What is the difference between the bony labyrinth and the membranous labyrinth?
The bony labyrinth consists of the cochlea, an oval cavity called the vestibule, and the semicircular canals. The membranous labyrinth is contained within the bony labyrinth and consists of the utricle, the saccule, and the lateral, superior and posterior semicircular ducts.
What are the three subdivisions of the bony labyrinth and its membranous labyrinth structures?
Within the bony labyrinth is a membranous labyrinth, which is also divided into three parts: the semicircular ducts; two saclike structures, the saccule and utricle, located in the vestibule; and the cochlear duct, which is the only part of the inner ear involved in hearing.
What comprises the membranous versus osseous labyrinth?
Along with the cochlear duct, the membranous labyrinth is composed of the small saccule and utricle that lie within the vestibule of the osseous labyrinth, and the semicircular canals that arch outwards from the utricle.
What is meant by bony labyrinth?
: the cavity in the petrous portion of the temporal bone that contains the membranous labyrinth of the inner ear and is divided into the vestibule, cochlea, and semicircular canals. — called also osseous labyrinth.
Which is found inside the membranous labyrinth?
The component parts of the membranous labyrinth are the three semicircular ducts, each with a sense organ for rotational movement; the cochlear duct, with the sense organ for sound vibrations, and in the vestibule, the utricle and saccule, with their two sense organs for linear movement.
Is cochlea bony or membranous?
The three major parts of the bony labyrinth are the vestibule of the ear, the semicircular canals, and the cochlea. The membranous labyrinth runs inside of the bony labyrinth, and creates three parallel fluid filled spaces. The two outer are filled with perilymph and the inner with endolymph.
Where in the human body is the bony labyrinth?
The bony labyrinth is a series of bony cavities within the petrous part of the temporal bone. It consists of three parts – the cochlea, vestibule and the three semi-circular canals.
What is the function of the membranous labyrinth?
The membranous labyrinth is a collection of fluid filled tubes and chambers which contain the receptors for the senses of equilibrium and hearing.
Is Organ of Corti part of membranous labyrinth?
The basilar membrane houses the epithelial cells of hearing – the Organ of Corti. A more detailed description of the Organ of Corti is beyond the scope of this article. The saccule and utricle are two membranous sacs located in the vestibule.
Is the bony labyrinth bone?
The bony labyrinth is a series of bony cavities within the petrous part of the temporal bone. It consists of three parts – the cochlea, vestibule and the three semi-circular canals. The vestibule is the central part of the bony labyrinth.
Is the organ of Corti in the membranous labyrinth?
Membranous Labyrinth. The membranous labyrinth is a continuous system of ducts filled with endolymph. It lies within the bony labyrinth, surrounded by perilymph. The cochlear duct is situated within the cochlea and is the organ of hearing.
Is the membranous labyrinth in the inner ear?
The membranous labyrinth. The membranous labyrinth is a collection of fluid filled tubes and chambers which contain the receptors for the senses of equilibrium and hearing. It is lodged within the bony labyrinth in the inner ear and has the same general form; it is, however, considerably smaller…
What are the two branches of the membranous labyrinth?
The other branch is the vestibular nerve. Within the vestibule, the membranous labyrinth does not quite preserve the form of the bony labyrinth, but consists of two membranous sacs, the utricle, and the saccule. The membranous labyrinth is also the location for the receptor cells found in the inner ear.
Which is part of the temporal bone contains the bony labyrinth?
Bony labyrinth – consists of a series of bony cavities within the petrous part of the temporal bone. It is composed of the cochlea, vestibule and three semi-circular canals. All these structures are lined internally with periosteum and contain a fluid called perilymph. Membranous labyrinth – lies within the bony labyrinth.
Where does the membranous labyrinth supply the vestibular apparatus?
The membranous labyrinth is supplied by the labyrinthine artery, a branch of the inferior cerebellar artery (or, occasionally, the basilar artery). It divides into three branches: Cochlear branch – supplies the cochlear duct. Vestibular branches (x2) – supply the vestibular apparatus.