Where does “olkapäälihas” come from?

olkapäälihas (Finnish) comes from Finnish lihas, from Finnish -s, from Proto-Finnic -nci, from Proto-Uralic -mte.

Ancestry of “olkapäälihas”, step by step

olkapäälihas traces back through two separate lines of ancestry.

via Finnish lihas

StepLanguageWordMeaning
1Finnishlihasmuscle
2Finnish-sForms ordinal numbers from cardinal numbers, or...
3Proto-Finnic-nciForms ordinal numbers from the corresponding...
4Proto-Uralic-mte

via Finnish olkapää

StepLanguageWordMeaning
1Finnisholkapääshoulder
2Finnishpäähead; end, tip
3Proto-Finnicpäähead
4Proto-Uralicpäŋehead
Every word from Proto-Uralic -mteEvery word from Finnish -sEvery word from Proto-Finnic -nci