Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

The ultrastructural changes of Eimeria brunetti which occur during microgametogony in the small intestine of the domestic fowl are described. The development of the trophozoite into the microgametocyte was accompanied by cytoplasmic growth and nuclear division. The developing microgametocytes could be differentiated from developing schizonts because of ultrastructural differences in both cytoplasm and nuclei. The surface area of the microgametocyte was increased by deep invaginations of the limiting membrane. At this developmental stage, the nuclei were situated adjacent to this membrane and protrusions which developed, initiated microgamete formation. Two centrioles were positioned between each nucleus and the limiting membrane and were transformed into the basal bodies of the flagella. The flagella grew out from the basal bodies which then entered the protrusions. A mitochondrion and the dense chromatin-containing portion of the nucleus also entered each protrusion. The microgametes matured while they were attached to the residual cytoplasm of the microgametocyte; they were finally budded off into the parasitophorous vacuole. The microgamete consists of an elongated nucleus which overlaps a mitochondrion towards the arterior of the cell. At this end, a dense plaque (perforatorium) is found together with the 2 basal bodies and their attached flagella. 5 microtubules were apparent and ran longitudinally from the basal body region. In cross section they were arranged in a row of 4 with 1 diagonally opposite; only 2 of these microtubules extended to the posterior tip of the microgamete.


Journal article


Acta Pathol Microbiol Scand B

Publication Date





67 - 77


Animals, Cell Nucleus, Cell Wall, Chickens, Cytoplasm, Eimeria, Intestine, Small, Microscopy, Electron