Grammar comes form a greek word and it is used to reference the set of rules and structure that give form to a written or spoken language that maje the language what it is, it involves the rules, clauses and composition of phrases of a natural language, that is why you would say that it si grammar what makes a language systematic.
Explanation: This is because the hippocampus is located in the forebrain section called the telencephalon and the hippocampus is responsible for the formation of long-term and spatial memories.