Table of Contents
- 1 What is the structure of the bony labyrinth?
- 2 What are the three structures into which the bony labyrinth is divided?
- 3 What is the function of bony labyrinth?
- 4 What is meant by bony labyrinth?
- 5 What is the function of ethmoid bone?
- 6 Is there bone between nasal cavity and brain?
- 7 What are the three parts of the bony labyrinth?
- 8 Where does the medial surface of the Labyrinth begin?
What is the structure of the bony labyrinth?
The bony labyrinth (also osseous labyrinth or otic capsule) is the rigid, bony outer wall of the inner ear in the temporal bone. It consists of three parts: the vestibule, semicircular canals, and cochlea. These are cavities hollowed out of the substance of the bone, and lined by periosteum.
What are the three structures into which the bony labyrinth is divided?
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.
What is the bony labyrinth filled with?
perilymph
All the three parts of bony labyrinth contain a fluid known as perilymph. Endolymph is present in a membranous labyrinth.
What are the cavities of ethmoidal labyrinth?
The labyrinth or lateral mass of the ethmoid bone consists of a number of thin-walled cellular cavities, the ethmoidal air cells, arranged in two groups: anterior and posterior, and interposed between two vertical plates of bone; the lateral plate forms part of the orbit, the medial, part of the corresponding nasal …
What is the function of bony labyrinth?
The cavity system of the inner ear—the so-called bony labyrinth—houses the senses of balance and hearing.
What is meant by bony labyrinth?
Medical Definition of 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.
What are the two types of labyrinth?
There are actually two labyrinths of the inner ear, one inside the other, the membranous labyrinth contained within the bony labyrinth. The bony labyrinth consists of a central chamber called the vestibule, the three semicircular canals, and the spirally coiled cochlea.
What part of the bony labyrinth is used for hearing?
cochlear duct
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 is the function of ethmoid bone?
The ethmoid bone is a cube-shaped bone located in the center of the skull between the eyes. It helps form the walls of the eye socket, or orbital cavity, as well as the roof, sides, and interior of the nasal cavity.
Is there bone between nasal cavity and brain?
The ethmoid bone (/ˈɛθmɔɪd/; from Greek ethmos, “sieve”) is an unpaired bone in the skull that separates the nasal cavity from the brain. It is located at the roof of the nose, between the two orbits. The cubical bone is lightweight due to a spongy construction.
Where in the body is the bony labyrinth?
temporal bone
The bony labyrinth, a cavity in the temporal bone, is divided into three sections: the vestibule, the semicircular canals, and the cochlea.
How is the labyrinth of the ethmoid bone formed?
Labyrinth of ethmoid. The Labyrinth or Lateral Mass of the ethmoid bone consists of a number of thin-walled cellular cavities, the ethmoidal cells, arranged in three groups, anterior, middle, and posterior, and interposed between two vertical plates of bone; the lateral plate forms part of the orbit, the medial plate forms part…
What are the three parts of the bony labyrinth?
The bony labyrinth is composed of three parts: 1 vestibule, 2 semicircular canals (3), 3 cochlea. More
Where does the medial surface of the Labyrinth begin?
The medial surface of the labyrinth forms part of the lateral wall of the corresponding nasal cavity. It consists of a thin lamella, which descends from the under surface of the cribriform plate, and ends below in a free, convoluted margin, the middle nasal concha.
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.