1-18 Open your notes to page 24. I will be stamping this page for questions Copy the following EQ onto a new page of notes (page 27) EQ: what is the structure and function of the inner ear?

The Inner Ear:The Vestibule The central egg-shaped cavity House equilibrium receptors

The Vestibule Figure 15.27

The Semicircular Canals Three canals Membranous semicircular ducts line each canal and communicate with part of the semicircular canal houses equilibrium receptors

The Semicircular Canals Figure 15.27

The Cochlea A spiral, conical, bony chamber: Filled with fluid Contains hair cells that move Sound organ

The Cochlea Figure 15.28

Sound and Mechanisms of Hearing Sound waves create vibrations Vibrations beat against the eardrum and ossicles The bones hit the cochlea which moves the cochlear hair cells Moving hair cells stimulates the cochlear nerve that sends impulses to the brain

Mechanisms of Equilibrium and Orientation equilibrium receptors in the semicircular canals and vestibule Maintains our orientation and balance in space Respond to gravity and changes in the position of the head Tiny hairs cells and fluid found in the vestibule and semicircular canals respond to motion As the head moves, the hairs and fluid moves

The Vestibule Figure 15.27