Are there more than one afferent neuron that will send a message to the brain?

Yes, more than one afferent neuron can send a message to the brain.

Afferent neurons, also known as sensory neurons, are responsible for transmitting sensory information from the peripheral nervous system to the central nervous system, specifically the brain and spinal cord. When a sensory receptor is stimulated, it generates a signal that is transmitted through the afferent neuron to the brain, where it is processed and interpreted.

Each sensory receptor is typically innervated by multiple afferent neurons, forming a sensory unit. These neurons are responsible for detecting different aspects of the sensory stimulus and transmitting this information to the brain. For example, in the case of the skin, there are different types of afferent neurons that respond to specific sensations such as touch, pressure, temperature, and pain.

Therefore, when a sensory receptor is stimulated, multiple afferent neurons can be activated, each carrying a specific aspect of the sensory information to the brain. This allows the brain to receive and process a comprehensive representation of the sensory environment.