The Ears Essay

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The human ear is the only sensory organ that has the ability to perceive sound, this ability is referred to as hearing and also aids in maintain balance or equilibrium. The ear is divided into three main regions: the external ear, the middle ear and the internal ear. The external ear collects sound waves and channels them inwards where the middle ear conveys sound vibration to the oval window, the internal ear houses receptors for hearing and equilibrium. The external ear is the most external portion of the ear. The outer ear includes the pinna (also called auricle), the external auditory canal, and the very most superficial layer of the ear drum (also called the tympanic membrane). The pinna is a flap of elastic cartilage shaped like the flared end of a trumpet and covered by skin (Derickson, 2012, p. 658). The external auditory canal is a curved tube about an inch long that lies in the temporal bone and leads to the ear drum, the ear drum is a thin semitransparent partition between the external auditory canal and the middle ear. The ear drum is coved by epidermis and lined by simple cuboidal epithelium between the epithelial layers is connective tissue composed of collagen, elastic fibers and fibroblast. The middle ear is a small air-filled cavity in the petrous portion of the temporal bone, behind the ear drum (tympanic membrane), and includes the three smallest bones in the body or ossicles: the malleus (or hammer), incus (or anvil), and stapes (or stirrup). It is separated from the external ear by the tympanic membrane and from the internal ear by a thin body partition that contains two small membrane-covered openings: the oval window and the round window (Derickson, 2012, p. 659). The internal ear is also called the labyrinth and contains two main divisions an outer bony labyrinth that encloses an inner membranous labyrinth. The bony labyrinth is

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