What structures of the membranous labyrinth in the inner ear are involved in both dynamic and static equilibrium?

The membranous labyrinth of the inner ear plays a crucial role in the body's ability to maintain balance and equilibrium. Within this system, both static and dynamic equilibrium are important components of how we perceive our orientation and motion in space. The structures involved in these functions include the semicircular ducts, which detect rotational movements, and the saccule, which helps perceive linear acceleration and the position of the head relative to gravity.

The semicircular ducts are oriented in three planes and are specifically designed to sense changes in angular motion, contributing to dynamic equilibrium. Meanwhile, the saccule is involved in static equilibrium, responding to gravitational forces and linear movements. Together, these structures provide a comprehensive response to both types of equilibrium.

Therefore, recognizing that more than one structure participates in these functions justifies the selection of the answer indicating that multiple options are relevant. This reflects the complexity and interrelatedness of equilibrium mechanisms in the inner ear, reinforcing why the response includes the possibility of multiple correct structures within the membranous labyrinth.