What type of neurons are primarily found in the DRG?

• A. Expiratory neurons
• B. Inspiratory neurons
• C. Mixed neurons
• D. Motor neurons

Answer: (B)

The correct answer is that the neurons primarily found in the Dorsal Root Ganglion (DRG) are sensory neurons. The DRG contains the cell bodies of sensory nerves that transmit information from the peripheral nervous system to the central nervous system. These sensory neurons are crucial for relaying various sensory information, including pain, temperature, and touch sensations.

In the context of respiratory physiology, inspiratory neurons are important for initiating the process of inhalation by sending signals to the diaphragm and intercostal muscles, but these neurons are typically located in areas such as the medulla and pons of the brainstem, rather than in the DRG. Consequently, the presence of mixed neurons or motor neurons in the DRG would not be accurate, as the DRG is primarily associated with sensory function. Therefore, while inspiratory neurons play a role in respiratory control, they are not predominantly found in the DRG.