Final answer:
The pons medulla is part of the floor of the fourth ventricle in the brain.
Step-by-step explanation:
The pons medulla is part of the floor of the fourth ventricle.
Within the brain, there are four ventricles that developed from the original hollow space within the neural tube. The fourth ventricle is located between the cerebellum and the pons and upper medulla. It opens into the subarachnoid space through the median and lateral apertures.
Therefore, the pons medulla is part of the floor of the fourth ventricle.