part of part of Homo sapiens reproductive structure muscle layer of oviduct circular muscle layer of muscular coat inner muscle layer of fallopian tube ampulla 2026-05-25T00:00:00Z A circular smooth muscle layer that is part of the muscle coat of the ampulla of the fallopian tube. This layer forms the innermost component of the muscularis and, together with the outer longitudinal layer, generates peristaltic contractions that facilitate oocyte and embryo transport through the ampullar region. Wikipedia:Fallopian_tube