Star fish don't have eye spots, or eyes, they depend on their skin to detect light.
The oral side
mouth, madreporite, suckers
Jet turbine technology
A starfish
on the bottom of the star fish!!!!!!!
If you look beneath a starfish you will see a groove under each "arm", from the tip to the "mouth" in the centre. The grooves are lined with "feet", flexible, muscular tubes with suckers at their ends.The starfish can travel by sucking onto any convenient surface with the suckers and dragging themselves along. Actually when a starfish hatches from its egg, it also can swim or drift along in the sea water. You could call that travelling too.
It is located on the Aboral surface of the starfish (upper side), and it is sightly off centered, however not to be confused with the anus, the Madreporite is slightly larger than the anus.
a purposes of a star fish sucker is because it sucks on everything
They have special suckers on their body which cling to the rocks like suction cups.
The suckers
the ventral surface of a starfish is called oral You Jerk.
the nervous system
The lower surface of a starfish is technically called the ventral side. This is where both the mouth and stomach is located on the starfish.