Here’s take II. I’ll post more as I encounter socially acceptable ones (not that many of these :/).

Two Zebras Bit My Cookies – Your head is a complicated place. All nerves lead to the brain, just as all roads lead to Rome. Here, however, it looks more like traffic in New York City Boston. Among the zigzaggy roads is the facial nerve, which is responsible for all the muscles of facial expression. Although it also has some funky side-roads, there are 5 main branches fanning out across the face from somewhere just south of each ear: Temporal, Zygomatic, Buccal, Mandibular, and Cervical.

C3,4,5 Keeps the Diaphragm Alive – As amazing a place as the head is, it wouldn’t be much without the lungs. And the lungs, well, they kinda need the diaphragm to do their job. The diaphragm is the big trampoline of muscle under your ribcage that pulls air in (and pushes it back out, if you’re panting). It’s innervated by the phrenic nerve, which comes from cervical (neck) vertebrae C3, C4, and C5. This is right above where the nerves to your arms come out, which is why some quadriplegics can still breathe on their own. It’s also why neck injuries are so dangerous; cut this puppy and you stop breathing.