Figure 3. Depiction of a Neurospora crassa hyphal apex and subapex with some of the components participating in polarized growth.

Vesicles move along microtubules or actin microfilaments, helped by motor proteins, to reach the Spitzenkörper (Spk). There, vesicles accumulate prior to fusing to the plasma membrane via exocytosis. At the subapex, an actin collar mediates endocytosis and recycling of important polarity factors. Some representative organelles are shown.