Attraction Sphere

At*trac"tion sphere.

1. (Zoöl.)

(a) The central mass of the aster in mitotic cell division; centrosphere.

(b) Less often, the mass of archoplasm left by the aster in the resting cell.

2. (Bot.) A small body situated on or near the nucleus in the cells of some of the lower plants, consisting of two centrospheres containing centrosomes. It exercises an important function in mitosis.