What does the basilar membrane do in the ear?
the basilar membrane is found in the cochlea; it forms the base of the organ of Corti, which contains sensory receptors for hearing. Movement of the basilar membrane in response to sound waves causes the depolarization of hair cells in the organ of Corti.
What happens if you damage the basilar membrane?
If the hair cells are severely damaged, they will not recover. These effects range from minor auditory fatigue to major cell death. If the hair cells and stereocilia do not have sufficient time to recover between sounds, the ear experiences auditory fatigue, which is also known as noise-induced hearing loss (NIHL).
Where is basilar membrane of the cochlea?
the inner ear
The basilar membrane is a stiff structural element within the cochlea of the inner ear which separates two liquid-filled tubes that run along the coil of the cochlea, the scala media and the scala tympani.
What are the membranes of the inner ear?
The cochlea is the auditory sense organ within the inner ear that is responsible for hearing. The cochlea is a coiled, fluid-filled tube that is split into three chambers by two membranes, Reissner’s membrane and the basilar membrane (Fig. 53-4).
What does basilar membrane look like?
The basilar membrane is a resonant structure varying systematically in width and stiffness. It is wider (0.42–0.65 mm) and more flaccid at the cochlear apex than at the base (0.08–0.16 mm). When a sound wave is transmitted to the fluid of the inner ear, the basilar membrane is set in motion.
What kind of stimulus causes the basilar membrane close to the base or oval window of the cochlea to vibrate?
Sound waves
Sound waves cause the oval and round windows at the base of the cochlea to move in opposite directions (See Figure 12.2). This causes the basilar membrane to be displaced and starts a traveling wave that sweeps from the base toward the apex of the cochlea (See Figure 12.7).
Does the basilar membrane vibrate?
The wave motion is transmitted to the endolymph inside the cochlear duct. As a result the basilar membrane vibrates, which causes the organ of Corti to move against the tectoral membrane, stimulating generation of nerve impulses to the brain.
How many hair cells are in a basilar membrane?
3500
The hair cells are arranged in two groups: a single row of about 3500inner hair cells near the edge of the osseous spiral lamina and a band of about 15,000outer hair cells three to five cells wide, directly above the flexible basilar membrane.
Is the basilar membrane part of the outer ear?
The basilar membrane is a structure within the inner ear that is moved by incoming sound waves and is essential for the sense of hearing. The ear as we see it is only the outer ear (or pinna).
What is malleus?
Definition of malleus : the outermost of a chain of three small bones of the mammalian middle ear. — called also hammer. — see ear illustration.
Which part of the malleus is attached to the tympanic membrane?
handle
Here’s the handle, or manubrium, of the malleus, attached to the tympanic membrane.
How does the basilar membrane vibrate?
The motion of the stapes against the oval window sets up waves in the fluids of the cochlea, causing the basilar membrane to vibrate. This stimulates the sensory cells of the organ of Corti, atop the basilar membrane, to send nerve impulses to the brain.