The phrase "a pertinent part" is correct and usable in written English.
It can be used when referring to a relevant or significant section of a text, discussion, or argument.
Example: "In our analysis, we found that a pertinent part of the report highlighted the need for further research."
Alternatives: "a relevant section" or "an important aspect".
Interesting that no one thought of bringing Mary into the central story as a scientist, which would be the pertinent part for her.
Section 102.168(3) states in pertinent part: The grounds for contesting an election under this section are: "Receipt of a number of illegal votes or rejection of a number of legal votes sufficient to change or place in doubt the result of the election".
In that article, he states in pertinent part as follows: "Worldwide, we humans share a curious, common, and overlooked propensity to automatically perceive many risks as greater or less than they actually are.
Herewith, a Diamond sampler: "State administrative Directive 94 ADM-20 states in pertinent part and I quote..."....
His violation of the order led U.S. Federal officials to initiate a warrant for his arrest upon completion of the match, citing, in pertinent part, "Title 50 USC §§1701, 1702, and 1705 and Executive Order 12810".
Nevertheless, Macy's CEO, Terry Lundgren, stated in pertinent part to "express personal opinions... is the nature of a free society".
The Constitution reads in pertinent part: "Each state shall appoint, in such manner as the Legislature thereof may direct, a number of electors".
Mr Brown's cure was effected because his bone marrow (and thus the pertinent part of his immune system, which HIV infects) was destroyed and replaced during a course of treatment for leukaemia.
Mr Brown's cure was effected, accidentally, because his bone marrow (and thus the pertinent part of his immune system, which HIV infects) was destroyed and replaced during a course of treatment for leukaemia.
The ruling National Congress Party has stalled on virtually every pertinent part of the peace agreement, and the national and local elections in April — which most international observers agree were stained by fraud — are a foreboding precedent.
