In what plane does the falciform ligament extend?

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The falciform ligament runs along the midline on the anterior surface of the liver, attaching it to the anterior abdominal wall and the diaphragm. Because it sits in the midline and traces a path from the anterior wall toward the liver, its orientation aligns with the sagittal plane—the vertical plane that divides the body into left and right halves. The frontal (coronal) plane would split front from back, the transverse plane would split top from bottom, and an oblique plane would be slanted, none of which describe this midline, anterior course. A note: the inferior edge of the falciform contains the ligamentum teres hepatis, the remnant of the fetal umbilical vein.