Final answer:
The gelatinous structure is called the cupula, which is located in the semicircular canals and plays a crucial role in the sense of dynamic equilibrium and balance.
Step-by-step explanation:
The bending of the gelatinous structure called the cupula leads to nerve impulses for the sense of dynamic equilibrium. The cupula is positioned within the base of the semicircular canals of the vestibular labyrinth in the inner ear. These canals contain a fluid that moves when the head rotates, bends, or the body changes its velocity. When this movement occurs, the fluid shift within the canals bends the stereocilia of the hair cells that project into the gelatinous cupula. As the stereocilia bend, they send signals via the vestibular nerve to the brain, which interprets these signals to help maintain balance and spatial orientation.