Final answer:
The striatum is the structure necessary for procedural memory.
Step-by-step explanation:
The structure necessary for procedural memory is the striatum. The striatum is part of the basal ganglia, a group of structures in the brain involved in movement, reward, and learning. It plays a key role in the formation and retrieval of procedural memories, which are memories of how to perform specific skills or tasks, such as riding a bike or playing a musical instrument.
The other structures mentioned in the options- the hippocampus, pararhinal cortex, inferotemporal cortex, and posterior parietal cortex- are not directly involved in procedural memory but have other functions in memory and cognition.