All dictionaries, American and British, have used /ks/ for the transcription of 'cc' in the word ' buccinator'. However, l have noticed that some medical instructors use /ks/, others use /k/ and a few of them use /s/. My question is: is it correct to use /k/ and /s/. By the way, the medical instructors are native American and British.
As others have mentioned, different people pronounce words different ways. "Correct" is a matter of opinion. I like consistency, so I pronounce "flaccid" with /ks/ and "foci" with /s/, because these pronunciations seem most consistent to me with the pronunciations of other words, such as "success" and "acid." But many people pronounce "flaccid" with /s/, and many people pronounce "foci" with /k/.
Because medical or anatomical terms are often read before they are heard, many of them have odd pronunciation variants, like "me-DOO-la" for "medulla".
If you hear a certain pronunciation from your medical instructor, it indicates that probably nothing terrible will happen to you if you use that pronunciation. Probably, nothing terrible will happen to you if you use the dictionary pronunciation either.