triceps brachii vs musculus triceps brachii

triceps brachii and musculus triceps brachii both are nouns.

Word	Noun	Adjective	Verb	Adverb
triceps brachii	Yes	No	No	No
musculus triceps brachii	Yes	No	No	No

As nouns, triceps brachii and musculus triceps brachii are synonyms defined as:

triceps brachii and musculus triceps brachii: the skeletal muscle having three origins that extends the forearm when it contracts

triceps brachii (noun)	musculus triceps brachii (noun)
the skeletal muscle having three origins that extends the forearm when it contracts	the skeletal muscle having three origins that extends the forearm when it contracts