IV.C.5 Head: Internal Ear Page 2 of 2

	The semicircular canals contain fluid. What is the name of the fluid, and what is its origin?
The fluid is endolymph, and it is connected to a sac in the extradural space that allows the fluid to remain at equalibrium. The endolymph is delivered to both the semicircular canals and the cochlea via the vestibular aquaduct, the utricle and the saccule.

The utricle is connected to the semicircular canals by bulges at the ends of the canals called ampullas. The ampullas have crista which sense directional changes.

The urticle's sensory organ is the macula and it senses centrifical and vertical accelleration. The saccule has a macula that senses linear acceleration.

The saccule connects directly to the cochlear duct an allows flow of endolymph to the cochlea.