Incudostapedial Joint: Synovial joint between the incus (lenticular process of long limb) and the stapes (head).Incudomalleolar Joint: Synovial joint between the malleus (head) and incus (body).This point of connection is known as tympanostapedial syndesmosis. Its head articulates with the incus, while its base or footplate lies in the oval window of the tympanic cavity, connecting the middle ear with the inner ear. This stirrup-shaped bone has four parts – The head, base, and the anterior and posterior limbs. Stapes: The smallest of the three bones, it is located in the innermost part of the middle ear. It is also held in place by ligaments, forming two synovial joints with the other two ear bones.ģ. Incus: The incus or anvil is an anvil-shaped bone located after the malleus, consisting of a body and long and short limbs. Three ligaments hold this bone in place as it stays suspended in the anterior part of the middle ear.Ģ. ![]() The bone stays connected to the tympanic membrane or eardrum through the manubrium. It is structurally divided into several parts – the head, neck, spatulate, lateral, and anterior processes, and the manubrium (handle) of the malleus. Malleus: It is the outermost of the three bones, shaped like a hammer, hence the name (malleus is the Italian for hammer). Structure and Anatomy of the Bones in the Middle Earġ. This is where the three ear ossicles are located. ![]() The middle ear has a hollow space called the tympanic cavity, an air-filled cavity in the temporal bone’s tympanic part. Where are the Ossicles Located in the Ear These are the first bones to ossify and be fully mature at birth, so they do not grow anymore. There are three bones in each ear, so there are a total of 6 auditory ossicles in the body. The middle ear region holds the three smallest bones of the body, collectively known as auditory ossicles. There are two sets of auditory ossicles in the human body, one set in the right middle ear and one set in the left middle ear.The human ear is composed of three parts – the external/outer ear, middle ear, and internal/inner ear. VIII vestibulocochlear nerve, that carries auditory information to the brain. Auditory information in the cochlear is transferred to the cochlear nerve, part of C.N. These bones transfer the vibrations collected by the tympanic membrane to the cochlea, the specialized auditory sense organ. These bones also function to collect force and amplify sounds. If we did not have the malleus and the incus, then the vibrations of the tympanum would never reach the inner ear. ![]() In humans, the stapes is not long enough to reach the tympanum. The incus attaches the malleus to the stapes. The malleus attaches at three points to the interior surface of the tympanic membrane. The three ossicles are unique to mammals, and each plays a role in hearing. The aptly named stapes looks very much like a stirrup. ![]() Malleus, also known as the hammer, articulates with incus (the anvil), which articulates with stapes (the stirrup). The tympanic membrane (ear drum) vibrates as it receives auditory information and transfers those vibrations to three small bones in the tympanic cavity of the middle ear: malleus, incus, and stapes, often known as the auditory ossicles.Ībove: External, middle, and inner ear including the auditory ossicles. Within the external acoustic meatus of the temporal bone is the external auditory canal that carries sound into the middle ear.
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