Beneath the anterior parts of the radula where it emerges from the caecum are a pair of cartilages, and attached to these a number of special muscles by which the radula is moved backwards and forwards to act as a rasp. The secretion of the radula at the closed end of the caecum is continuous, so that it is constantly growing forward as fast as its exposed anterior portion is worn away by use, just as a fingernail is pushed forward by constant growth at its posterior end, and is worn away or has to be cut short from time to time at its outer end.
First, you gather the pillowcase up in your hands, decreasing the amount of space between the case's entrance and its closed end.
There is a flexible ring at the closed end of the thin, soft pouch of the female condom.
The ring at the closed end holds the condom in place in the vagina.
The closed end is therefore a node.