The process of mastication affords a good example of the reference of sensations to and beyond the periphery of the body.

Vessels or nerves carrying the contents or impulses from the periphery to the center.

The ramifications are lost in the periphery amid fine granulations that resemble spores.

In the Polyps the plan is executed in the simplest manner by a sac, the sides of which are folded inward, at regular intervals from top to bottom, so as to divide it by vertical radiating partitions, converging from the periphery toward the centre.