Fig. 6. Models for oocyte-driven actin-dependent proximal streaming in C. elegans. Gray arrows indicate direction of cytoplasmic streaming into enlarging oocytes (blue outline). (A) Cortical contraction (green arrows) generates reciprocal cytoplasmic flow. (B) Particle transport along oriented actin cables (green). (C) Expansion of cortical surface. (D) Contractile actomyosin network at the entrance to an oocyte linked to a stable interior meshwork.