An antibiotic shot in The deltoid region

A nurse informed John that she was about to take blood from his antecubital region. What part of his body was she referring to? Later, she came back and said that she was going to give him an antibiotic shot in the deltoid region. Did he take off his shirt or drop his pants to get the shot?

Before John left the office, the nurse noticed that his left sural region was badly bruised. What part of his body was brusied?