musculus serratus posterior vs serratus posterior

musculus serratus posterior and serratus posterior both are nouns.

Word	Noun	Adjective	Verb	Adverb
musculus serratus posterior	Yes	No	No	No
serratus posterior	Yes	No	No	No

As nouns, musculus serratus posterior and serratus posterior are synonyms defined as:

musculus serratus posterior and serratus posterior: skeletal muscle that draws the rib cage backward and downward

Other synonyms of musculus serratus posterior include posterior serratus muscle.

musculus serratus posterior (noun)	serratus posterior (noun)
skeletal muscle that draws the rib cage backward and downward	skeletal muscle that draws the rib cage backward and downward