Which statement about retinal neuroglial cells is NOT true?

• A. They provide structural support to the retina
• B. They provide nutrients to the retina
• C. They are imperative in signal processing during phototransduction via neurotransmitter release
• D. Müller cells are the most common neuroglial cells found in the retina

Answer: (C)

Retinal neuroglial cells mainly provide structural and metabolic support to neurons in the retina. Müller cells, in particular, are the most abundant glial cells in the retina and help maintain the retinal environment by buffering ions, recycling neurotransmitters, and supplying metabolic substrates to neurons, thereby supporting normal retinal function.

The essential signal that carries visual information starts in the photoreceptors, where light is converted into an electrical signal, and then is transmitted through neuronal synapses. Glial cells influence the environment and can modulate signaling, but they do not drive the primary neurotransmitter release that underpins phototransduction. The crucial neurotransmitter release events that propagate the visual signal are neuronal, not glial.

So, the statement asserting that retinal neuroglia are imperative in signal processing during phototransduction via neurotransmitter release is not true.