Definition

Noun: A ganglion cell is a type of neuron (nerve cell) whose cell body is located outside the central nervous system (CNS), which consists of the brain and spinal cord. These cells are typically found in clusters called ganglia in the peripheral nervous system. A key example is in the retina of the eye, where retinal ganglion cells receive visual information from other retinal neurons and transmit it via their long axons to the brain.

Usage Examples

• Noun:
  • The optic nerve is formed from the axons of retinal ganglion cells.
  • Researchers are studying how ganglion cell loss contributes to certain neurodegenerative diseases.
  • Damage to specific ganglion cells can affect the perception of motion.

Advanced Usage

• "Retinal ganglion cell (RGC)": This is the most commonly referenced type. These cells are the final output neurons of the retina, integrating signals from photoreceptors (via intermediate cells) and sending action potentials to visual centers in the brain.
  • The death of retinal ganglion cells is a primary cause of vision loss in glaucoma.

Variants and Related Words

• Ganglion (n): A structure containing a collection of nerve cell bodies, often linked by synapses, located in the peripheral nervous system.
  • The dorsal root ganglion contains sensory neuron cell bodies.
• Ganglionic (adj): Pertaining to or of the nature of a ganglion.
  • The ganglionic layer of the retina.

Synonyms

• Ganglion neuron: A less common but technically accurate synonym.
• Nerve cell / Neuron: These are broader, more general terms. A ganglion cell is a specific type of neuron defined by its location.

Related Terms and Concepts

• Photoreceptor: A sensory cell in the retina (rods and cones) that responds to light, providing input to retinal ganglion cells.
• Optic nerve: The cranial nerve that carries axons from retinal ganglion cells to the brain.
• Glaucoma: A group of eye conditions often characterized by increased pressure that can damage the optic nerve, primarily by injuring retinal ganglion cells.

Noun

1. a nerve cell whose body is outside the central nervous system
   • damage to ganglion cells in the retina may play a role in the development of glaucoma