Nervous System 11

Nervous System XI: In this lecture, Professor Diamond continues a review of the nervous system and covers the eye and the ear. She begins by diagramming the eye, and she differentiates between the eye itself and its accessory structures, including the bony orbit, the eyebrow and eyelids, and the conjunctiva. She describes how tarsal glands in the eyes function. Then, Professor Diamond moves on to the subject of the ear. She touches on the three divisions in the ear – outer, middle, and inner – and its equilibrium and auditory functions. She describes each division of the ear, starting with the outer. She illustrates the components of the outer ear, including the auricle, the external auditory meatus, and the glands responsible for wax production. In the middle ear, she describes the tympanic membrane and the ossicles (tiny bones), which help transmit sound, as well as the role of the Eustachian tube in equalizing pressure. In the inner ear, she discusses the vestibule, the semicircular canals, and the cochlea, and she describes how the semicircular canals and vestibule function in establishing kinetic and static equilibrium.