High power TEM of the cytoplasm of a stage 1b embryo in vitro, 24 hours post-insemination (original magnification x22,250). Shown is a longitudinal section through a wavy part of the fertilizing sperm flagellum containing the axial filament complex (AFC).
From: Soupart and Strong, 1974. Reproduced with permission of the American Society for Reproductive Medicine.
Keywords: axial filament complex (AFC), cytoplasm, sperm flagellum, stage 1b embryo
Source: The Virtual Human Embryo.