Match the given terms in column I with its definition given in column II and choose the correct options.
$\text{Column I}$ $\text{Column II}$
$\text{(terms)}$ $\text{(definition)}$
A. semi-circular canal I. spiral organ of Corti
B. vestibule II. fluid found in the scala vestibule and scala tympani
C. cochlea III. evaluates rotational motion
D. perilymph IV. fluid found within the organ of Corti
E. endolymph V. responds to gravity and movements of the head

Semi-circular canal is interconnected tubes located inside each ear. They are lined with cilia and filled with a fluid known as endolymph. With every movement of head the endolymph moves the cilia. This works as a type of motion sensor, as the movements of the cilia are communicated to the brain. The vestibule is the central part of the osseous labyrinth and responds to gravity and movements of head. Cochlea is the auditory portion of the inner ear. It is a spiral-shaped cavity in the bony labyrinth. Perilymph is an extracellular fluid located within the cochlea (part of the inner ear) in two of its three compartments: the scala tympani and scala vestibuli. The major cation (positively charged ion) in perilymph is sodium. Endolymph is the fluid contained in the membranous labyrinth of the inner ear.