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The Phototransduction Cascade

The document outlines the phototransduction cascade in the retina, detailing the roles of various components such as opsin, retinal, and photoreceptors (rods and cones). It explains the conversion of light rays into electrical signals through processes involving neurotransmitters like glutamate and GABA, and highlights the differences between scotopic and photopic vision. Additionally, it mentions the significance of visual acuity and edge detection in the perception of light and color.

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Yash sangani
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75 views1 page

The Phototransduction Cascade

The document outlines the phototransduction cascade in the retina, detailing the roles of various components such as opsin, retinal, and photoreceptors (rods and cones). It explains the conversion of light rays into electrical signals through processes involving neurotransmitters like glutamate and GABA, and highlights the differences between scotopic and photopic vision. Additionally, it mentions the significance of visual acuity and edge detection in the perception of light and color.

Uploaded by

Yash sangani
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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all trans

op s i n
NEUROLOGY Light rays
11cis PDE melanin
all trans
outer pigmented layer of retina
op s i n
Transducion
Light Photoreceptors
PDE
RAY
11cis Photoreceptor
G.C. layer Transducion
C.GMP Rods Cones
GTP C.GMP C.GMP
gaba
Horizontal
gaba Glutamate glut process
Light C.GMP
cells Scotopic vision is Photopic vision
rays C.GMP the same
gaba
Glutamate Glutamate
* Dim light * Color vision
* Dark light ROY G BIV * Blue
Bipolar EPSP EPSP * Light in different * Red
hyperpolarization
cells shades of grey * Green
11-cis retinal (IPSP) - Color * Bright light vision
RoD * Visual acuity
No amacrine - Edge Detection
cells - Acuity *Edge detection
Light
tp.
Light G
EPSP rmp Glutamate Glutamate l
GABA
ycine *Pigment *Pigment
IPSP AP
Dopam
ACH i n e Rhodopsin Photopsin
Ganglian . AP Iodine
All-Trans time
cells .
Photopsin
Retinal Retinal Opsin

OPSIN Opsin

Glutamate optic nerve C.N.II


Special Senses | The Phototransduction Cascade

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