Diane L. M. Bick, PhD
Gartner & Hiatt, Chapter 19; Klein and McKenzie, pp319-325
Describe the structural and histological components of the outer, middle, and inner ear.
Know the components of the membranous and bony labyrinths.
Describe the structures found in the 3 scala of the inner ear.
Tympanic cavity, external auditory meatus, Eustachian tube, tympanic membrane, cupula,
organ of Corti, perilymph, endolymph, ampulla, utricle, saccule, otoconia, crista ampullaris, macula, stria
vascularis, vestibular membrane, basilar membrane, scalas.
BASIC EAR INFORMATION
Paired sensory organs that consist of the auditory system and the vestibular system.
Composed of external, middle, and inner ear.
THE THREE DIVISIONS OF THE EAR
II. EXTERNAL EAR
auricle to the
Outer one-third of wall composed of elastic cartilage that is continuous with auricle.
thirds of wall is formed by the temporal bone. Lined by stratified squamous epithelium with
hairs, sebaceous glands, and
. Secretions of sebaceous and ceruminous
glands combine to form
III. MIDDLE EAR
Consists of tympanic cavity and its components - tympanic membrane (eardrum), 3 ossicles, and
auditory or eustachian tube.
is an air-filled space.
Lined by simple squamous to low cuboidal epithelium.
Cells become ciliated and cuboidal near the
opening of the auditory tube.
Lateral wall is composed of the tympanic membrane; medial wall is shared by the inner ear.
Medial wall contains the oval window and the round window.