Email Introductions Prior to Summer Internship

Hey all,

I received an email from the recruiter of the BB I will be interning at this summer. She basically told me what team I will be interning for and CC'd the senior analyst + his 2 associates in an email introduction. I was hoping to get some advice on email introductions since I'm not used to this sort of thing.

1) When I reply to the email, do I just reply to the senior analyst/associate individually or do I CC the recruiter as well? (i.e. "Thanks for the introduction, [Recruiter]." then roll into the email? Or should I just send a separate email to the senior analyst? If I go this route how do I even structure my email?) I'm leaning towards just sending emails to the senior analyst + 2 associates on an individual basis and not CC'ing anyone but I will copy the introduction email in my response. Thoughts?

2) What do I even say in an introduction email to the senior analyst + 2 associates? I imagine I keep it brief but do I try to set up a brief phone call prior to my start date? All the recruiter said was "Please feel free to reach out to [Senior Analyst] and his associates – Associate 1 and Associate 2 ahead of your start date (all of whom are CCed on this email)." Thoughts? Really appreciate the feedback as always guys!