, depicted here in black and white, are activated at very low light levels. Cones, depicted in colors, are responsible for color vision. Red cones are the most numerous, followed by green and then blue. Activation of cones requires significantly more light, and thus the reason we do not see color at night is that these photoreceptors are not activated. The signals from the rods and cones is transmitted through bipolar cells, depicted in the bottom of the picture, to the optic nerve. Pigmented epithelial cells, depicted on the top of the image, provide structure and nourishment to the photoreceptors.

Size 16″x20″

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Create a free website or blog at WordPress.com.

Up ↑

%d bloggers like this: