What is the largest single cell?

The largest cells found in nature are ostrich eggs. Before fertilization, the entire interior of the egg consists of a single cell, which can weigh up to 5 pounds. The largest single-celled organism is an animal called Syringammina fragilissima, which can grow to a width of 4 inches.

The cells of Syringammina fragilissima are highly folded, forming a complex network of tubes. They contain multiple nuclei to deal with the problem of intracellular communication over such a large distance. The cells of the bubble algae, or Ventricaria ventricosa, are among the largest plant cells at 2 inches wide. The largest cells in the human body are axons located in the anterior horn of the spine.