Neither I nor Jimi have EVER talked about “through” and “a part of” when discussing with you that nerves are indeed in bones.
YOU decided to try that spin after your claims (including the one “told” to you by a doctor) were proved wrong multiple times over with proof including that from anatomy textbooks, medical texts, and photographs. You even posted your own drawings that proved you wrong.
A car goes “through” the Holland Tunnel, but during the journey it is “in” the tunnel.
It doesn’t become “part of” the tunnel unless the tunnel collapses and it never gets dug out.
The nerves are considered “in” the bone even if only passing “through” it, they are “part of” the body.
The term “in” is used in the same vernacular for this discussion as it is used in common English writings and discussion. There is no special twist applied for medical terminology, there is no semantics trick bring parlayed to make you seem ignorant.
I even used it twice a sentence ago because it is so damn common.