Biology of Photoreceptors and Retinal Pigment Epithelium
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Questions and Answers

What is the function of melanozymes in the RPE?

  • Phagocytosis of photoreceptor outer segments (correct)
  • Absorbing photons of light
  • Synaptic transmission between photoreceptors and bipolar cells
  • Transport of ions, water, and metabolites between the choroid and retina

What is the approximate number of rods in the human retina?

  • 200 million
  • 6-8 million
  • 300 million
  • 120 million (correct)

What is the function of the photoreceptor layer?

  • To produce melanozymes
  • To absorb photons of light (correct)
  • To transmit light signals to the brain
  • To regulate ion transport

What is the shape of the photoreceptors in the photoreceptor layer?

<p>Spherical (B)</p> Signup and view all the answers

What is the function of the cilium in photoreceptors?

<p>To connect the outer segment to the inner segment (D)</p> Signup and view all the answers

What is the function of the disk lamellae in rod outer segments?

<p>To store photopigments (D)</p> Signup and view all the answers

What is the function of the triad-type synapse in cone pedicles?

<p>To connect photoreceptors to bipolar cells (C)</p> Signup and view all the answers

What is the approximate number of cones in the human retina?

<p>6-8 million (A)</p> Signup and view all the answers

What type of cells project to the magnocellular layer of the LGN?

<p>Ganglion cells (D)</p> Signup and view all the answers

Which of the following layers is absent over the optic disc?

<p>Internal limiting membrane (A)</p> Signup and view all the answers

What type of cells provide structure, support, and protection to the retina?

<p>Neuroglial cells (D)</p> Signup and view all the answers

What is the primary function of the photopigment molecules in the photoreceptor outer segment?

<p>To absorb light (C)</p> Signup and view all the answers

Which layer starts peripherally around the fovea?

<p>Nerve fiber layer (A)</p> Signup and view all the answers

What is the function of the papillomacular bundle?

<p>Carries signals from the macula to the optic disc (A)</p> Signup and view all the answers

What is the approximate number of lipid bilayered discs in the outer segment of a rod or cone cell?

<p>500-1000 (D)</p> Signup and view all the answers

Which region of the photoreceptor inner segment is involved in metabolic activity and photopigment synthesis?

<p>Ellipsoid region (C)</p> Signup and view all the answers

What type of cells have a role in signal processing?

<p>Ganglion cells (B)</p> Signup and view all the answers

Where are the axons of ganglion cells collectively found?

<p>Optic nerve (D)</p> Signup and view all the answers

What is the function of the cilium in the photoreceptor cell?

<p>To transport photopigment molecules to the outer segment (C)</p> Signup and view all the answers

What is the purpose of Müller cells in the retina?

<p>To provide structure and support (B)</p> Signup and view all the answers

What is the name of the region in the photoreceptor inner segment where mitochondria is found?

<p>Myoid region (D)</p> Signup and view all the answers

What is the primary function of the outer nuclear layer in the retina?

<p>To transmit visual signals to the brain (A)</p> Signup and view all the answers

What is the name of the lipid bilayered structure that surrounds the photopigment molecules in the outer segment?

<p>Discs (B)</p> Signup and view all the answers

What is the name of the structure that connects the photoreceptor inner segment to the outer segment?

<p>Connecting cilium (A)</p> Signup and view all the answers

What is the primary function of the macula lutea?

<p>To see color and detail (B)</p> Signup and view all the answers

What is the purpose of the xanthophyll pigments, lutein and zeaxanthin?

<p>To absorb short wavelength visible light and reduce chromatic aberration (D)</p> Signup and view all the answers

What is the approximate diameter of the macula lutea?

<p>5.5 mm (B)</p> Signup and view all the answers

What is the characteristic of the foveal avascular zone?

<p>A region entirely free of capillaries (C)</p> Signup and view all the answers

What is the primary function of the fovea?

<p>To facilitate discrimination of detail and color vision (D)</p> Signup and view all the answers

What is the diameter of the foveola?

<p>0.35 mm (D)</p> Signup and view all the answers

What is the characteristic of the cone photoreceptors in the foveola?

<p>A high concentration of cones (A)</p> Signup and view all the answers

What is the region of best visual acuity?

<p>The foveola (C)</p> Signup and view all the answers

What is the primary function of the Outer Plexiform Layer?

<p>Facilitating the first synapse in the visual pathway (A)</p> Signup and view all the answers

What is the difference between rod spherules and cone pedicles?

<p>Cone pedicles are larger than rod spherules (B)</p> Signup and view all the answers

What is the purpose of Henle's fiber layer?

<p>Supporting the macular area (D)</p> Signup and view all the answers

What type of synapses do rod bipolar cells form with rods and cones?

<p>Invaginating synapses (B)</p> Signup and view all the answers

What is the function of horizontal cell processes in the Outer Plexiform Layer?

<p>Both A and B (D)</p> Signup and view all the answers

What is unique about the Outer Plexiform Layer in terms of blood supply?

<p>It is the only layer that receives blood supply from both the choroid and retina (D)</p> Signup and view all the answers

What is the primary difference between the external and internal bands of the Outer Plexiform Layer?

<p>The external band is composed of inner fibers of rods and cones, while the internal band is composed of synapses (C)</p> Signup and view all the answers

What type of synapses do flat cone bipolar cells form with cone pedicles?

<p>Flat synapses (B)</p> Signup and view all the answers

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