After the nerve turns to run on the aboral side there is no change in arrangement until the region of the tube feet is reached.

The pyloric end of the stomach exhibits strong peptonizing powers and much of the hydrolysis of protein takes place here

Note the large stomach-cavity, surrounded by the digestive gland.

The ampullae were tore and egg clutches were released into a single fertilization dish and then the thawed sperm were added

But the water doesn't flow freely in and out, it flows in and out through a valve, which is the madreporite

Both bipinnaria and brachiolaria larvae are bilaterally symmetrical.

In both these species the skin gills distinctly touch and grow on to the stem.

The cardia is the first part of the stomach, which is connected to the esophagus

The left side of the larval body becomes the oral surface of the juvenile and the right side the aboral surface

The radial canals are represented by wide gastric pouches, and may be absent, so that the tentacles arise directly from the stomach

Other connecting branches with the medial brachial cutaneous and radial nerve have also been described

The cavity of the diverticula after the separation of the water-vascular system, forms the body-cavity.

In the ossicles, the atomic pattern and the diamondlike lattice align in a way that compensates for calcite's intrinsic weakness

The Starfish's tube-feet try to pull the shells apart.

Birds are known to attack eyespots or head-shaped patterns on butterfly wings.