Editing Rotifer (section)

=== Nervous system ===
Rotifers have a small cerebral ganglion, effectively its brain, located just above the mastax, from which a number of nerves extend throughout the body. The number of nerves varies among species, although the nervous system usually has a simple layout. <ref name=IZ/>

The nervous system comprises about 25% of the roughly 1,000 cells in a rotifer.<ref name="wallace" />

Rotifers typically possess one or two pairs of short [[antenna (biology)|antennae]] and up to five eyes. The eyes are simple in structure, sometimes with just a single [[photoreceptor cell]]. In addition, the bristles of the corona are sensitive to touch, and there are also a pair of tiny sensory pits lined by cilia in the head region.<ref name=IZ/>