A part
筋
Shown as a part of 2 words so far, read 2 ways.
きん 1 word
- 筋肉きんにくmuscle, sinews
筋肉 · here “muscle; tendon”
すじ 1 word
- 大筋おおすじoutline, summary
大筋 · here “thread”
Also written with 筋
These words contain the character in their spelling but show no breakdown that names it, so nothing is claimed about its role in them.