What fluid is contained in the bony labyrinth?

The perilymph, which fills the space within the bony labyrinth surrounding the membranous labyrinth, is similar, but not identical, in composition to other extracellular fluids of the body, such as cerebrospinal fluid.

What are the three parts of the bony labyrinth in the inner ear?

The bony labyrinth is a complex space of three parts: the conical cochlea, the semicircular canals and the vestibule, which connects the former two parts.

Which of the following is known as cochlear duct?

A smaller scala, called the cochlear duct (scala media), lies between the larger vestibular and tympanic scalae; it is the cochlear portion of the membranous labyrinth. Filled with endolymph, the cochlear duct ends blindly at both ends—i.e., below the round window and at the apex.

What separates the scala vestibuli and the scala tympani?

The scala vestibuli and scala tympani are continuous with sound waves travelling up the vestibuli and returning through the tympani. The scala vestibuli and scala media are separated by the vestibular membrane, and the scala media and scala tympani are separated by the basilar membrane.

What is perilymph endolymph?

Endolymph is the fluid found inside the membranous labyrinth while perilymph is the fluid that surrounds the endolymph, located inside the bony labyrinth. The conversion of sound waves into the nerve impulses occurs inside the endolymph while the perilymph transforms the sound waves into the endolymph.

What is a endolymph?

Endolymph, also known as Scarpa fluid, is a clear fluid that can found in the membranous labyrinth of the inner ear. It is unique in composition compared to other extracellular fluids in the body due to its high potassium ion concentration (140 mEq/L) and low sodium ion concentration (15 mEq/L).

What is the Endolymphatic duct?

The endolymphatic duct is a small epithelial-lined channel, part of the membranous labyrinth that passes through the vestibular aqueduct in the bony labyrinth of the petrous temporal bone. It arises from the utricle and saccule via the utriculosaccule duct and drains endolymph.

What’s the difference between endolymph and perilymph?

Endolymph and perilymph vary significantly in their concentration of ions, which is essential to the overall function of the cochlea. Endolymph is rich in potassium and low in sodium and calcium, whereas perilymph is rich in sodium and low in potassium and calcium.

What is perilymph and its function?

Perilymph is the fluid contained within the bony labyrinth, surrounding and protecting the membranous labyrinth; perilymph resembles extracellular fluid in composition (sodium salts are the predominant positive electrolyte) and, via the cochlear aqueduct (sometimes referred to as the “perilymphatic duct”), is in …

What is the difference between the endolymph and perilymph quizlet?

Perilymph is located in the semicircular canals; endolymph is located in the cochlea.

What is the difference between the endolymph and perilymph?

What is perilymph made of?

The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid. The major cation in perilymph is sodium, with the values of sodium and potassium concentration in the perilymph being 138 mM and 6.9 mM, respectively. It is also named Cotunnius’ liquid and liquor cotunnii for Domenico Cotugno.

Where is perilymph and endolymph located?

Perilymph has a similar ionic composition as extracellular fluid found elsewhere in the body and fills the scalae tympani and vestibuli. Endolymph, found inside the cochlear duct (scala media), has a unique composition not found elsewhere in the body.

Where is endolymph produced?

Endolymph is produced continuously by specialized epithelial cells calledstria vascularis in one wall of the cochlear duct and in several other locations in the membranous labyrinth, using an active pumping mechanism that results in a positive electrical potential inside the membranous labyrinth.

What is the difference between endolymph and perilymph?

Definition. Endolymph refers to the fluid in the membranous labyrinth of the inner ear whereas perilymph refers to the fluid between the membranous labyrinth of the ear and the bone which encloses it.

What is the function of endolymph and perilymph?

Composition. Perilymph and endolymph have unique ionic compositions suited to their functions in regulating electrochemical impulses of hair cells necessary for hearing.