They are of two kinds (1) simple tubular glands resembling those of the pyloric end of the stomach, but with short ducts.

If you cut, with a sharp knife, one of the florets of a cauliflower and look at it separately, you think of a whole cauliflower, but smaller.

Following the release of the first consumer 4 channel hi fi systems, a number of popular albums were released in one of the competing four channel formats among the best known are Mike Oldfield's Tubular Bells and Pink Floyd's The Dark Side of the Moon .