What is cord tissue?

The term "cord tissue" refers to the rest of the umbilical cord, other than the blood. A normal umbilical cord contains two arteries, one vein, an outer skin, and it is filled with a gelatinous material called Wharton’s Jelly.  Umbilical cords can vary widely in length, but the average cord is about 61 cm (24 inches) long and weighs 40 gm.

Reference:
Percy Malpas 1964; British Medical Journal 1:673–674.