The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

The LOCUS of my identity
is totally exterior to me.
The Big Bang Theory Season 2, Episode 15

I'm about to remove
the LOCUS coeruleus,
The Big Bang Theory Season 5, Episode 16

they make fat jokes
about the LOCUS coeruleus.
The Big Bang Theory Season 5, Episode 16

I.e., when your LOCUS coeruleus
sits around the house,
The Big Bang Theory Season 5, Episode 16

Does a LOCUS coeruleus
normally bleed that much?
The Big Bang Theory Season 5, Episode 16