Before revision: Origin The definition of orthograde posture can easily be derived from its roots “ortho-” meaning “upright” and “-grade” meaning “ascent.” This was true for the early hominidae, whose transition to upright walking took place approximately six to seven million years ago evident in orrorin tugenensis.
After revision: Origin The definition of orthograde posture can easily be derived from its roots “ortho-” meaning “upright” and “-grade” meaning “ascent.” This was true for the early hominidae, whose transition to upright walking took place approximately six to seven million years ago evident in Orrorin tugenensis.