Sense of gravity is detected by
Horizontal semicircular canal
Lateral semicircular canal
Superior semicircular canal
Utricle and saccule
Utricle and saccule are stimulated by displacement of the otolithic membrane during the head tilts.They are concerned with acceleration and deceleration. (Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra; 6th edition; page no.18)
Ear