Which statement about Müller glia is accurate?

Which statement about Müller glia is accurate?

• A. They transduce photoreceptor signals.
• B. They generate action potentials in retinal neurons.
• C. They primarily transport visual information to the brain.
• D. They provide structural support and help maintain retinal homeostasis.

Answer: (D)

Müller glia provide the supportive framework of the retina and keep the retinal environment stable so neurons can function properly. They span the entire retina, contact nearly every neuronal element, and regulate extracellular ion concentrations (notably potassium) to prevent fluctuations that could disrupt signaling. They clear neurotransmitters from synapses to prevent excitotoxic damage, help manage water and pH balance, support the blood-retinal barrier, and supply metabolic resources to neurons, including photoreceptors. This combination of structural support and homeostatic functions is their defining role, enabling retinal neurons to operate reliably. They do not transduce light signals themselves, nor do they generate action potentials in retinal neurons, and the visual information that we perceive is conveyed to the brain by retinal neurons—primarily retinal ganglion cells—through the optic nerve.

Müller glia provide the supportive framework of the retina and keep the retinal environment stable so neurons can function properly. They span the entire retina, contact nearly every neuronal element, and regulate extracellular ion concentrations (notably potassium) to prevent fluctuations that could disrupt signaling. They clear neurotransmitters from synapses to prevent excitotoxic damage, help manage water and pH balance, support the blood-retinal barrier, and supply metabolic resources to neurons, including photoreceptors. This combination of structural support and homeostatic functions is their defining role, enabling retinal neurons to operate reliably. They do not transduce light signals themselves, nor do they generate action potentials in retinal neurons, and the visual information that we perceive is conveyed to the brain by retinal neurons—primarily retinal ganglion cells—through the optic nerve.