Telomeric clustering on nuclear envelope called as the “bouquet” stage of meiosis, and represents a once-in-a-lifecycle configuration.

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#Unit 7. System Physiology – Animal

The sensory receptors for vision are photoreceptors, located on the retina.

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#Unit 7. System Physiology – Animal

There are two types of photoreceptors:

Rods 

Cones

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#Unit 7. System Physiology – Animal

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

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#Unit 7. System Physiology – Animal

Each rod and cone photoreceptor is divided into:

an outer segment

an inner segment 

a synaptic terminal zone

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#Unit 7. System Physiology – Animal

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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#Unit 7. System Physiology – Animal

Rods 

Have low acuity or resolution

are sensitive to low-intensity light

receptors for night vision (scotopic vision)