Different kinds of placodes
lContributing to organs of special sense:
Olfactory
Lens (only placode that does not have neural fate)
Otic
lContributing to distal ganglia of branchiomeric nerves:
Trigeminal (Ophthalmic,V1)
Epibranchial (4)
lHypobranchial (2) (contribute to hypobranchial ganglia - frog only; not in chick, mouse, zebrafish)