What is the function of the annular ligament?

What is the function of the annular ligament?

Structure and Function The annular ligament stabilizes the radial head within the radial notch of the ulna as it rotates during supination and pronation of the forearm.

What attaches to the tympanic membrane?

Crossing the middle-ear cavity is the short ossicular chain formed by three tiny bones that link the tympanic membrane with the oval window and inner ear. From the outside inward they are the malleus (hammer), the incus (anvil), and the stapes (stirrup).

What ligaments are in the middle ear?

The ligaments of malleus are three ligaments that attach the malleus in the middle ear. They are the anterior, lateral and superior ligaments.

What are the three layers of the tympanic membrane?

The drum membrane has three layers: the outer layer, continuous with the skin on the external canal; the inner layer, continuous with the mucous membrane lining the middle ear; and, between the two, a layer of radial and circular fibres that give the membrane its tension and stiffness.

What is the annular ligament of the elbow?

The anular ligament is in a strong band of fibers that wrap around the head of the radius and attach to the ulna, thus stabilizing the radius bone in the elbow joint. It is responsible for rotation motions of the hand, like those used to turn a key or a screwdriver.

What is unique about the structure of the annular ligament?

The annular ligament is a complex structure formed from the capsule, lateral collateral ligamentous complex, and supinator muscle that act in unison to stabilize the proximal radioulnar joint. Its posterior attachment to the ulna can be fenestrated normally.

What is the mucosal lining of tympanic membrane?

The medial aspect of the tympanic membrane is a continuation of the lining of the middle ear, which is endodermal in origin from the first pharyngeal pouch. The fibrous middle layer is derived from mesenchyme of neural crest origin and encases both the handle of the malleus and chorda tympani of the same origin.

Are there ligaments in the ear?

The most important ligament, which retains the malleus against an outward displacement, however, is the sturdy connective tissue between the cochleariform process and the malleus’ handle, enveloping the tendon of the tensor tympani muscle and crossing the middle-ear cleft together with the tendon.

Is tympanum same as tympanic membrane?

Tympanic Membrane (Tympanum) The tympanic membrane, also known as the tympanum, is an extremely thin, three-layered, semitransparent membrane peripherally suspended from the tympanic ring by a fibrocartilaginous to osseous ring.

What connects the malleus to the tympanic membrane?

The malleus connects to the tympanic membrane transferring auditory oscillations to the incus and then the stapes. The stapes connects to the oval window allowing for mechanical energy to be transferred to the fluid-filled inner ear.

What is another name for annular stapedial ligament?

For other uses, see Annular ligament (disambiguation). The annular stapedial ligament (also called the stapediovestibular joint) is a ring of fibrous soft tissue that connects the base of the stapes to the oval window of the inner ear .

What happens when the tensor tympani is contracted?

When contracted, the tensor tympani tends to pull the malleus inward and thus maintains or increases the tension of the tympanic membrane. The shorter, stouter muscle, called the stapedius, arises from the back wall of the middle-ear cavity and extends forward and attaches to the neck of the head of the stapes.

What does a healthy tympanic membrane look like?

The appearance and mobility of the tympanic membrane are important for the diagnosis of middle-ear disease, which is especially common in young children. When viewed with the otoscope, the healthy membrane is translucent and pearl-gray in colour, sometimes with a pinkish or yellowish tinge. The entire tympanic membrane consists of three layers.