Lame story, but while I’m reviewing my test, just in case it helps anyone else with flexor digitorum profundus vs. superficialis...
I was an anatomy fellow last summer and taught the PAs, OTs, PTs, etc in the cadaver lab. I dissected out the finger tendons and thought it was really neat how the flexor digitorum superficialis tendon split and the profundus tendon went through to the distal phalanx. I decided to demonstrate it to the students I was teaching by holding the cadaver’s arm up and holding the middle phalanx steady with my left hand, and then tracking that particular FDP tendon below the wrist and pulling on it with my right hand, making the distal phalanx wave at the students.
One of the students screamed. Like, actually screamed, in the middle of the cadaver lab, because she was so freaked out about the dead person’s finger waving at her.
and that’s how I will remember forever that flexor digitorum profundus moves the distal phalanx.