Triplet contains one complete 13-protofilament microtubule (A tubule) and two additional tubules (B & C tubule) consisting of 10 protofilaments each.

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#Unit 7. System Physiology – Animal

There are two types of photoreceptors:

Rods 

Cones

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The neural elements of the retina are bound together by a type of glia called Müller cells

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Each rod and cone photoreceptor is divided into:

an outer segment

an inner segment 

a synaptic terminal zone

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The retina organized into layers: Outer nuclear layer contains the photoreceptors , rods & cones 

Inner nuclear layer contains the cell bodies of excitatory and

inhibitory interneurons including bipolar cells, horizontal cells, & amacrine cells

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Rods 

Have low acuity or resolution

are sensitive to low-intensity light

receptors for night vision (scotopic vision)

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Cones 

Higher visual acuity

responsible for vision in bright light (photopic vision) Participate in color vision