ISOCAM IMAGES AT 6.75 MU-M AND 15 MU-M - THE CIRCUMNUCLEAR REGION OF NGC 4321 (M 100)

We present ISOCAM images (1.5 '' px(-1)) in the LW2 (6.75 mu m) and LW 3 (15 mu m) broad band filters of the circumnuclear starburst of NGC 4 321 (M 100). A detailed comparison with the emission at other waveleng ths (U, B, H alpha, and CO) is also presented. The nature and intensit y of the mid-infrared emission is shown to be remarkably different fro m one star forming region to the next. For instance, star forming regi ons at the ends of the nuclear bar may contain enshrouded Wolf-Rayet s tars.