descending reticular formation

The descending reticular formation, specifically the reticulospinal tracts, originates in the pons and medulla oblongata. These tracts are crucial for motor function, muscle tone, reflexes, and equilibrium.1

The reticulospinal tracts arise from the reticular formation, a network of nerve cells and fibers in the brainstem that also plays a role in consciousness and the sleep-wake cycle. There are two main reticulospinal tracts:21

• Pontine reticulospinal tract: This tract descends ipsilaterally and facilitates voluntary movements, muscle tone, and spinal reflexes.1
• Medullary reticulospinal tract: This tract descends in the ventral part of the lateral funiculus and inhibits motor activities that are facilitated by the pontine tract.1

Both tracts receive input from the motor cortex.1