Eardrum

Your ear has a thin skin inside. It is shaped like a cone. This skin helps you hear.

Sound moves through the air. It hits the skin. The skin moves with the sound. This moves tiny bones.

These bones help you hear well. The skin can sometimes get a hole. This might make it hard to hear.

Sometimes a doctor helps the ear. They can make a tiny cut. This lets fluid out.

Most holes heal on their own. It can take a few weeks. It is a busy place in your ear.

The eardrum is a thin, cone-shaped part of your ear. It is also called the tympanic membrane. It sits between your outer ear and your middle ear.

The eardrum has a very important job. It helps you hear sounds. Sound moves through the air as pressure. This pressure hits the eardrum and makes it vibrate. These vibrations move to tiny bones in your ear. These bones are called ossicles. The vibrations then move into a fluid-filled part of the ear. This helps turn sound into something your brain can understand.

The eardrum has two main parts. One part is the pars flaccida. It is thin and fragile. The other part is the pars tensa. It is larger and stronger. It has three layers of skin and tissue.

Sometimes, the eardrum can get a hole. This is called a rupture. A rupture might happen from loud blasts or diving. It can also happen from ear infections. A hole can make it hard to hear. Most holes heal on their own in two to four weeks. Sometimes, a doctor must make a tiny cut to let fluid out. This helps relieve pressure from an infection.

The eardrum is a very important part of your ear. It is also called the tympanic membrane or the myringa. This thin, cone-shaped part sits between your outer ear and your middle ear. It helps you turn sounds from the air into signals your body can use. Without it, the vibrations in the air could not reach your inner ear. It acts like a bridge for sound to cross. This makes the eardrum vital for how humans and many other animals hear.

Sound works by changing the pressure in the air. When these pressure changes hit the eardrum, the membrane begins to vibrate. These vibrations move to the ossicles, which are tiny bones in the middle ear. One bone called the malleus connects directly to the eardrum. The malleus carries the vibration to the other bones. Then, the movement reaches the oval window in the cochlea. The cochlea is a part of the ear filled with fluid. This process turns air vibrations into vibrations in the cochlear fluid.

Doctors have studied the eardrum for a very long time. One famous book called Gray's Anatomy describes it in great detail. This book was published in 1918. Scientists also look at the nerves that provide feeling to the eardrum. The auriculotemporal nerve and the facial nerve help provide sensation to the outer surface. On the inside, the glossopharyngeal nerve provides sensation. These nerves help the body sense what is happening in the ear.

An eardrum has two main regions with different parts. The pars flaccida is a small and fragile area at the top. The larger area is called the pars tensa. This part is stronger because it has three layers of skin and tissue. The eardrum can sometimes get a hole, which is called a rupture. This can happen from loud blasts or from scuba diving. Most ruptures heal on their own in two to four weeks. However, some people might need a tiny cut called a myringotomy to help fluid drain out.

Learning about the eardrum helps us understand how we experience the world. It is similar to how a drumhead vibrates when you hit it with a stick. Just like a drum, the eardrum moves when air hits it. Some people, like the Bajau people of the Pacific, even change their eardrums on purpose. They rupture them to help them dive and hunt deep in the sea. This shows how much the ear affects how people live their lives. Understanding the ear helps us protect our hearing every day.

The eardrum is a vital part of the human auditory system. It is also known by the scientific names tympanic membrane or myringa. This thin, cone-shaped membrane sits between the external ear and the middle ear. Its primary job is to capture sound waves from the air. It then transmits those changes in air pressure to the middle ear. This process allows the ear to convert air vibrations into vibrations in the cochlear fluid. Without this membrane, the body could not properly process sound.

To understand how hearing works, we must look at the mechanical process. Sound creates changes in air pressure that hit the membrane. This causes the eardrum to vibrate. The malleus, or hammer bone, is firmly attached to the medial surface of the membrane. This bone acts as a bridge between the eardrum and the other ossicles. The ossicles are the tiny bones located inside the middle ear. These bones move the vibrations toward the oval window. The oval window is an opening into the fluid-filled cochlea. This chain reaction amplifies the vibration so the inner ear can detect it.

The structure of the eardrum is not uniform. It is divided into two distinct regions: the pars flaccida and the pars tensa. The pars flaccida is a small, relatively fragile area located at the top. It sits above the lateral process of the malleus. This region consists of two layers and often has a pinkish hue. The larger region is called the pars tensa. It is much more robust because it contains three layers. These layers include skin, fibrous tissue, and mucosa. The edge of the pars tensa is a thick ring called the annulus tympanicus. This ring is also known as Gerlach's ligament.

Specific anatomical features help define the shape of the membrane. The handle of the malleus, or manubrium, is attached to the membrane. This attachment pulls the membrane toward the tympanic cavity. Because of this pull, the lateral surface of the membrane is concave. The deepest part of this concavity is called the umbo. The membrane also sits at an oblique angle. It is positioned between several important structures. It relates to the middle cranial fossa above and the parotid gland below. It also sits near the facial nerve and the temporomandibular joint.

Because the eardrum is a sensory organ, it is supplied by several nerves. The outer surface receives sensation from the auriculotemporal nerve. This nerve is a branch of the mandibular nerve, also called cranial nerve V3. Other contributors to the outer surface include the facial nerve and the vagus nerve. The inner surface of the membrane is innervated by the glossopharyngeal nerve. This nerve is also known as cranial nerve IX. These nerves allow the body to sense various stimuli within the ear canal.

Medical professionals often examine the eardrum to check for health issues. When a doctor shines a light into the ear, they look for a specific sign. A cone of light should radiate from the tip of the malleus. This light typically reaches the periphery in the anteroinferior quadrant. Clinicians refer to this specific light pattern as the "5 o'clock" position. If the eardrum is ruptured or perforated, it can lead to conductive hearing loss. A rupture might also cause tinnitus, which is ringing in the ears, or vertigo. Vertigo is a feeling of disequilibrium or dizziness.

Injuries to the eardrum can happen in many ways. Unintentional ruptures often occur due to blast injuries or changes in air pressure during travel. This is common in people with Eustachian tube dysfunction. Such dysfunction prevents the ear from equalizing pressure. Other causes include swimming, scuba diving, or martial arts. While some ruptures are serious, many heal on their own. Between 80 and 95 percent of ruptures recover completely within two to four weeks. In some cases, doctors perform a myringotomy. This is a surgical procedure where a tiny incision is made to drain fluid or pus. This is often done to treat otitis media, a common middle ear infection in children. To prevent fluid from building up again, a tympanostomy tube may be inserted. Without a tube, the incision usually heals in two to three weeks. These tubes are either removed by a doctor or fall out naturally within 6 to 12 months.

Cultural practices can also impact the eardrum. The Bajau people of the Pacific have a unique relationship with this anatomy. They intentionally rupture their eardrums at an early age. They do this to help them with deep-sea diving and hunting. Because of these intentional ruptures, many older Bajau people have difficulty hearing. This shows how the physical state of the eardrum can change a person's way of life.